| 单词 | assayer |
| 例句 | Some of the old mining buildings are still visible in trails in Great Falls Park, and the oldest house in Potomac Falls, built in the late 1800s, was known as the assayer’s office. In woodsy Potomac Falls, tranquility and neighborliness at an upscale price 2020-10-06T04:00:00Z The King is played in the film by Michael Shannon, a frequent assayer of the quirky and the offbeat in movies. ‘Elvis & Nixon’ director Liza Johnson wanted to honor Presley’s legacy 2016-04-19T04:00:00Z As a precaution against murder, assayers of food, drink, etc., were appointed. The Doctor in History, Literature, Folk-Lore, Etc. 2012-04-25T02:01:14.613Z The assayer, however, set out for the new Eldorado and lost his life, probably murdered by the Bedawin. The Contemporary Review, Volume 36, October 1879 2012-04-18T02:00:17.060Z Victor W. S., a practical miner, assayer and mining expert, who has been engaged in developing gold and silver mines. Blazing The Way True Stories, Songs and Sketches of Puget Sound 2012-04-03T02:00:30.677Z The first volume will be a Manual on the Art of Assaying Precious Metals, and will be found valuable not only to the amateur, but to the assayer, metallurgist, chemist, and miner. Froth 2011-12-28T03:00:38.123Z The statement sometimes made that Agricola was the first assayer, is false if for no other reason than that science does not develop with such strides at any one human hand. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z In a royal household the physician acted as assayer. The Doctor in History, Literature, Folk-Lore, Etc. 2012-04-25T02:01:14.613Z Upon his return to England, Frobisher took back a large stone, which an assayer claimed contained gold. The Colonization of North America 1492-1783 2011-07-06T02:00:47.077Z And according to the assayers the new vein Cox discovered will mill as high as two hundred dollars to the ton of ore. Ruth Fielding at Silver Ranch Schoolgirls Among Cowboys 2011-06-14T02:00:23.130Z “And take these specimens of ore to the assayer,” put in Ruth. Ruth Fielding In the Saddle College Girls in the Land of Gold 2011-06-14T02:00:22.083Z The lees of wine were the crude tartar or argols of commerce and modern assayers. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z We give an illustration, reproduced from an ancient manuscript, of an assayer tasting wine. The Doctor in History, Literature, Folk-Lore, Etc. 2012-04-25T02:01:14.613Z A quantity of stuff is in the hands of expert assayers at the present time, and we are awaiting their report. The Squire's Daughter 2011-06-13T02:00:25.710Z He seems to have an assayer’s report among his papers that promises big returns on some specimens he had assayed. Ruth Fielding at Silver Ranch Schoolgirls Among Cowboys 2011-06-14T02:00:23.130Z Not even Miss Cullam knew that the report had come from the assayer regarding the first specimen of ore the girls had found. Ruth Fielding In the Saddle College Girls in the Land of Gold 2011-06-14T02:00:22.083Z Inasmuch as the assayers themselves make the cupels, something must be said about the material from which they are made, and the method of making them. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z This ceremony had to be performed in the presence of an assayer. The Doctor in History, Literature, Folk-Lore, Etc. 2012-04-25T02:01:14.613Z In that tense moment, however, Mr. William Thornton, assayer and metallurgist, had done an amount of thinking that would have required many minutes of his leisure. The Mystery of The Barranca 2011-05-25T02:00:16.720Z “Here are three certificates from assayers recommended to us as the best in San Francisco.” The Squatter and the Don 2011-03-27T02:00:13.400Z Tom had returned before this with reports from the assayer and copies of the filing of the claims. Ruth Fielding In the Saddle College Girls in the Land of Gold 2011-06-14T02:00:22.083Z In this place I ought not to omit mention of another method of assaying employed by some assayers. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Do you not know that it is at Rapid, in the School of Mines, that the nearest assayer is? The Westerners 2011-02-14T03:00:39.347Z The assayer was positive it was strontianite and not merely barytes?” The Mesa Trail 2011-01-27T03:00:37.207Z An assayer was sent from Spain to superintend the refining of the copper from the ore, and suitable works were erected. The History of Cuba, vol. 1 She certainly had quite forgotten the specimens of ore which had been sent to the Handy Gulch assayer’s office until unexpectedly the report arrived. Ruth Fielding In the Saddle College Girls in the Land of Gold 2011-06-14T02:00:22.083Z Turning, he smiled back at the little assayer. Stepsons of Light It's in too deep for that, and they could hardly hope to fool the assayer that way. