Poynting, J. H. (John Henry), 1852-1914, Shakespear, Gilbert Arden, ed, Barlow, Guy, joint ed · Cambridge, University Press · leaf 46
ss-pieces, on the narrower part, ABCD,of the frame, with the beam parallel to AD, and its right end towards thetelescope. In order to observe the position of the beam, a inirror, 1| inches by | inch,is fixed in the centre of the beam, and the reflection of a vertical scale (s.Fig. 1) in this is… … Fig. 1. is given by the division of the scale upon the cross-line on the eyepiece of thetelescope. The scale, which was photographed on glass, and reduced froma large scale, drawn very carefully, has 50 divisions to the inch. These areruled diagonally with ten vertical cross-lines; It is possible…
Poynting, J. H. (John Henry), 1852-1914 · Physics
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