. A practical workshop companion for tin, sheet iron and copper plate workers : containing rules for describing various kinds of patterns used by tin, sheet iron and copper plate workers : practical geometry, mensuration of surfaces and solids, tables of the weights of metals, lead pipe, etc., tables of areas and circumferences of circles : japans, varnishes, lackers, cements, compositions, etc., etc., 36 PRACTICAL RULES. KEOTANGLB. To describe a Pattern for a Tapering Article, theTop and Base to he a Rectangle, to he in TwoSections. Erect the perpendicular line FE, fig. 34 ; draw the li
. A practical workshop companion for tin, sheet iron and copper plate workers : containing rules for describing various kinds of patterns used by tin, sheet iron and copper plate workers : practical geometry, mensuration of surfaces and solids, tables of the weights of metals, lead pipe, etc., tables of areas and circumferences of circles : japans, varnishes, lackers, cements, compositions, etc., etc., 36 PRACTICAL RULES. KEOTANGLB. To describe a Pattern for a Tapering Article, theTop and Base to he a Rectangle, to he in TwoSections. Erect the perpendicular line FE, fig. 34 ; draw the line AB atright angle to FE; make FE equal to the slant height of thearticle, and draw the line CD parallel to AB; make AB equal inlength to the longest side of the base; make CD equal in lengthto the longest side of the top; draw the lines AC and BD ; makeGH equal in length to the shortest side of the base; make JI equalin length to the shortest side of the top; draw the line HI, also,erect the line KI parallel to FE, C and D as centres, with the radiiHK; desciibe the arcs M and L; draw the right angle lines LBO,and MAN; set off BO and AN equal in length to EH, and drawthe lines OR and NP at right angles to OB and NA; also, thelines RD and PC at right angles to RO and IN. Edges to be allowed. FOB DESCRIBING PATTEENS. 37. 38 PKACTICAL EULES OCTAGON. To describe a Pattern for Tapering Octagon 2op orCover. Erect the perpendicular line GE, fig. 35 ; draw the line AB atright angle to GE ; make FE equal to the Slant height of the ar-ticle, and draw the line CD parallel to AB; make AB equal Lalength to one of the longest sides of the base; make CD equalin length to one of the longest sides of the top, and draw thelines AG and EG, cutting the points AC and BD, G as a centre,with the radii GC and GA describe the arcs SO and PN ; set offQR, and LN equal to AB ; set off PQ, KA, BII and JL equalin length to one of the shortest sides of the base ; draw the linesPS, QT, RTJ, &c., cutting
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Keywords: ., bookcentury18, bookdecade1870, booksubjectmetalwork, bookyear1876
