Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 189
NELS I2°xl4-8| ROOF TRUSS Zl COAT OF GRAPHITE PAINT DRILL {z Z12 HOLES EOUALLY SPACED TO FIT Z ZPiECE NO. 117 PISTON FOR 10 z zK p. HORIZONTAL ENGINE z Fig. 194. Lettering Plate 22 (183) 184 MECHANICAL DRAWING PREPARATORY INSTRUCTION FOR DRAWING PLATE 23 Locating Points of Tangency. To secure… … FiG. 195. Method of Locating Points of Tangency metrical principle that a line perpendicular to a tangent at itspoint of contact passes through the center of the circle. To locate a point of tangency, place the hypotenuse of eithertriangle against any edge of the other triangle, as shown inFig.…
Mechanical drawing
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