. A textbook on mechanical and electrical engineering . e projections is similar to that in theproblem referred to and may be com-pleted as shown on the plate at Fig. 3 {a).This problem requires interedge lines, asin the case of the cube in Fig. 17; moredevelopers, too, are needed than are usedfor preceding problems. Aside fromthese features, the drawing does notdiffer materially from those that have pre-ceded it. After developing the stretch-out, as in previous problems, and drawingthe edge lines and interedge lines at right angles to thestretchout, developers are drawn from the several point
. A textbook on mechanical and electrical engineering . e projections is similar to that in theproblem referred to and may be com-pleted as shown on the plate at Fig. 3 {a).This problem requires interedge lines, asin the case of the cube in Fig. 17; moredevelopers, too, are needed than are usedfor preceding problems. Aside fromthese features, the drawing does notdiffer materially from those that have pre-ceded it. After developing the stretch-out, as in previous problems, and drawingthe edge lines and interedge lines at right angles to thestretchout, developers are drawn from the several pointsindicated in the elevation; viz., E\ D, C, etc., as must be used to terminate each developer on the linecorresponding to each edge or interedge, as the case may this development is completed, the student mayderive some assistance by cutting out a paper model accord-ing to the lines indicated and bending it to conform to theoctagonal prism; he should then understand exactly what isimplied by the operations that have been Fig. 19 PROBLEM 4 tlie curved sui-face of an inter- 26. To developsected cylinder. Fig. 20 is a perspective drawing of the intersected cylinderrequired for this development; the dimensions in Fig. 4 onthe plate indicate the size the draAving must appear thereon. §1G DEVELOPMENT OF SURFACES 29 This problem is very similar to Problem 2, the only differencebeing that it is necessary to project the edge lines to theelevation in order to obtain the points oftheir intersection with the cutting these points developers are drawnto their corresponding edge lines in thedevelopment. The curve traced throughpoints of intersection in that portion of thedrawing is the upper outline of the devel-opment. This drawing being fully shownon the plate at Fig. 4 (cr) and (/;), the stu-dent should have no difficulty in comple-ting the problem. Since the cutting planein this problem is at an angle of 45°, the de- ^^ ^ velopment may be used
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmechani, bookyear1902
