. 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., Set off the line HI, fig. 76, equal in length to DBE in fig. 74 ,sot off on the line HI the same number of equal parts as in theline FG ; from the points draw lines at right angle to HI; s
. 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., Set off the line HI, fig. 76, equal in length to DBE in fig. 74 ,sot off on the line HI the same number of equal parts as in theline FG ; from the points draw lines at right angle to HI; set offon each side of HI the same distance as on each side of the lineFG in fig. 75, as 1, 1, 2, 2, &c.; a line traced through the pointswill form the piece to be cut out; when there is to be an edgeturned up, it must be allowed inside of the line traced. The samerule is applied to describe a pattern for a flange for fig. 57 ; makeKI, fig. 76, equal BF, fig. 57, theu proceed the same as describedabove. 78 PRACTICAL RULES OCTAGON OR SQUARE TOP OR COVER. To describe an Octagon or Square Top or Describe a circle, three-quarters of an inch larger in diameterthan a circle that will cut each corner of the article the top orcover is for; set off the squares from B to C ; take one half of thelargest square ; and \with B and C as centres, describe arcs Gand H ; then with A as centre, describe the arc cutting the squareat I and the arc D ; where the arcs GD and HD intersect, draw thelines AE and AF, also the lines BE and CF. rou DESCRIBING PATTERNS. 19 STEAMER COYER. To describe a Steamer Cover. Pig. 78.
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Keywords: ., bookcentury18, bookdecade1870, booksubjectmetalwork, bookyear1876