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son One o' them, wonderin' what the black rock might be, an' havin' a hunch it might be lead it was so heavy, put a chunk in the hands of an assayer in Placerville. The Boy With the U.S. Miners Although an ounce of "clean" gold will average at the assayer's from eighteen to nineteen dollars, sixteen dollars is, in Alaska, the accepted current value. The Land of Nome A narrative sketch of the rush to our Bering Sea gold-fields, the country, its mines and its people, and the history of a great conspiracy (1900-1901) The bars of gold are stamped with a trade-mark, and pieces are cut off each ingot to be sent to the assayer for his report. Old and New London Volume I He had given her his advice, which was not to sell, and–oh, 88 that accursed assayer! Shadow Mountain "Seeing isn't always believing, when it comes to mines," replied the assayer. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son “My name is Denver Russell and I’m taking this up to the assayer.” Silver and Gold A Story of Luck and Love in a Western Mining Camp We dined, or not to take that word in vain, we ate after a fashion, in the nightmare disorder of the assayer’s office, perched among boxes. The Works of Robert Louis Stevenson - Swanston Edition Vol. 2 (of 25) Why do you wish me to be the assayer?” Daddy's Girl The mail that night bore a sample of white quartz to a custom assayer in Vegas, but Virginia guarded her secret well. Shadow Mountain The government assayer, he knew, would tell the truth about the value of it. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son Somehow he and his partners had discovered a lost Spanish mine and did not know its value on account of some trickery of an assayer. Where Strongest Tide Winds Blew Later he showed them to an assayer somewhere up on the Gila and learned their richness. When the West Was Young He was the most trusted and eminent mine assayer in London, and had before now done useful work for Grayleigh, who was chairman of several other companies. Daddy's Girl Virginia paced the floor in a very unloverlike mood; and at last she sat down and wrote a scathing letter to the assayer, demanding her assay at once. Shadow Mountain He got the address of the assayer from the hotel proprietor, and was soon at the official's office. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son I was going to Saguache to see Mr. Amos, the assayer, to have him test a jug handle,––er, that is, to have the jug handle test him. Where Strongest Tide Winds Blew The staff had its headquarters in Tientsin, where were also the principal laboratories for the mineralogists, assayers, and chemists. Herbert Hoover The Man and His Work Accustomed as most of these men were to assayers’ reports, what they now listened to unfeignedly astonished them. Daddy's Girl And then to cap it all that miserable assayer sent in his belated report. Shadow Mountain "So you want some of this Hop Toad, and Dolphin ore tested, eh?" inquired the assayer. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son For all that, assayers were generally honest and skillful. Partners of the Out-Trail On that point the doubt was settled by sending the samples to an assayer, and his report left nothing to be desired. Louisiana Lou A Western Story His report as assayer will save the situation; that is, if it is first-rate. Daddy's Girl It is in the very heart of the richest mining zone in the world, if the assayers are to be believed. Arizona's Yesterday Being the Narrative of John H. Cady, Pioneer He would take to a government assayer the ore he and his companions had received, and learn whether the mine was or was not a good one. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son That young assayer Russell started to bulldoze when Sandy took a hand. Rimrock Trail Before the assayer’s report had been received there were prospectors hurrying into the Esmeraldas and raking Shoestring Cañon and the environs. Louisiana Lou A Western Story Before the English assayers confirmed his judgment as to the value of this cargo, the intrepid adventurer had sailed, with fourteen others, up the Chesapeake into new and wonderful regions. Great Men and Famous Women. Vol. 5 A series of pen and pencil sketches of the lives of more than 200 of the most prominent personages in History We had at one time an assayer in our camp, who obtained such rich results from every specimen of rock brought to him, that he soon had a virtual monopoly of the business. Seven and Nine years Among the Camanches and Apaches An Autobiography You see we assayers have to take the word of the miners as to where the ore comes from. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son Sandy introduced Sam as his partner, Westlake as a mining engineer and assayer. Rimrock Trail You see, an assayer we took them to found that they were rich in lead and silver.” Prescott of Saskatchewan A half an hour of conversation with those mysterious "owners," the disclosure of his maps, photographs, ore samples, the report of the assayers, etc., and then, the final arrangements. The Silver Butterfly For this purpose it is customary to select the richest lump you can find, and take it to the assayer. Seven and Nine years Among the Camanches and Apaches An Autobiography As he and his chums left the assayer's office they met Tim, who had returned to the hotel, and, on inquiring, had learned where they had gone. Dick Hamilton's Fortune The Stirring Doings of a Millionaire's Son Guffaws suddenly rose from the little crowd by the assayer's sign. Rimrock Trail I ain’t never been able to get any of that gold to the assayer. 