Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 116
farther. Be-low, on this page, is an illustration of this extraordinary instru-ment, reproduced from a photograph kindly sent me by Pro- r LANGLEY. It shows only the bolometer portion of theentire apparatus, in its case and with the connections as inactual use. The bolometer was built by (rRUNOW of… … BOLOMETER IN WATER-JACKET, WITH CYLINDRIC LENS perature fluctuation as minute as the millionth part of a degreecentigrade. It is proper to add that the researches conductedwith such an instrument, often appearing remote and meaning-less to a layman, are eminently practical in their bearing, asthev…
Astronomy
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