How to Make and Use Graphic Charts

actual amount average axes axis boiler brake horsepower Calgary Cent coal column construction corresponding curve decrease determined diagram diameter distance Dollars draw efficiency Electrical World Engineering equation example expense factor feet figures formula give given graph horizontal illustration inches increase indicate induction motor intersection isometric isopleth June length load logarithmic logarithmic scale machine manufacturing material maximum method month motor N scale necessary nomograph obtained operation output paper percentage period pipe plotted plowing pounds problem production profit pump quantity Railway ratio record represent revolutions per minute ruled paper scale schedule seam sheet shown in Fig shows slide-rule sodium oxide specific gravity speed square standard steam plant steel straight edge straight line tensile strength thermal efficiency tion tons tractor traffic trip truck unit variables voltage