 | William Benjamin Carpenter, William Henry Dallinger - 1891 - 1212 pages
...The images of these .screens can be seen in the image of the bright band. These screen* should noiv be moved so that their edges just touch the periphery...the apertometer they can be read off by inspection. Nevertheless a difficulty is experienced, from the fact that it is not easy to determine the exact... | |
 | William Benjamin Carpenter, William Henry Dallinger - 1891 - 1196 pages
...their edyes just touch the periphery of th« back lens. They act, as it were, as a diaphragm to out the fan and reduce it, so that its angle just equals...the objective. As the numerical apertures of these arts> are engraved on the apertometer they can be read off by inspection. Nevertheless a difficulty... | |
 | William Benjamin Carpenter, William Henry Dallinger - 1891 - 1210 pages
...angle just equals the aperture of the objective and no more. This angle is now determined by the are of glass between the screens ; thus we get an angle...the apertometer they can be read off by inspection^ Nevertheless a difficulty is experienced, from the fact that it is not easy to determine the exact... | |
 | Simon Henry Gage - 1899 - 272 pages
...portion of the instrument. The images of these screens can be seen in the image of the bright band. These screens should now be moved so that their edges...the apertometer they can be read off by inspection. Nevertheless a difficulty is experienced, from the fact that it is not easy to determine the exact... | |
 | Simon Henry Gage - 1901 - 324 pages
...it were, as a diaphragm to cut the fan and reduce it, so that its angle just equals the aperature'of the objective and no more." "This angle is now determined...get an angle in glass the exact equivalent of the aperature of the objective. As the numerical apertures of these arcs are engraved on the apertometer... | |
 | William Benjamin Carpenter, William Henry Dallinger - 1901 - 1258 pages
...more. This anirle j^ ||,m determined liv the arc of glass between the _ thus we get an angle in ijlass the exact, equivalent of the aperture of the objective....the apertometer they can be read off by inspection. Nevertheless a difficulty is experienced, from the fact that it is not easy to determine the exact... | |
 | Simon Henry Gage - 1908 - 386 pages
...portion of the instrument. The images of these screens can be seen in the image of the bright band. These screens should now be moved so that their edges...the apertometer they can be read off by inspection. Nevertheless a difficulty is experienced, from the fact that it is not easy to determine the exact... | |
 | Simon Henry Gage - 1908 - 376 pages
...these screens can be seen in the image of the bright band. These screens should now be moved so thai their edges just touch the periphery of the back lens....the apertometer they can be read off by inspection. Nevertheless a difficulty is experienced, from the fact that it is not easy to determine the exact... | |
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This angle is now determined by the arc of glass between the screens; thus we get an angle in glass the exact equivalent of the aperture of the objective. As the numerical apertures of these arcs are engraved on the apertometer they can be read off by... 