 ... from this reasoning, that if we throw a greater quantity of light upon an object, so that more may be collected by the object-glass, we shall be the better able to define its structure ; which would probably be the case if the additional light could...  The American Journal of Science - Pàgina 2201854Visualització completa - Sobre aquest llibre
 | 1839 - 504 pàgines
...which would probably be the case if the additional light could be thrown only upon those minute parts which we wish to examine, and not upon the whole object....the relative proportions of light which proceed from these minute parts, the intended advantage will not be derived." Mr. Pritchard mentions a curious "... | |
 | 1839 - 938 pàgines
...which would probably be the case if the additional light could be thrown only upon those minute parts which we wish to examine, and not upon the whole object....the relative proportions of light which proceed from these minute parts, the intended advantage will not be derived." Mr. Pritchard mentions a curious "... | |
 | Perry Fairfax Nursey - 1839 - 508 pàgines
...which would probably be the case if the additional light could be thrown only upon those minute parts which we wish to examine, and not upon the whole object....illumination cannot be made to increase the relative proportion» of light which proceed from these minute parts, the intended advantage will not be derived."... | |
 | John Quekett - 1848 - 544 pàgines
...which would probably be the case if the additional light could be thrown only upon those minute parts which we wish to examine, and not upon the whole object....the relative proportions of light which proceed from these minute parts, the intended advantage will not be derived." Having now pointed out the importance... | |
 | Joseph Henry Wythe - 1851 - 204 pàgines
...structure; and this would probably be the case if we could throw light only upon those minute parts which we wish to examine, and not upon the whole object, but as we cannot increase the relative proportions of light; the advantages proposed cannot be derived. In examining... | |
 | Joseph Henry Wythe - 1852 - 208 pàgines
...structure; and this would probably be the case if we could throw light only upon those minute parts which we wish to examine, and not upon the whole object, but as we cannot increase the relative proportions of light, the advantages proposed cannot be derived. In examining... | |
 | Jonathan Pereira - 1854 - 384 pàgines
...squares of their diameters. Increase of illumination cannot compensate for deficiency of aperture. It cannot be made to increase the relative proportions of light which proceed from these minute parts. IMPERFECTION OF MICROSCOPES, AND MEANS > OF CORRECTION. The causes of imperfection... | |
 | John Quekett - 1855 - 1022 pàgines
...could be thrown only upon those minute parts which we wish to examine, and not upon Fig. 288. Fig. 289. the whole object. But as we cannot do this, as the...the relative proportions of light which proceed from these minute parts, the intended advantage will not be derived." Having now pointed out the importance... | |
 | 1854 - 956 pàgines
...Microscope than that of Mr. Pritchard in his " Microscopic Illustrations," which is copied by Mr. duekett. After explaining that since the whole diameter of...regard to using Microscopes successfully. The second senlence'says in effect, that when, with an object-L'lass of small aperture, and in a faint liuht,... | |
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