Mechanical drawing : a manual for teachers and students (1902)
Cross, Anson Kent · Boston : Ginn & Co. · leaf 56
ed by Keuffel & Esser, 1877. 1 This is not a system of lettering, but a scientifically evolved system ofwriting which has the effect of lettering without requiring the same amouiU ofskill and consumption of time. 46 MECHANICAL DRAWING. GEOMETRIC LETTERS. ABCDEFGHIJKLMNDPgRS T U V W X Y Z… … 50. The development of any object gives the .real shapes of allthe surfaces of the object. It is obtained by unrolling or unfoldingthe surface and placing it upon a single plane surface. Objects aredevelopable or non-developable, according as their surfaqes may ormay not be laid out on a plane…
Mechanical drawing
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