The scientific papers of Sir William Huggins (1909)
Huggins, William, Sir, 1824-1910, Huggins, Lady, d. 1915 · London, W. Wesley and son · leaf 357
Miss Lassell for the loan of a 7-foot Newtonian telescope made by the lateMr. Lassell. The speculum, which is 7 inches in diameter, possesses great perfection of figure, andstill retains its original fine polish. I decided not to use more than 3^ inches of the central portionof the speculum, partly… … It will be seen at once from an inspection of the diagram that in this arrangement the disadvantageof a second reflection by the small mirror is avoided, as is also the mechanical inconvenience oftilting the speculum within the tube as in the ordinary form of the Herschelian telescope. The Sun and…
Astronomy
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