Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 481
placed, the distanceof E to B being also adjustible ; then, by altering thelengths of B E and B c, the image of the negative canbe made to appear of suitable size. At the end, c, apiece of sensitive paper is placed, and the light of thesun being allowed to fall through the negative andlens, the… … Fig. 209.—Enlarging Camera, f, heliostat for throwing beam of sunlight on thereflector, which throws it into the camera ; E, negative ; B, focussing-lens ;c, plate- or paper-holder ; D, focussing-screw. with the sun by attaching a string to an equatorialtelescope, moved by clockwork ; or a…
Astronomy · Telescopes
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