Side-lights on astronomy and kindred fields of popular science; essays and addresses (1906)
Newcomb, Simon, 1835-1909 · New York Harper · leaf 125
h for new comets.This requires a very practised eye, in order that the IOI SIDE-LIGHTS ON ASTRONOMY comet may be caught among the crowd of stars whichflit across the field of view as the telescope is moved.It is also necessary to be well acquainted with a num-ber of nebulas which look very much… … THE BROKEN-BACKED COMET-SEEKER and in the best manner, the observer should havewhat among astronomers is familiarly known as a broken-backed telescope. This instrument hasthe eye-piece on the end of the axis, where one wouldnever think of looking for it. By turning the in-strument on this axis, it…
Astronomy
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