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 23
t while the free end is moved with the other.Where the beam is very long the use of a rolling carrler for the tois a convenience, and such an attachment may be obtained foi most in-struments. . , . -, ., _ Drafting Machines.—Various mechanisms have been devised to re-duce the constant moving about… … Fig. 26.—The Universal drafting machine. uated head to be moved to any portion of the drawing without rota-tion. The two interchangeable drafting edges (graduated with suit-able scales) always remain at right angles and parallel to their initial
Mechanical drawing
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