The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . aw through 1 in the base abroken and dotted line parallel to the ground line; and at anyconvenient distance from the elevation a second broken anddotted line parallel to the cutting plane 7, 10. From thepoints in the plan 6, 7, 8, 9, 10, I draw perpendiculars to thenew line through 1. These perpendiculars measure the hori- Chap, m.] THE DEVELOPMENT OF A PYRAMID. 81 zontal distances of the points from a vertical plane through 7, 8, 6,
The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . aw through 1 in the base abroken and dotted line parallel to the ground line; and at anyconvenient distance from the elevation a second broken anddotted line parallel to the cutting plane 7, 10. From thepoints in the plan 6, 7, 8, 9, 10, I draw perpendiculars to thenew line through 1. These perpendiculars measure the hori- Chap, m.] THE DEVELOPMENT OF A PYRAMID. 81 zontal distances of the points from a vertical plane through 7, 8, 6, 9, 10, draw perpendiculars to and heyo7idthe parallel line, and make the portions beyond the line just aslong as the corresponding distances last referred to in the will thus determine the points 7, 8, 9, 10, 6, and by connect-ing them you will have the full size of the section^ shown at (a).In order to develop the lateral surface, we must find the truelength of the edges of the pyramid, both the parts cut off, andthe full length. This is done by means of the perpendicularand inclined lines on the left near (^). The lines are put off by. Fig. 67. themselves to avoid confusion. The perpendicular measuresthe altitude of the entire pyramid. The inclined linesrepresent the edges of the pyramid, which are supposed to beswung round the altitude line till they are parallel to the sideplane. Thus the distance from V to the foot of the perpendic-ular is equal to 0 1 in the plan ; and 0 V gives the full le^igthof the edge 0 1, 0 1. From 6 a line is brought along by theT-square to 6, and then we have the distance 6 1, as thetrue length of the edge between the point 6 and the point all the true lengths are found. At (c) we have the development of the surface supposed to 82 THE SECOND, OR MIDDLE YEAR. [Chap. m. be cut open along the edge 0, 10, 5. It is constructed thus:Draw 0 5, Fig. (c) equal to 0 5, Fig. (6), and make 0 10equal to 0 10^. Next determine the position
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmanualt, bookyear1906
