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addendum circle Area axis beam compasses bisect blackboard blade Boiler bolt breadth called center line circum circumference compasses curved line cylinder desc describe arcs cutting Diam diameter dimensions direction distance dividers dotted draughtsman drawing board drawn edge equal erased figure fingers finished free-hand front elevation gear geometry given hand horizontal illus illustration inches India ink instruments length letters Linear Perspective machine marked measurements mechanical drawing object oblique Office Rules outlines paper parallel lines pencil perpendicular perspective picture plane pitch circle pitch line polygon position practice projection proportion radius represents retina right angles scale screw section lines Set-Square shading shaft sheet shop drawings shown in fig shows sketch solid space spur gear spur wheel square Steam Engine straight line student surface T-square tee-square thickness of tooth three views thumb tion top view triangle vanishing points vertical lines visual rays
Page 234 - Every line and letter (signatures included) must be absolutely black. This direction applies to all lines, however fine, to shading, and to lines representing cut surfaces in sectional views. All lines must be clean, sharp, and solid, and they must not be too fine or crowded. Surface shading, when used, should be open.
Page 236 - ... at the lower lefthand corner, all within the marginal line, but in no instance should they trespass upon the drawings.
Page 14 - ONE step and then another, And the longest walk is ended ; One stitch and then another, And the largest rent is mended ; One brick upon another, And the highest wall is made ; One flake upon another, And the deepest snow is laid.
Page 234 - The scale to which a drawing is made ought to be large enough to show the mechanism without crowding...
Page 91 - From a point P in this line draw the perpendicular P B to the line AB, and on P describe the circle BD, touching the lines and cutting the center line at E. From E draw EF perpendicular to the center line, cutting AB at F, and from Fig.
Page 236 - They should, if possible, measure at least one-eighth of an inch in height, so that they may bear reduction to one twenty-fourth of an inch; and they may be much larger when there is sufficient room.
Page 83 - A Proposition, is something which is either proposed to be done, or to be demonstrated, and is either a problem or a theorem.
Page 84 - AXIOMS. 1. Things which are equal to the same thing are equal to each other. 2. When equals are added to equals the wholes are equal. 3. When equals are taken from equals the remainders are equal.