. Cyclopedia of architecture, carpentry, and building : a general reference work .... will be equalboth in plan and elevation. Therefore to obtain the envelope ordevelopment, use AB or AC as radius, and with A in Fig. 13 ascenter, describe the arc 1 -1. From 1 draw a line to A and start-ing from the point 1, set off on the arc 1-1 the stretchout or num- 19 12 TINSMITHING her of spaces contained in the circle DEFG in .Fig. 12, as shownby similar figures in Fig. 13. From 1 draw a line to A. ThenA-1-7-1 will be the development of the right cone of Fig. 12. Suppose that a frustum of the cone is de
. Cyclopedia of architecture, carpentry, and building : a general reference work .... will be equalboth in plan and elevation. Therefore to obtain the envelope ordevelopment, use AB or AC as radius, and with A in Fig. 13 ascenter, describe the arc 1 -1. From 1 draw a line to A and start-ing from the point 1, set off on the arc 1-1 the stretchout or num- 19 12 TINSMITHING her of spaces contained in the circle DEFG in .Fig. 12, as shownby similar figures in Fig. 13. From 1 draw a line to A. ThenA-1-7-1 will be the development of the right cone of Fig. 12. Suppose that a frustum of the cone is desired as shown byHICB, Fig. 12; then the opening at the top will be equal to thesmall circle in plan, and the radius for the pattern will be equal toAI. Xow using A in Fig. 13 as a center with AI as radius, describethe arc III, intersecting the lines lA and AI at II and I respective-ly. Then II-1-1- 7-1 will be the development for the frustumof the cone. When a right cone is cut by a plane passed other than parallelto its base, the method of development is somewhat different. This.
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