Self-help Mechanical Drawing: An Educational Treatise

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T. Audel & Company, 1902 - Mechanical drawing - 287 pages
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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 83 - POSTULATES. I. LET it be granted that a straight line may be drawn from any one point to any other point.
Page 236 - ... at the lower lefthand corner, all within the marginal line, but in no instance should they trespass upon the drawings.
Page 234 - One inch from its edges a single marginal line is to be drawn, leaving the "sight" precisely 8 by 13 inches. Within this margin all work and signatures must be included. One of the shorter sides of the sheet is regarded as its top, and measuring...
Page 99 - The Tangent of an arc is a line touching the circle in one extremity of the arc, and continued from thence, to meet a line drawn through the center and the other extremity. Thus...
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 49 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.

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