Geometrical drawing; a collection of plates for practical use in elementary mechanical drawing
A plate book of geometrical drawing exercises compiled by Ferdinand F. H. Schraidt and published in San Francisco in 1915 for students of elementary mechanical drawing. The plates are fine black line diagrams on tinted paper: ellipses built from construction arcs, cam and cycloid curves plotted point by point, rosettes inside circles, with dimension ticks and lettered reference marks.