'Drag' Harlan The assayer took it, looked it over, and asked if we wanted it assayed for iron. The History of Minnesota and Tales of the Frontier Out of the return of the twenty assayers of the different smelters, probably not a half per cent. of difference will be found in their estimates of the produce. Chambers's Edinburgh Journal, No. 458 Volume 18, New Series, October 9, 1852 The attorney understood Jack to say that he was going to an assayer's office, and the young woman learned there that he had not been seen yet by the assayer. The Highgrader The bully obeyed him, standing at the door in the place of the assayer, who stepped aside, feeling a little sick at the stomach, Sam bracing him in friendly fashion by one elbow. Rimrock Trail “The assayer used names that didn’t mean anything to me, but he told me enough in plain talk, to prove that your dad wasted his time.” 'Drag' Harlan "Give him the position of assayer in charge." At the Time Appointed He was a person of some consequence once—a rather famous assayer and mineralogist—and I think he felt it.” The Gold Trail The assayer tried our ore again and again and found it very rich, but when we shipped to the mills we got almost no returns. The Spirit of Sweetwater Sam followed with the assayer who now began to realize that Sandy's interference had established a friendship that would continue protective. Rimrock Trail One of these days we shall have to appoint an assayer of consciences at the Mint. Napoleon the Little The assayer and himself at once exchanged places, and, unheeding the many eyes fixed upon him, Darrell seated himself before the long table and deftly began operations. At the Time Appointed I was once Professor of—mineralogical chemist and famous assayer too. The Gold Trail So the culprits enjoyed the girls' scare, and retired to the water-tank behind the assayer's office to hatch up some new scheme. Tabitha's Vacation The assayer, bewildered at Sandy's assumption of friendship, waved his hand deprecatingly. Rimrock Trail Then I take their specimens and I put 'em over the hurdles,—and half the time they go out wishing there was n't any such person in the world as an assayer. The Cross-Cut As a result, Darrell had scarcely reopened business at his former quarters before he found himself with numerous eastern commissions to be executed, in addition to his old work as assayer. At the Time Appointed “It can show those who remember him as he was that Grenfell the assayer and mineralogist can still look round a mineral basin and tell just where the gold should be.” The Gold Trail "Well," said the assayer, shaking his gray head in a puzzled fashion, "I don't understand how you kids work the stunt." Tabitha's Vacation The young assayer had no holster to his belt, seemingly no gun. Rimrock Trail Glowing words told of the possibilities of the Silver Queen, the assayer's report was reproduced on a special cut which evidently had been made in Denver and sent to Ohadi by rush delivery. The Cross-Cut They went to the assay house, where the diamond drill cores showed the ore from the heart of the hills; and there at last Rimrock found his tongue as he ran over the assayer's reports. Rimrock Jones The man, it seemed, had been a famous assayer, and now the one capability which was of any use to him was that of neatly mending holes in worn-out garments. The Gold Trail The children lifted questioning eyes to Tabitha's crimson face, and even the assayer looked down at her curiously. Tabitha's Vacation At his back was only the unarmed assayer. Rimrock Trail There were many questions to come crowding in, but I could scarcely expect the assayer's daughter to answer them. Branded So too will solid gold wondrously gleam and shine out in the assayer’s fire. Selections from the Writings of ‘Abdu’l-Bahá Among the sufferers is the venerable Dr. Jameson, a distinguished foreigner, who has served this country faithfully for forty years, first as assayer, then as director of the mint, and always by his scientific position. The Andes and the Amazon Across the Continent of South America The assayer's eyes grew thoughtful, as he examined each coin minutely, and counted the treasure, to make sure that Tabitha's figures were right. Tabitha's Vacation There's a young assayer come in last night. Rimrock Trail Also, I wondered how her bookish, studious father had ever contrived to break with the scholastic traditions sufficiently to become an assayer for a Western mine. Branded Most assayers, however, using a micrometer in this way, would like to know its absolute value. A Text-book of Assaying: For the Use of Those Connected with Mines. There was an old assayer whom the golems had described to him before his first trip to town. Someone Comes to Town, Someone Leaves Town "Go for the assayer," she commanded hoarsely, seizing the heavy rope with both hands, and preparing to descend as Toady had done. Tabitha's Vacation The result was the "Pallas" was chartered to carry out the machinery, some mill-wrights, a couple of engineers, a couple of mill workers, an assayer, and any miscellaneous freight that Sedgwick might