Self-help Mechanical Drawing: An Educational Treatise

T. Audel & Company, 1903 - 287 σελίδες
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Δημοφιλή αποσπάσματα

Σελίδα 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.
Σελίδα 87 - POSTULATES. I. LET it be granted that a straight line may be drawn from any one point to any other point.
Σελίδα 240 - ... at the lower lefthand corner, all within the marginal line, but in no instance should they trespass upon the drawings.
Σελίδα 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.
Σελίδα 238 - The scale to which a drawing is made ought to be large enough to show the mechanism without crowding...
Σελίδα 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.
Σελίδα 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.
Σελίδα 87 - A Proposition, is something which is either proposed to be done, or to be demonstrated, and is either a problem or a theorem.
Σελίδα 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.
Σελίδα 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.

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