Incandescent electric lights . measurements of lamps weremade at the angle of equal illumination. In order to determine the economy of alamp at different degrees of incandescence,an Edison lamp was measured at intensi-ties ranging from a dull red to 40 candlepower, and the results plotted in a curveshow a rapid rise in economy as the candlepower increases. While the economy ofa lamp increases with incandescence, itslife shortens, but as I have had neither _ o Ol K> O to Ol CO O CO Ol F» O ?** OI • O -a CD I j )TOE. 75 time nor opportunities for life tests, Icannot give data for life at
Incandescent electric lights . measurements of lamps weremade at the angle of equal illumination. In order to determine the economy of alamp at different degrees of incandescence,an Edison lamp was measured at intensi-ties ranging from a dull red to 40 candlepower, and the results plotted in a curveshow a rapid rise in economy as the candlepower increases. While the economy ofa lamp increases with incandescence, itslife shortens, but as I have had neither _ o Ol K> O to Ol CO O CO Ol F» O ?** OI • O -a CD I j )TOE. 75 time nor opportunities for life tests, Icannot give data for life at various degreesof incandescence. Mr. Edisons standard of illuminationhas been 16 candle power, and his aim hasbeen to produce a lamp that will give goodeconomy and a reasonable life at thatcandle power. To determine the energy consumed bythese lamps when burning at their normalcandle power, five lamps, as made at pres-ent by Mr. Edison, were tested with thefollowing results : TABLE SHOWING ENERGY CONSUMED BY Ohms. Foot-pounds of Electricity per minute. 3178-033021-913107-412861-153319-32 Showing an average of 3,097 —564 ft. 1000 Ft lbs. of Electrioit y per mi 4000 5000 6000 I ! o \l \ \ \ o o V o (0 \ op 0 £ 4 cm™ s=o™a nun between economy and h^esoenoe. 76 lbs. of electricity per minute, or per h. p. of electricity, giving 170candles per h. p. Mr. Edison gets lamps per horsepower of electricity, but as he allows a lossof 10c of the electrical energy used in thelamps upon the conductors, he gets for each h. p. of electricity genera-ated. As the average commercial efficiencyof this generator is .887, this gives lamps per dynamometrical h. p. The report of the Board of Commis-sioners of the Millers Exhibition, held inCincinnati just one year ago, gives the re-sults of the trial of three modem steamengines. These results show an average for thethree engines of .878 of the indicatedpower converted
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