. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. 1:30 920 1790 2:00 850 1790 2:30 830 1740 3:00 860 1730 3:30 840 1720 4:00 770 1740 4:30 870 1730 5:00 840 1730 5:30 940 1760 6:00 1470 1790 6:30 1700 1700 7:00 1660 1560 7:30 1770 1380 8:00 1770 1300 8:30 1760 1310 9:00 1770 10
. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. 1:30 920 1790 2:00 850 1790 2:30 830 1740 3:00 860 1730 3:30 840 1720 4:00 770 1740 4:30 870 1730 5:00 840 1730 5:30 940 1760 6:00 1470 1790 6:30 1700 1700 7:00 1660 1560 7:30 1770 1380 8:00 1770 1300 8:30 1760 1310 9:00 1770 1620 9:30 1760 1590 10:00 1330 1590 10:30 1440 1460 11:00 1800 1310 11:30 1800 1270 12:00 1770 880 PRACTICAL MATHEMATICS 151 *m 7&» AA/tp S& 14 1 BURNING TIMEIN HOURS CANDLE POWERCARBON CAUDLE POWERTUNGSTEN -hm 0 too 200 400 600 800 1000 I 200 1400 1600 1800 2000 2200 16 I I 6 16 16 16 15-7 I I ZOO 400 600 800 I00O 1200 1400 1600 1800 2000 2200 NUMBER OF HOURS BURNEDFig. 6S. Candlepower Curves for Carbon and Tungsten Lamps 200. 1875 1880 1890 1910 Fig. 69. Curve Showing Variations in Market Price of Wheat 152 PRACTICAL MATHEMATICS of its original value in 2,200 hours. Further, the tungsten lampheld a uniform candlepower practically for 600 hours, while thecarbon lamp began to decline rapidly after 100 hours of burning. 12. Curve of Wheat Prices. The price of wheat per bushelvaries considerably from year to year, as may be seen from Fig. fairly good idea of the variation can be obtained by running downthe column of figures in the table, but it is not nearly as easy tocarry the maximum and minimum prices as to have them pictured lllllilll H TABLE DIAM. INCH. CURVE-A-R. P. M.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmathematics, bookyear
