Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 184
ails atall are visible, all outlines are blurred, or stellar characteris lost. The testins^ of a glass therefore refers to two differentqualities which it should possess. Its quality as tomaterial and the fineness of its polish should be suchthat the maximum of light shall be transmitted.… … Al \&2 STAHaAZ[NG : PAST AND PRESENT. [liOOK 11. not absolutely nil, but sufficient to suiTound objects withn faint violet light. In close double stars therefore, or in the more minutemarkings of the sun, moon, or planets, we have tests ofits defining power ; and if this is equally good in…
Astronomy · Telescopes
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