desire to send. The Wedge of Gold I gave my two partners the gist of the conversation with the assayer, briefly and without comment. Branded It is more than probable that in practice the returns from the dressing-floors check the assayer, instead of, as should properly be the case, the assayer checking the returns. A Text-book of Assaying: For the Use of Those Connected with Mines. “Want a milkshake?” he asked, mentally totting up the cash in his pocket and thinking that he should probably send Brad to dicker with the assayer again soon. Someone Comes to Town, Someone Leaves Town "The assayer will be wanting his horses to-day and it's too far to walk." Tabitha's Vacation We shall be glad to receive the assayer you hope to procure, as soon as possible, for we cannot get one in this country equal to the business in all its parts. Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson, Volume 3 He is the best, or at least one of the best, metallurgical chemists in the district, and it goes without saying that an honest assayer counts for everything in this mining game. Branded Cupels do not bear transport well; hence the assayer generally has to make them, or to supervise their making. A Text-book of Assaying: For the Use of Those Connected with Mines. As he walked away from the assayer's shop he felt his hands absolutely empty. The Furnace of Gold "Wouldn't it be wiser to tell the assayer and get him to help?" Tabitha's Vacation Under him are a treasurer, an assayer, a chief coiner, an engraver, and a melter and refiner. The Government Class Book Designed for the Instruction of Youth in the Principles of Constitutional Government and the Rights and Duties of Citizens. He crossed the arroyo, and went to the cabin which had once been the office of the assayer. Heart's Desire Laboratory Books and Report Forms.—The record which the assayer makes of his work must be clear and neat, so that reference, even after an interval of years, should be certain and easy. A Text-book of Assaying: For the Use of Those Connected with Mines. "Be good," said Van, and off he went to the assayer's shop for which he had started before. The Furnace of Gold I spoke up sharp; but I was feelin' pretty sick, for I just remembered that we didn't register that sample when we mailed it to the assayer. Copper Streak Trail The finished product will pass current with the most exacting of assayers, as well as gladden the hearts of the poor one whose hand seldom touches gold. The Influence of Old Norse Literature on English Literature Assayer: Item, an assayer, for we are in much need of one. The Philippine Islands, 1493-1803 — Volume 03 of 55 1569-1576 Explorations by Early Navigators, Descriptions of the Islands and Their Peoples, Their History and Records of the Catholic Missions, as Related in Contemporaneous Books and Manuscripts, Showing the Political, Economic, Commercial and Religious Conditions of Those Islands from Their Earliest Relations with European Nations to the Beginning of the Nineteenth Century If the degree of accuracy attainable with the methods and instruments at the assayer's service is known, it is easy to calculate what quantity should be taken for any particular case. A Text-book of Assaying: For the Use of Those Connected with Mines. "Sorry, old man," said the assayer, as before. The Furnace of Gold I got to the railroad I wired that assayer right off. Copper Streak Trail The offices include those of secretaries, notaries, alguazils, clerks of records, assayer, and any others whatever. The Philippine Islands, 1493-1898 — Volume 06 of 55 1583-1588 Explorations by Early Navigators, Descriptions of the Islands and Their Peoples, Their History and Records of the Catholic Missions, as Related in Contemporaneous Books and Manuscripts, Showing the Political, Economic, Commercial and Religious Conditions of Those Islands from Their Earliest Relations with European Nations to the Close of the Nineteenth Century Tisco was a graduate of a university at the capital City of Mexico, a doctor of philosophy, no mean chemist, a clever assayer of precious metals and an engineer. The Young Engineers in Mexico Or, Fighting the Mine Swindlers In fact, assaying is becoming wider in its scope, and the distinction between "assayers" and "analysts" will in time be difficult to detect. A Text-book of Assaying: For the Use of Those Connected with Mines. Miners with outfits, gamblers with their paraphernalia, saloon men with case on case of liquors, assayers, lawyers, teamsters, cooks—even a half dozen women—comprised the heterogeneous army making ready for the charge. The Furnace of Gold After a reasonable time we should make some casual mention of discontent that we've sent off rock to an assayer and not heard from it. Copper Streak Trail In the bottom of each was found a tiny bead of half-lustrous metal, which miners and assayers term the "button." The Young Engineers in Nevada Or, Seeking Fortune on the Turn of a Pick In a grip which he carried were a number of sacks, which he supposed contained gold dust, but held only taulk on its way to assayers in Denver. Cattle Brands A Collection of Western Camp-fire Stories We have endeavoured rather to give