. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. ot, mark it Plt and goto the next set of values. The table shows that the second text-book was completed in 32 hours. Read out 10 spaces to the rightof the origin on the horizontal axis and up the vertical line to thehorizontal line representing 32 hours; place a dot at the intersec-tion of these two lines, thus locating point P2. Continue in exactlythe same manner until all points have been plotted for the eig
. Practical mathematics : an elementary treatise covering the fundamental processes of arithmetic, algebra, and geometry, with a practical presentation of logarithms and curve plotting. ot, mark it Plt and goto the next set of values. The table shows that the second text-book was completed in 32 hours. Read out 10 spaces to the rightof the origin on the horizontal axis and up the vertical line to thehorizontal line representing 32 hours; place a dot at the intersec-tion of these two lines, thus locating point P2. Continue in exactlythe same manner until all points have been plotted for the eight PRACTICAL MATHEMATICS 137 textbooks. After all points have been plotted, draw a smooth linethrough the points and obtain the curve C. If the student is care-ful, he can draw in this curve freehand with a lead pencil, but inorder to make a smooth line, an irregular curve of the type shownin Fig. 56 may be used to advantage. These curves can be purchasedat any stationery store for a small sum. It is well to have one curveas well as a good ruler for this work. Transmission Rope Curve. To further illustrate the plottingmaterials let us take another practical case. The engineering. Fig. 56. Typical Irregular Curves. These are made of Wood, Hard Rubber, or Celluloid department of a certain firm manufacturing transmission steel rope,having made tests of the horsepower developed by rope running atcertain velocities, expressed this relation in the form of a velocities of the rope and the corresponding horsepowers devel-oped are arranged in tabular form above the curve, Fig. 57. The velocity of the rope in feet per second is chosen as the verti-cal value and the corresponding horsepower as the horizontal value,using a scale of 1 space on the vertical axis to equal 2 feet per second,and 1 space on the horizontal axis to equal 4 horsepower. To plotpoint Pj, lay off to scale on the horizontal axis 27 horsepower, remem-bering that one square equals 4 horsepower; that is, 27 hors
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmathematics, bookyear
