Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 6
-paper block) Drawing ink (Black, waterproof) Penholder and lettering pens (See chapter on lettering) Dusting brush or cloth Penwiper Erasing shield Drawing Board.—Drawing boards are made of soft wood, usuallywhite pine or basswood, free from knots and with the upper surfacedressed to a true plane… … Fig. 2.—Drawing Boards. cleats so fastened that the wood of the board is free to expand or con-tract. Saw cuts made with the grain and part way through the boardfrom the back (Fig. 2b) further reduce any tendency to warp. The working edge, along which the head of the T-square is operated,must be…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-62-9.webp)