Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 137
eremade, until at lastLord Rosses levia-than, which has amirror six feet in di-ameter, was mounted at Parsonstown, Ireland, fifty yearsago. No other reflector of equal size has yet been con-structed. Its mirror was made of polished metal. It isnow customary to make the mirror of glass, and to… … Fig. 64. -Alvan G. Clark, Optician, ofCambridge, Mass. A Gieat Telescope 131 Since reflectors are little used in this country, wereturn to the history of the common form of telescope,which is called a refractor. The name refractor arisesfrom the fact that rays of light, in passing through alens,…
Astronomy
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