Studies of instruments for measuring radiant energy in absolute value: An absolute thermobile (1916)
National Bureau of Standards · leaf 10
resistance of platinum, which is positivewhen unblackened, becomes negative after it is given a coating 10 This Bulletin, 9, p. 283; 1913. Coblentz 1Emerson] Values of the Constant of Total Radiation 5ii of platinum black. This is illustrated in Fig. 3, which showsthe change in resistance of the… … .0t8 -OSOTherlO.Off .C^3pT Fig. 3.—Showing the change- in resistance with temperature {heating current) of receiversof therlo, No. j, and platinum 3. THERMOPILE AND GALVANOMETER These two instruments have been described elsewhere,11 andit will be sufficient to add that the thermopile with its…
Measurements and use of instruments · Rays and radiation · Heat flow, thermal and thermodynamic processes
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