Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 167
making the back of the mirror andits support perfectly flat, so as not to require levers orsoft backing ; this arrangement would probably fail formirrors larger than one foot in diameter, althoughanswering admirably for those of less size. We will now consider the methods of mountingspecula of… … Fig. 72. Mr. Brownings method of supporting .small specula. The bottom ofthe speculum A is a carefully prepared plane surface, and the outer rim of theinner iron cell B, on which it rests, is also a plane. The speculum is kept inthis cell by the ring G G, and it may be removed from, and replaced…
Astronomy · Telescopes
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