| 单词 | centre of curvature |
| 例句 | The distance from P to the centre of curvature is the radius of curvature. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Both arms of the beam carry circular-arched heads, which are similar portions of the complete circles, the centre of curvature being the fulcrum, or axis. A Treatise on Meteorological Instruments Explanatory of Their Scientific Principles, Method of Construction, and Practical Utility 2011-06-19T02:00:15.717Z On the side of the beam towards the centre of curvature the longitudinal filaments must be contracted, and on the other side they must be extended. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z These reflectors should be spherical and so adjusted that the radiant is in the centre of curvature, thus ensuring that the light from the reflector passes again through the original source. Optical Projection Part 1: Projection of Lantern Slides For instance, if the radius of curvature of the cathode be 1.5 inches, the centre of curvature may lie something like an eighth of an inch or less in front of the anode. On Laboratory Arts It is an application of the principle of having the cutting tool as long as the radius of curvature, and allowing it to move about the centre of curvature. On Laboratory Arts The source and screen are partly independent, and each is provided with a fine adjustment which serves to place it in position near the centre of curvature. On Laboratory Arts |
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