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THE POPULAR SCIENCE MONTHLY.
From careful comparisons of different kinds, it has been found that the power of the Washington telescope is about the same as that of Lassell's great four-foot reflector, and the two drawings. Figs. 5 and 7, are therefore nearly comparable, i.e., almost as if made with the
Fig. 7.—Trouvelot, 1875 (26-inch Telescope).
same telescope at different times. It may be said of the last drawing that nothing is there laid down about which the slightest doubt is entertained; and although, in some respects, it was made in greater haste than is desirable, yet it is sufficiently accurate to found an argu-
