| 单词 | principal axis |
| 例句 | Dihexagonal prism, consisting of twelve faces parallel to the principal axis and inclined to the planes of symmetry. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z The axis which contains the foci is called the principal axis; in case of an hyperbola it is the axis which cuts the curve, because the foci lie within the conic. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z By means of clockwork the instrument is given such a motion round its principal axis that the star is kept stationary in the field of view. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z The telescope, in order that it may be pointed in any direction, must admit of two motions, one round the principal axis, and the other round an axis at right angles to it. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" Benzoic acid is pseudo-tetragonal, the principal axis being remarkably long; there is no cleavage at right angles to this axis. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" This consists of a single pair of parallel faces perpendicular to the principal axis. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z They will therefore cut the principal axis in two points, which are conjugate in the involution considered in � 84; hence they are harmonic conjugates with regard to the foci. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z To Babylonia is due the practice of the orientation of temples; that is to say, the arrangement of the building in such a way that its principal axis shall point exactly in a desired direction. History of Religion A Sketch of Primitive Religious Beliefs and Practices, and of the Origin and Character of the Great Systems Thus at the earliest epoch the principal axis of the island had its direction from the north-west to the south-east. Rambles in the Islands of Corsica and Sardinia with Notices of their History, Antiquities, and Present Condition. I also desired to have a rotation of nearly 180° about the principal axis. Scientific American Supplement, No. 365, December 30, 1882 Here there is only a single dyad axis of symmetry, which coincides with the principal axis. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z To determine this ratio we consider its value for a vertex on the principal axis. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z The axis which contains the foci is called the principal axis, and the intersection of the axis with the curve is called the vertex of the curve. An Elementary Course in Synthetic Projective Geometry When a pendulum deviates from the vertical, the action of gravity brings it back; when the principal axis of the moon recedes from its usual direction, the earth in like manner compels it to return. Biographies of Distinguished Scientific Men The ray AC, parallel to the principal axis, will pass through the lens and emerge as DE. General Science Thus, in tourmaline the ordinary ray, which vibrates perpendicular to the principal axis, is almost completely absorbed, whilst the extraordinary ray is allowed to pass through the crystal. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z This constant sum or difference equals in both cases the length of the principal axis. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Find the foci and the length of the principal axis of the conics in problems 9 and 10. An Elementary Course in Synthetic Projective Geometry The ends of the prism are perpendicular to its length; the section carried through it is in a plane perpendicular to the principal axis of the crystal. Scientific American Supplement, No. 441, June 14, 1884. It will be seen from the figure how the principal axis of the instrument rests upon the two masonry pillars, one of which is 49 ft. and the other 13 ft. in height. Scientific American Supplement, No. 803, May 23, 1891 They are inclined to one another at equal oblique angles, and they are all equally inclined to the principal axis; further, they are all of equal length and are interchangeable. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z On this floor there were also four smaller rooms used as commissioners' headquarters, manager's office, post-office, and lady manager's headquarters; also wide hallways at right angles to the principal axis of the building. Final Report of the Louisiana Purchase Exposition Commission It is the parameter of the principal axis. The Gutenberg Webster's Unabridged Dictionary Section I, J, K, and L The end surfaces and also the cut carried through the prism are parallel to the principal axis of the calc-spar. Scientific American Supplement, No. 441, June 14, 1884. In uniaxial crystals there are two principal coefficients of expansion; the one measured in the direction of the principal axis may be either greater or less than that measured in directions perpendicular to this axis. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z In crystals of this division of the hexagonal system the principal axis is a hexad axis of symmetry. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z Which of these two directions is taken by the axis depends on whether the crystal is paramagnetic or diamagnetic, and on whether the principal axis is the direction of maximum or minimum magnetization. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z The phenomenon was first observed in crystals of tourmaline, the principal axis of which is a uniterminal triad axis of symmetry. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z Thus increasing pressure along the principal axis of a tourmaline crystal produces the same electric charges as decreasing temperature. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z |
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