Mechanical drawing: lettering, materials and methods (1916)
Kepler, Frank R. (from old catalog) · Detroit, Mich., Pub. under authority of the Board of education · leaf 20
Figure 5 Figure 7 … Figure 6 On examination of Pig. 7, it is evident that the sum of all theangles about a point on the same side of a straight Une is equalto 180°, or two right angles. How many 60° angles about a pointon the same side of a straight line? How many 30° angles? 18 MECHANICAL DRAWING How many 45° angles…
Lettering · Mechanical drawing
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