## Self-help Mechanical Drawing: An Educational Treatise |

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angle appear Area axis base blade Boiler called circle Circum circumference compasses complete construction contains curve desc describe detail diameter dimensions direction distance dividers drawn edge elevation Engine equal example face figure finished foot free-hand front gear geometry given hand holding horizontal illus illustration inches length letters light machine marked means measurements mechanical drawing meet necessary NOTE object observer Office outlines parallel passing pencil perpendicular perspective pitch line plane position practice printed produced projection proportion radius rays reference represents right angles round rule scale shading shape sheet shown shown in fig shows side sketch solid space square standard Steam steel straight line student surface teeth termed thickness tooth triangle vertical wheel

### Popular passages

Page 238 - 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 87 - POSTULATES. I. LET it be granted that a straight line may be drawn from any one point to any other point.

Page 240 - ... at the lower lefthand corner, all within the marginal line, but in no instance should they trespass upon the drawings.

Page 18 - 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 238 - The scale to which a drawing is made ought to be large enough to show the mechanism without crowding...

Page 95 - 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 240 - 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 87 - A Proposition, is something which is either proposed to be done, or to be demonstrated, and is either a problem or a theorem.

Page 88 - 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.

Page 53 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.