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Updated: May 10, 2025
"Jan. 1, 1855. I put some wires into my little transit this morning. I dreaded it so much, when I found yesterday that it must be done, that it disturbed my sleep. It was much easier than I expected. I took out the little collimating screws first, then I drew out the tube, and in that I found a brass plate screwed on the diaphragm which contained the lines.
In addition to the observations which he has left us, he was the first inventor or proposer of the collimating telescope, an instrument which has become almost a necessity wherever accurate observations are made. The fact that the subsequent invention by Bessel may have been independent does not detract from the merits of either.
We made the comparison light part of the light we were measuring. Light which enters the collimating lens partly passes through the prisms and is partly reflected from the first surface of the prism; that we utilize, thus giving a second shadow. The reflected rays from P fall on G, a silver on glass mirror. They are collected by L , and form a white image of the prism also at F.
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