. 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., AI2 3 4- 6 7 &q|OS Let the circle OH, fig. 51, equal the large pipe, AB, CD, theBranch or Collar; describe the semicircle AEB ; divide the semi-circle into any number of equal parts; from
. 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., AI2 3 4- 6 7 &q|OS Let the circle OH, fig. 51, equal the large pipe, AB, CD, theBranch or Collar; describe the semicircle AEB ; divide the semi-circle into any number of equal parts; from the points, drawlines parallel to AC, as 1, 2, 3, &c. FOB DESCRIBING PATTERNS. 53 Pig. 52. TC C9<M CQto *?li» 03 Set oflF the line ABC, fig. 52, equal in length to the circumfer-ence of the Collar AB ; erect the perpendicular lines AD, BE andCF; set off on each of BE, the same number of equal distances aain the semicircle ; from the points draw lines parallel to BE, a31, 1, 2, 2, &c. ; make AD, BE and CF equal to AC and BD; also,each of the parallel lines bearing the same figures as 1, 1, 2, 2,3, 3, &c., then a line traced through the points will form the pav-tern. Edges to be allowed. 54 PRACTICAL RULES PIPES. To describe a Pattern for a T Pipe at any angle^ theCollar to be Smaller than the Jlahi Pipe, Fig. 53,. Lot CE, fig. 53, be the diameter of the collar, and AB the angle••cquired ; describe the semicircle CDE ; make CF and EII of equallength, with a radii equal to one-half the diameter of the largepipe ; describe the arc FIT ; divide the semicircle into any num-ber of equal parts ; from the points draw lines parallel to AC, aa1, 2, &c. There must be an odd number of lines, as in the dia-gram, so that one of the lines run through the centre of the semi-circle. FOR DESCRIBING PATTERNS. 55 Pig. 54. u- 1 vo O 1 o / ^ •ir / tvj tt / ^ / - - ?y ^ »r> / ,.- / - c» / - .^ ?s^ fa i ^ \ ? - \ c \_1- A o .\ .- . \ -c^ \ ^ <a \. ^ \ . _Jl vO Q- — 1 ^ Set off the l
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Keywords: ., bookcentury18, bookdecade1870, booksubjectmetalwork, bookyear1876
