Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 19
of the drawingpaper, consists of a thin sheet of flexible metal,usually brass, provided with slots and holes ofvarious shapes and sizes. The shield or guardpermits erasures to be made of limited size with-out damage to the rest of the drawing. Drawing Ink. Black drawing ink, preferablysome make of…
Mechanical drawing · Machine design
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