what will be of use to the assayer than to cover the ground within the limits of a faulty definition. A Text-book of Assaying: For the Use of Those Connected with Mines. In the same way the nummularii, or assayers of the coin, having a mass of it in their hands, would tend to develop a private business as well as their official public one. Social life at Rome in the Age of Cicero "Will he take the first steps on your bare word—without even a sample or an assayer's report?" Copper Streak Trail One does not hasten to apply the assayer's acid to treasure trove. Mary Wollaston The lower room had been the assayer’s office. The Silverado Squatters Such experiments are often made by assayers, but seldom recorded. A Text-book of Assaying: For the Use of Those Connected with Mines. And I guarantee that in my system collection shall be easy: no comptrollers, assessors, tasters, assayers, inspectors, receivers; no watching, no office expenses; not the smallest annoyance or the slightest indiscretion; no constraint whatever. System of Economical Contradictions; or, the Philosophy of Misery Bromide of Gold--Is readily prepared by adding a little bromide to the brown gold of the assayers, and allowing it to remain some time under water, or assisting its action by a gentle heat. American Hand Book of the Daguerreotype One always brings back something—frost-bite, bruises, a bag of specimens that assayers and mineral development men smile at. Vane of the Timberlands To these were added in 1438 the year letter or assayer’s mark, a different letter being chosen for each year. English Villages The pump is only used in exceptional cases; nearly all the filtrations required by the assayer can be made without it. A Text-book of Assaying: For the Use of Those Connected with Mines. Nothing now remains but to weigh it; then the proportions of the several metals contained in the brick are known, and the assayer stamps the value of the brick upon its surface. Roughing It, Part 4. I do not think our expert, Buck, would salt an assayer's kit, but he was charged with it at this time, and he said he would rather lose his trade than have trouble over it. Remarks But crude ore brought to light by our own pick and shovel is more precious to us than refined gold that enters into circulation through the assayer and the mint. Under the Skylights Had the assayer at Alexandria played him a trick ? The Land of Midian — Volume 1 The assayer connected with mining has generally two classes of material to deal with: those comparatively rich and those comparatively poor. A Text-book of Assaying: For the Use of Those Connected with Mines. One assayer got such rich results out of all specimens brought to him that in time he acquired almost a monopoly of the business. Roughing It, Part 4. But we never got the money, for when the assayer got home he casually assayed his apparatus and found that his whole outfit had been salted prior to the Aladdin assay. Remarks While the homely assayer thus spoke, he was making his preparations. Warlock o' Glenwarlock The assayer brought into view a shot-gun, while the cashier and clerks armed themselves. The Spoilers The details of the process are slightly varied by different assayers: the following will be good practice for the student. A Text-book of Assaying: For the Use of Those Connected with Mines. The other assayers entered into a conspiracy against him, and let some prominent citizens into the secret in order to show that they meant fairly. Roughing It, Part 4. I sent a piece of the cropping to a man over in Salt Lake, who is a good assayer and quite a scientist, if he would brace up and avoid humor. Remarks A young Jew, Nathan, issued from Levi's tent with a rough table and two or three pair of scales and other paraphernalia of a gold assayer and merchant. It Is Never Too Late to Mend The assayer is busy, and I walk back into his room, and while I'm there in trots McNamara in a hurry. The Spoilers Some assayers advise cleaning by dipping in warm dilute hydrochloric acid followed by washing in water and drying. A Text-book of Assaying: For the Use of Those Connected with Mines. Due publication of the whole matter was made in the paper, and the popular assayer left town "between two days." Roughing It, Part 4. When we got down sixty feet I sent some pieces of the pay streak to the assayer again. Remarks After fooling with those assayers a week, they concluded not to buy "Mr. Flower" at $50, although they would have given five times the sum for it four months ago. Mark Twain's Letters — Volume 1 (1835-1866) Bud started out next day with three different samples for the assayer, and an air castle or two to keep him company. Cabin Fever A sample of 2 or 3 lbs. is sent to the assayer. A Text-book of Assaying: For the Use of Those Connected with Mines. A button or globule of perfectly pure gold and silver is left behind, and by weighing it and noting the loss, the assayer knows the proportion of base metal the brick contains. Roughing It, Part 4. Some assayers cover their pots with a flat cover placed loosely on, while others leave the mixture in the open pot. A Text-book of Assaying: For the Use of Those Connected with