Physical laboratory experiments : mechanics, optics and heat (1917)
Goodwin, H. M. (Harry Manley), 1870- · Boston : G. H. Ellis Co., Printers · leaf 138
r InstrumentenkuTide 13, p. 257, 1893, also in StinesPhotometric Measurements, p. 145. To emit one Hefnerunit, the lamp should burn under normal atmosphericpressure and aver-age humidity (8.8litres of moistureper cubic meter ofdry air), and nor-mal average car-bon dioxide con-tent, the flamebeing… … Fig. ». 10 PHYSICAL LABORATORY EXPERIMENTS The disadvantages of this standard are its reddish color andthe fact that the intensity varies slightly with the humidityof the air, the per cent, of carbon dioxide in the air, and thebarometric pressure. The effect of each of these factors hasbeen…
Physics · Mechanics
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