Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 210
the most common illustration of this practice. A cubic foot of air at the earths surface weighs about 1700grains; at the height of 3| miles it would weigh one-half, or850 grains ; and for every additional 3| miles its weight wouldbe decreased by one-half. From these data construct the… … 2.1 ^MIU^, be the zero point, and figure each division with a multiple of3|. These will represent the various altitudes in miles. Fromeach of these points draw the lines C, l, c, d, etc., perpendicularto AB. Let the line AC, which niay be drawn to any convenient I90 PRACTICAL PLANE GEOMETRY chap,…
Geometrical drawing
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