Comparative tests of carbon, metallized carbon and tantalum filament lamps . . . ; Rated Watts per C. P. 3 .1 2 5 2. 0 Total Lamp HoursTotal Candle Power HoursTotal Kilowatt HoursNo. Burnouts in 800 Hrs. Cost of Lamps Each $ 17 $ 25 $. 51 Total Cost Lamps & Re-newals $ $ $ $ $ $ Cost of Power Per $ .01 f$ 03 $
Comparative tests of carbon, metallized carbon and tantalum filament lamps . . . ; Rated Watts per C. P. 3 .1 2 5 2. 0 Total Lamp HoursTotal Candle Power HoursTotal Kilowatt HoursNo. Burnouts in 800 Hrs. Cost of Lamps Each $ 17 $ 25 $. 51 Total Cost Lamps & Re-newals $ $ $ $ $ $ Cost of Power Per $ .01 f$ 03 $ .05 Total Cost 1$ .07 of Lamps J$ .10 and Energy 1$ .12 Per , j$ .15 $ .20 [ $ .00466$ .0119$ .0192$ .0264$ .0373$ .0447$ .0555$ .0736 $ .00553$ .0138$ .0221$ .0305$ .0429$ .0512$ .0637$ .0843 $ .00477$ .0105$ .0162$ .0220$ .$ .0363$ .0449$ .0593 $ .00818$ .0144$ .0207$ .0270$ .$ .0427$ .0520$ .0678 $ .00652$ .0107$ .0148$ .0189$ .0252$ .0293$ .$ .0459 $ .0092$ .0133$ .0179$ .0225$ .0295$ .0343$ .0418$ .0524 AMRINE—COMPARATIVE TESTS OF LAMPS 37. H .01 .03 .05 .07 .09 .11 .13 .15 .17 .19 .21 .23 .25 Fig. 31 Cost of P^nergy Pek K. W. Hour lamps upon pooily regulated alternating current circuit withsome vibration, that is, condition B. Considering the curve for the carbon lamp working undercondition A it is seen that for very low prices per kilowatt-hourfor power, this lamp is the most economical on account of thesmall number of burn-outs and the low cost of the lamps. Forcosts of power from $.011 to $.022 per kilowatt-hour the metal-lized lamp gives the lowest cost, while for all the higher prices ofenergy the tantalum gives the best economy. For condition Bthe relative performance does not change a great deal, thoughon account of the large number of burn-outs with the metallizedlamp at no time does it give the most economical results. These results seem to show that so far as economy of oper- 38 ILLINOIS ENGINEERING EXPERIMENT STATION /carbon
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