Winslow's Comprehensive mathematics : being an extensive cabinet of numerical, arithmetical, and mathematical facts, tables, data, formulas, and practical . 352 PATTERN CUTTING. sel, and contain one-fourth part of that portion. See Note at theclose of the directions for constructing the lateral portion of No. 1. To construct the Bases for No. — Make A B equal to the transverse diameter of the base, and divide it into fourequal parts, in <?, o,and r; and through odraw a p-Tpendi. ular,C D, of sufficientlength. Make o C,o .D, each equal to one-third of A B, and fromC and D, t
Winslow's Comprehensive mathematics : being an extensive cabinet of numerical, arithmetical, and mathematical facts, tables, data, formulas, and practical . 352 PATTERN CUTTING. sel, and contain one-fourth part of that portion. See Note at theclose of the directions for constructing the lateral portion of No. 1. To construct the Bases for No. — Make A B equal to the transverse diameter of the base, and divide it into fourequal parts, in <?, o,and r; and through odraw a p-Tpendi. ular,C D, of sufficientlength. Make o C,o .D, each equal to one-third of A B, and fromC and D, through eand r, draw C e m,C r n, D e s, D r with D C theradius, and D and Cthe centres, describes C t, and in D n ; also with A e or B r the radius, and e and r the centres, describe in A s and t B n. By 7 2D D D, s D t = 73°.74; trn=106°A. No. 3. — The Lateral Portion. D \ D<; \ d ; , same as for No. 1 and No. 2. IIule. — Draw at,t R, at right angles to each other, and of suf-ficient length; and produce R i sufficiently in the direction v. Make I 3-D2 tf= \tP-\- —, and t a — v/.1507214Z)2 = , and. 64 I BCD D\2 draw fa Make t i = /r -f- — > and draw i in parallel to I W a t. Next, with c f~ \R2 on one blade of the square, and \ 16 the limit of that measure in the point /, the other blade cutting PATTERN CUTTING. 353 the point a, as fc a, draw fc, c a; and produce / c sufficientlyin the direction A. Make t R = F-\—-p-i and draw a R. Make i r = —i—> and draw m r, which will be parallel to a R. Then with a R the radius, and R the centre, describe the arc a v;and with r m the radius, and r the centre, describe the arc m Jc;also with a y the radius, and y the centre, describe the arc a A ;and with m z the radius, and z the centre, describe the arcm C: then will the section A a v Jc m C be the unit measure ofthe pattern, and contain one-fourth part of the side. To construct the Bases for No. 3. Rule. — Make A B e
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmathematics, bookyear
