Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 166
the telescope depends greatly on thebacking of the speculum, and numerous methods ofcarrying specula on soft backing and systems of levershave been suggested, all aiming at carrying them so thatthey are free from all possible strain and flexure oc-casioned by their own weight. For smaller mirrors… … 144 STARGAZING : PAST AND PRESENT. [book ]I. the side of a sort of circular tray, will give it sufficientsupport when inclined to the horizontal. Mr. Browningadopts the plan of making the back of the mirror andits support perfectly flat, so as not to require levers orsoft backing ; this arrangement…
Astronomy · Telescopes
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