Leeds, Charles Carley, 1870- [from old catalog] · New York, D. Van Nostrand company · leaf 11
ely, so that it revolves on its axis as it is dragged along theruling edge. This method will result in lines of an even thickness and color, and. Fig. 7. another, and about \ of an inch apart; then, with the flat-point end ofthe pencil, rule with the T square a fine, clear, straight, horizontal… … Fig. 8 LESSON No. I.—Continued. pencil point in position and bringing the ruling edge gently up to it.These fine lines are called construction lines, from the fact thatwhen used in practice, the drawing is built upon them. The studentshould endeavor to •split the point each time. Now, with the…
Mechanical drawing
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