Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 141
7. The distance L is equal to the distance around thecylinder and the height H of course remains equal to the lengthof the cyUnder. Other surfaces, such as the surface of a sphere,cannot be exactly developed, but there are approximate methodswhich are generally accurate enough. 123 124 ESSENTIALS… … rig. 297 distance around the prism. At each of the points a line is drawn equal to the long edge of the prism and the ends joined together. Then the two ends of the prism are measured out as shown. i The development of the lateral surface of a hexagonal prism
Mechanical drawing
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