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 145
her to three, places of figures froma diagonal scale. On the parallel indicated by the third figure, measure fromthe diagonal indicated by the second figure to the vertical lineindicated by the first. PROPORTIONAL SCALES. These are used for enlarging or reducing a drawing to a givenproportion :… … Fig. 250. ments on the drawing, and produce it to C; make BC one-thirdof AB. On AB erect the perpendicular BD any length, andjoin AD and DC. Divide BD into any number of equal parts,and draw lines parallel to AB. These lines are simply a guideto enable the measurements to be made parallel to the…
Geometrical drawing
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