Word: refractors
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...largest refracting lens in use is that of the great Yerkes telescope, with an aperture of forty inches. The Lick lens is thirty-six inches in aperture; the Royal Astrophysical Observatory at Potsdam has recently acquired a thirty- one inch photographic refractor; and the Pulkowa Observatory has a thirty inch lens, made by the late Alvan Clark of Cambridge. Greenwich and Washington have telescopes with apertures of twenty-six-inches. The largest instrument in the possession of the Harvard Observatory is the twenty four inch Bruce photographic telescope, mounted at Arequipa...
...building, on which is to be our observatory, was open on Dec. 6th, when Venus took her skip across the sun's face. The winding staircases leading to the top were crowded all day long with students desirous of observing the transit through Prof. Lee's equatorial refractor. Your correspondent ruined his constitution by a climb along with the rest of the eager star-gazers. He was exceedingly disappointed with his observations and obtained about as much satisfaction as he would had he gazed through a sheet of smoked...