Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . CONIC SECTIONS. 43. Similarly, if a tangent at R^ were wanted we may first find r, corresponding to R^; draw thetangent-?•/ to the small circle; then join J, (constant point), with R^. 133. Occasionally we have given the length and inclination of a pair of diameters of the elhpse,^ig-. as. making oblique angles with each other. Such diameters N are called conjugate and the curve may be constructediTpon them thus: Draw the axes TD and HK ai theas
Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ..draughtsmen .. . CONIC SECTIONS. 43. Similarly, if a tangent at R^ were wanted we may first find r, corresponding to R^; draw thetangent-?•/ to the small circle; then join J, (constant point), with R^. 133. Occasionally we have given the length and inclination of a pair of diameters of the elhpse,^ig-. as. making oblique angles with each other. Such diameters N are called conjugate and the curve may be constructediTpon them thus: Draw the axes TD and HK ai theassigned angle D 0 H; construct the parallelogram M NX Y; divide D M and D 0 into the same number ofequal parts; then irom K draw lines through the pointsof division on D 0, to meet similar lines through H andthe divisions on D M. The intersection of like nimiberedlines will give points of the elliiDse. 134. It is the law of expansion of a j^erfect gas that the volume is inversely as the is, if the volume be doubled the pressure drops one-half; if trebled the pressure becomes one-third, etc. Steam not being a perfect gas departs somewhat from the abo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectlettering
