Difference between revisions of "Page:ASC 1868 07 11 13-11.pdf/3"
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| + | [[Category:ASC Proofread]] | ||
| + | [[Category:ASC Pages]] | ||
| + | [[Category:ASC Letters]] | ||
| + | specified by you - viz to produce an image 22<sup>c</sup> at a distance of 50<sup>c</sup> | ||
| + | <p>The colored fringes mentioned by you are simply due to aberration from diff<hi rend="underline">ractio</hi>n, an account of the aperture of diaphragm not being sufficiently large, and this I think will vanish when you have removed the circular ring containing the cross wire</p> | ||
| + | <p>Awaiting the favor of your reply</p> | ||
| + | I am, Rev<sup>d</sup> Sir,<lb/> | ||
| + | Yours most Obediently<lb/> | ||
| + | J.H. Dallmeyer<lb/> | ||
| + | |||
| + | The Rev<sup>d</sup> P.A. Secchi | ||
Latest revision as of 17:39, 4 October 2020
This page has not been proofread
specified by you - viz to produce an image 22c at a distance of 50c
The colored fringes mentioned by you are simply due to aberration from diffraction, an account of the aperture of diaphragm not being sufficiently large, and this I think will vanish when you have removed the circular ring containing the cross wire
Awaiting the favor of your reply
I am, Revd Sir,
Yours most Obediently
J.H. Dallmeyer
The Revd P.A. Secchi
