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Addendum American angle Architect's scale assembly drawing auxiliary view axis basic beam compass bolts cast iron chart circle circuit cone construction cutting plane cylinder decimal detail drawing diagram dimension lines distance Divide drafting draftsman draw lines drawn edge elevation ellipse Figure fits flat front view gear guide lines head hidden lines hole horizontal illustrated in Fig inch indicated intersecting irregular curve isometric Keuffel and Esser key sizes knurl letters located machine material mensions method multiview number of equal Number of Teeth nuts object parallel pencil perpendicular PITCH DIAMETER plan view position principal views Problem protractor radius reference line scale screw threads section lines sectional view shaft shape shown in Fig side view sizes slot space specified spur gear square standard steel straight stretchout surface T-square tangent tion tolerances tooth top view triangle true length vertical weld symbol width WORM GEAR Zip-A-Tone