Items related to Elementary course in mechanical drawing for manual...
Elementary course in mechanical drawing for manual training and technical schools Volume 1; with chapters on machine sketching and the blue-printing process - Softcover
Synopsis
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. 1904 Excerpt: ...Problem 25. To begin the mechanical drawing put the name of the draftsman in the usual place at the left end of the sheet, also place the date, pencil a border of the usual size, and submit the sheet to the inspector for a starting signature and date. BORDER Mark the three projection planes respectively H, and V, and SV, according to their positions. These letters designating the planes are to be vertical, % in. tall, and geometric in style. See alphabet No. 3, plate of standard lettering, Figure 41. They are to be placed within the outlines of the planes, but so as to be outside of the outlines of the object when these latter shall have been drawn. Letter the horizontal axis of projection A B, placing the letter A at the left end of the line. Letter the vertical axis C D and the intersection of the axes E. These points should be similarly lettered in each of the succeeding problems as long as the axes are used. Make each letter designating a corner of the projection planes, a capital, ys in. tall, in regular freehand shape, and placed uniformly 1/16 in. below and to the right of the point to which it belongs. Where as in this case several letters are situated along the same line, even although widely separated, horizontal lettering lines should be drawn so that the letters may be similarly placed and of equal height. Complete the lettering of the planes of projection as shown in Figure 70. Next draw the views of the object. Centrally upon H, the horizontal plane. of projection, lay off a rectangle to represent the top view of the prism. Since the rays of light from the object to the eye, forming the projection lines are parallel, they must be as far apart where they pierce H as where they start from the object, and therefore the rectangle drawn on H to rep...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 1130161420
- ISBN 13 9781130161427
- BindingPaperback
- LanguageEnglish
- Number of pages56
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