Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . Definition of Working Drawing. A working drawing of anyobject is a drawing which completely describes the object in everyparticular, showing its fonn, size, material, finish, and all otherdetails, so that a workman may take the drawing and without anyfurther instructions make the object exactly as the draftsman in-tended it to bo The drawio is, therefore, a sort of lan-gua
Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . Definition of Working Drawing. A working drawing of anyobject is a drawing which completely describes the object in everyparticular, showing its fonn, size, material, finish, and all otherdetails, so that a workman may take the drawing and without anyfurther instructions make the object exactly as the draftsman in-tended it to bo The drawio is, therefore, a sort of lan-guage, by which the man who designs the object describes it to ths 33 4 MECHANICAL DRAWING man who is to make it. Fig. 1 shows the working drawing of abell crank lever. The drawing itself shows the shape and thedimensions show the size. Aside from dravings of buildings, etc., that is Architecturaldrawings, the greater part of the working drawings which aremade are for machines, and we will consider chiefly the latter, or,as thcj are called, machine drawings. These drawings are almostalways orthogra])hic ])rojections, as this is by far the easiest andbest way to represent a machine or a 2)art of a machine. Some-. PTH Fig. 1. times, when it is desired to give a sort of birds-eyo view of amachine, an isometric or an oblique projection is made, but thismethod involves so much labor that it is seldom used. Lines, la order to make a drawing perfectly clear, and toavoid confusing one line with another, different kinds of lines areused for different purposes. Fig. 2 shows the six most commonkinds used. The ordinary^/w/Z lines are used to represent visiblelines of the object which is being drawn. 64 MECHANICAL DRAWING. 5 The invisible lines are used to represent lines of the objectwhich woulil be liidden from sight if a person looked iu the direc-tion ill which he imagines himself to be looking while he isdrawing it. The use of the shade lines will be explained later. Center lines are used
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