Mines. Some assayers use a little powdered fluor-spar to assist the fusion of refractory slags. A Text-book of Assaying: For the Use of Those Connected with Mines. He went to the pest office and inquired for mail, got what proved to be the assayer's report, and went on. Cabin Fever The former are pale coloured and of little importance to the assayer. A Text-book of Assaying: For the Use of Those Connected with Mines. Burettes may be fixed in any convenient stand; they must be vertical and should be so placed that the assayer can read any part of the graduated scale without straining. A Text-book of Assaying: For the Use of Those Connected with Mines. It only forms one family of salts, and of these the chloride and nitrate are of chief importance to the assayer. A Text-book of Assaying: For the Use of Those Connected with Mines. It is the best acid for dissolving metallic oxides and carbonates, and is always used by the assayer when oxidising agents are to be avoided. A Text-book of Assaying: For the Use of Those Connected with Mines. Cash looked slightingly down at the assayer's report. Cabin Fever The older assayers, therefore, added silver to their gold in such proportion that the alloy for parting should be one quarter gold to three quarters silver. A Text-book of Assaying: For the Use of Those Connected with Mines. In estimating minute quantities of gold there are one or two points, of importance to an assayer only in this assay, where they will often allow one to avoid the working of inconveniently large charges. A Text-book of Assaying: For the Use of Those Connected with Mines. Properly, however, this work should be done by the assayer, if only for the following reason. A Text-book of Assaying: For the Use of Those Connected with Mines. The assayer, as a rule, can select his own standard temperature, and may choose one which will always necessitate warming. A Text-book of Assaying: For the Use of Those Connected with Mines. It is assumed that the dry ore of the sampler and of the assayer are the same thing; according to the nature of the ore, this may or may not be the case. A Text-book of Assaying: For the Use of Those Connected with Mines. The dry assayers who do this are in most cases helped, and sometimes, perhaps, controlled, by wet assays made for one or both of the parties in the transaction. A Text-book of Assaying: For the Use of Those Connected with Mines. Cornish dry assayer very seldom makes a moisture determination. A Text-book of Assaying: For the Use of Those Connected with Mines. It is a gas, present everywhere, but so inactive that the assayer can always afford to ignore its presence, and, except in testing furnace gases, &c., he is never called on to determine its quantity. A Text-book of Assaying: For the Use of Those Connected with Mines. It is a common practice with assayers to carry the first attack of the sample with acids to dryness, and to take up with a fresh portion of acid. A Text-book of Assaying: For the Use of Those Connected with Mines. Only in the case of the analysis of this and similar substances is the assayer called on to report the percentage of silicon. A Text-book of Assaying: For the Use of Those Connected with Mines. Many assayers use flasks, though of a smaller size, for the ordinary partings in assaying gold ores. A Text-book of Assaying: For the Use of Those Connected with Mines. Ammonia hardly comes within the objects of assaying; but it is largely used in the laboratory, and the assayer is not unfrequently called on to determine it. A Text-book of Assaying: For the Use of Those Connected with Mines. Compounds of barium are often used by the assayer, more especially the chloride and hydrate. A Text-book of Assaying: For the Use of Those Connected with Mines. Distilled water is only used by assayers in certain exceptional cases, so that by many it would be classed among the rarer oxides. A Text-book of Assaying: For the Use of Those Connected with Mines. Sulphites are of little importance to the assayer, and are converted into sulphates by the action of nitric acid and other oxidising agents. A Text-book of Assaying: For the Use of Those Connected with Mines. Those ores which generally come under the notice of the assayer are fairly rich in zinc; but alloys and metallurgical products contain it in very varying proportions. A Text-book of Assaying: For the Use of Those Connected with Mines. Some "assayers" use both tartar and nitre, the former of course being in excess. A Text-book of Assaying: For the Use of Those Connected with Mines. The assayer has only to take account of the organic matter when it is of commercial importance, so that in assays it is generally included under "loss on ignition." A Text-book of Assaying: For the Use of Those Connected with Mines. The assayer seldom requires these compounds to be in solution. A Text-book of Assaying: For the Use of Those Connected with Mines. Phosphorus and arsenic closely resemble each other in their chemical properties, more especially those which the assayer makes use of for their determination. A Text-book of Assaying: For the Use of Those Connected with Mines. |
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