Word: eye
(lookup in dictionary)
(lookup stats)
Dates: during 1880-1889
Sort By: most recent first
(reverse)
...optical parts of the telescope are three-the eye-piece, the object glass, which is twelve inches in diameter and a plain mirror of eighteen inches in diameter, set in front of the object glass. Focal length is sixteen and a half feet. The telescope tube is rested permanently upon two stone piers, one near each end, and twelve feet apart. About five feet of the length of the tube projects into the observatory building and the remainder is out of doors...
...based are not new. It was planned by Professor E. C. Pickering and constructed by Mr. G. B. Clark, of the celebrated firm of Cambridge telescope makers. Its chief use will be for photometric observations, especially in classifying the stars into three groups, those visible to the naked eye, the catalogue stars or those from the sixth to the ninth magnitude, and those from the ninth to the fourteenth magnitude. It will also be valuable for the study of nebulae and Stella spectra, observations of occultations and observations for position...
...glass of the two telescopes is of the finest French make. The mirror is four inches thick, for any plate would probably change its shape from expansion or flexure. The telescopic tube is jointed so as to be air-tight throughout and at the eye-piece. Its material is steel plate one thirty-second inch thick. The temperature of the room does not effect its interior and no fogging of the object glass has occurred during cold nights...
...college management which must always, on general principles, be more or less regretted. For the overseers are, to all intents and purposes, outsiders-the representatives of alumni who live all over the country-and are intended to be what their name indicates-a sort of council to keep an eye on the doings of the faculty and students. They are, for the most part, men who live in or near Cambridge, and are generally men of high standing in their own callings, and an excellent body of advisers on any subject to which they may give their full attention...
...improved eye-shade. Its presence can scarcely be felt on the head...