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THE TELESCOPE

(FROM THE ENCYCLOPÆDIA BRITANNICA.)

BY

SIR JOHN F. W. HERSCHEL, BART., K.H.,

M.A., D.C.L., F.R.S. L. & E., HON. M.R.I.A., F. R.A.S., F.G.S.,
M.C.U.P.S., ETC. ETC.

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INTRODUCTORY NOTICE.

THE little Volume here presented to the public is the reprint in a separate form of an article on the Telescope written for the Encyclopædia Britannica, under the express condition of extreme brevity. It would not have been difficult for the Author, had the pressure of other avocations allowed him, to have extended it into a more complete treatisebut this has not been the case, and the wishes of the Editors of this work being, that it should appear, as nearly as might be, simultaneously with two other articles from the same source, it is here given with but little additional matter, which is distinctly indicated by a different mode of designating the numerical citation of the sections in their order of occurrence.

COLLINGWOOD, July 17, 1861.

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