Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 82American Philosophical Society, 1940 |
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Сторінка 272
... Field . Many observers use Helmholtz coils which fit closely around the chamber and also place the coils closer together than called for in the classical design , to increase the field . To minimize inhomogeneity , we used the Helmholtz ...
... Field . Many observers use Helmholtz coils which fit closely around the chamber and also place the coils closer together than called for in the classical design , to increase the field . To minimize inhomogeneity , we used the Helmholtz ...
Сторінка 339
... field . Distortion , unimportant for astro- nomical purposes , is small ; for one member of the family distortion is zero . Each member of this family of cameras is equivalent in optical performance to the Schmidt camera . The tube ...
... field . Distortion , unimportant for astro- nomical purposes , is small ; for one member of the family distortion is zero . Each member of this family of cameras is equivalent in optical performance to the Schmidt camera . The tube ...
Сторінка 345
... field , and light efficiency . Accord- ingly , the apertures of the new types are slightly increased over the Schmidt in order to compensate for the loss of light by the second mirror in the system . Each of the cameras in Fig . 2 is an ...
... field , and light efficiency . Accord- ingly , the apertures of the new types are slightly increased over the Schmidt in order to compensate for the loss of light by the second mirror in the system . Each of the cameras in Fig . 2 is an ...
Зміст
and Finance C R WHITTLESEY | 73 |
Discussion of Totalitarianism HERBERT HEATON | 89 |
Blaise de Vigenère and the Chiffre Carré CHARLES | 102 |
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