Blueprint reading; a practical manual of instruction in blueprint reading through the analysis of typical plates with reference to mechanical drawing conventions and methods, the laws of projection, etc (1919)
Fairfield, Howard Parker, 1858-, Kenison, Ervin, Waite, Edward B. (Edward Broughton), 1873-, American Technical Society · Chicago, American technical society · leaf 226
d line, and this is usually abbreviatedto GL. The projections may be placed at any convenient distanceabove or below the GL, unless these distances are given in any prob-lem. In beginning all ordinary projection work, it is customaryto show the GL as a horizontal line between the front elevation… … Fig. lOi. Typical Projections over the corresponding points in the front elevation. Althoughthe ground line is usually used in learning the subject of projections,it is customary to omit it in practical work. Rules of Projection. (1) If a surface is perpendicular to eitherplane of projection, its…
Mechanical drawing · Blueprinting
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