On the Adjustment And Testing of Telescopic Objectives
On the Adjustment And Testing of Telescopic Objectives
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Although the observations recorded in Table VI. Do not F admit of great exactness, especially when -^- becomes great, yet they seemed to me reliable enough to prove that the / F\ 2 thickness of the visual focal layer does not vary as \~jr-) > but (p\i6 P -JT ), since doubling the ratio ~j- was found * This fraction should really be considerably less than one-quarter, since it is a well-known fact that the greater portion of light in the out of focus penumbra is concentrated in the outer annulus....
to be about treble the thickness of the focal layer (or rather more than that). Turning again to Fig. I, it will be seen that I have indicated one focal layer / x --/ x just where the published measurements of the Lick refractor state it to be situated, its centre or the focal plane being at -27 inch behind the minimum focus. Now the curve L--L--L in Fig. I (as in Figs. 2, 3 and 4) is the curve of luminous intensity for the normal solar spectrum, the wave length scale being exactly the same as that at the left-hand end of each diagram.
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To quickly assess the difficulty of the text, read a short excerpt:
Although the observations recorded in Table VI. Do not F admit of great exactness, especially when -^- becomes great, yet they seemed to me reliable enough to prove that the / F\ 2 thickness of the visual focal layer does not vary as \~jr-) > but (p\i6 P -JT ), since doubling the ratio ~j- was found * This fraction should really be considerably less than one-quarter, since it is a well-known fact that the greater portion of light in the out of focus penumbra is concentrated in the outer annulus....
to be about treble the thickness of the focal layer (or rather more than that). Turning again to Fig. I, it will be seen that I have indicated one focal layer / x --/ x just where the published measurements of the Lick refractor state it to be situated, its centre or the focal plane being at -27 inch behind the minimum focus. Now the curve L--L--L in Fig. I (as in Figs. 2, 3 and 4) is the curve of luminous intensity for the normal solar spectrum, the wave length scale being exactly the same as that at the left-hand end of each diagram.
What to read after On the Adjustment And Testing of Telescopic Objectives?
You can find similar books in the "Read Also" column, or choose other free books by T Cooke to read onlineMoreLess
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