Stars and telescopes; a hand-book of popular astronomy founded on the 9th ed. of Lynn's Celestial motions (1901)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911 · Boston, Little, Brown · leaf 110
rther. Be-low, on this page, is an illustration of this extraordinary instru-ment, reproduced from a photograph kindly sent me by Pro-fessor 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 Grunow… … 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, asthey…
Astronomy
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