This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...which a line may be drawn with ease but with doubtful accuracy. A dot from a sharp pencil, as shown at F, Fig. 136, is much better; but if by reason of roughness of surface such a dot is too indistinct, two lines meeting each other at an angle may be used, G, Fig. 136, the point of juncture indicating the required ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...which a line may be drawn with ease but with doubtful accuracy. A dot from a sharp pencil, as shown at F, Fig. 136, is much better; but if by reason of roughness of surface such a dot is too indistinct, two lines meeting each other at an angle may be used, G, Fig. 136, the point of juncture indicating the required location. 118. A Jointed Face is a surface that has been made a true plane. The necessities of practice so often require jointed faces at right angles to an adjoining face, that to many the term has come to mean not only a true plane, but such a surface at right angles to another, from which it is said to have been "jointed." 119. A Working-Face is one selected as a guide for operations to be performed on an adjoining face. For accurate work the working-face must be jointed. At this face, all measurements have their beginning, and by it all lines are produced. If a piece of material is to receive lines on two opposite sides, as A and C, Fig. 136, either B or D may be used as a workingnot both; if it is to receive lines on four faces, as A, B, two of them, as A and B, for example, must be work; if on six faces, three must be working-faces. For suppose lines are to be made on the surface A, Fig. B as a working-face; those running across the piece, then be made perpendicular to B, and those running as cd, parallel to B. If, on the contrary, the workdisregarded, and some of the lines are made from ne from D, their truth will depend not only on the truth of B and D as individual surfaces, but also upon their parallelism, and hence there is a double chance of error. Only one face, therefore, should be used from which to do the lining for a given surface. If lines are to be made on all four sides, as A, B, C, and D, and A and B are the working...
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New. Trade paperback (US). Glued binding. 180 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
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Fine. Trade paperback (US). Glued binding. 180 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
