Putnam, J. Pickering (John Pickering), 1847-1917 · Boston, Ticknor and Co. · leaf 36
theform of the back only of the fireplace used inthe first series of experiments, the sides formingan angle of 135 degrees with the back, to im-prove their reflecting power. In the secondseries the fireplace was smaller, shallower, andthe sides were at light angles with the back, theupper half of… … 4 T II E 0 P K N FI R E PL AC E. receive a chemists Centigrade thermometer, and the heat was tested atthis {mint during the experiments in order to ascertain the amount lost byabsorption in the upper half of the chimney. The thermometer was sur-rounded by putty to render it air-tight. When the…
Fireplaces
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