Micrographia : containing practical essays on reflecting, solar, oxy-hydrogen gas microscopes; micrometers; eye-pieces, &c. &c. (1837)
Goring, C. R., 1792-1840, Pritchard, Andrew, 1804-1882, joint author · London : Whitaker and Co. · leaf 98
((/),having a spring in its interior, and a pinching screw to regulateits position. The wire (e) being thrust out or drawn in causesthe mirror to alter its inclination, corresponding to the positionof the sun ; when drawn home the mirror is at an angle of 45°,(being the smallest angle which can… … 86 ON MICROMETERS. lens, of one foot focus, which must not be of less than fiveinches diameter, and moreover, ought by all means to bemade achromatic. For this purpose it will not require a pieceof flint glass of that goodness indispensable to make a telescope ;it will be sufficient if it is…
Microscopy
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