. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. 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 Fi
. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. 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. DIAM. OF EMERY WHE^t 10000 3000 8000 7000 6000 5000 4000 3000 2000 1000 20 Id 16 14 12 10 8 6 4 2 Fig. 70. Speed Curves for Emery Wheels and Pulleys graphically by a curve. The curve is plotted from the data givenin the table and a glance will show that the maximum price is $2per bushel in 1888 and the minimum price 63fc. in 1894. Thevalue of such curves in all business lines where prices of commodi-ties vary from time to time is readily seen. 13. Speed Curves for Wheels or Pulleys. The curve, , shows how. for a certain surface or rim speed, the revolutions PRACTICAL MATHEMATICS 153 per minute of an emery wheel is obtained when its diameter is this particular case curve A and curve B represent the usualsurface speeds of the two grades of emery wheels. Similar curvesmay be drawn for the usual surface speed of any wheel or pulleyand then with the diameter given the revolutions may be obtained,or with the revolutions given the diameter may be obtained. Sucha curve is a ver
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