Identifier: practicalworksho00blin (find matches)
Title: 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., etc.
Year: 1876 (1870s)
Authors: Blinn, Leroy J
Subjects: Metal-work Workshop recipes
Publisher: Philadelphia : Henry Carey Baird & Co.
Contributing Library: Getty Research Institute
Digitizing Sponsor: Sloan Foundation

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Aaay 6 5 4- 3 21 Let ABED, fig. 67, be the given elbow; draw the line FC;make FM equal in length to one-half the diameter of the elbow,with F as a centre ; describe the arc KL ; divide the arc KL intothree equal parts; draw the lines FH and FI; also the line IH di-vide the section HK into two equal parts, and draw the line FG;draw the line AB at right angles to BC ; describe the semicircleANB ; divide the semicircle into any number of equal parts, fromthe points draw lines parallel to BO, as 1, 2, 3, &c. FOR DESCKIBING PATTERNS. 69
Text Appearing After Image:
Set off the line ABO, fig. 68, equal in length to the circumfer-ence of elbow AB ; erect the linc3 AF, BD and CE; set off oneach side of the line BD the same number of equal distances as inthe semicircle ANB ; from the points draw lines parallel to BD as1,1, 2, 2, &c. ; make BD equal to BG; make AF and CE equal toAJ; also, each of the parallel lines, bearing the same number as1, 1, 2, 2, 3, 3, &c.; then a line traced through the points willform the first section ; make FG and EJ equal to HI; reverse sec-tion No. 1 ; place E at G and F at J ; trace a line from G to J ;make GH and JI equal to PO, fig. 6Y, or to DK, fig, 68 ; take Sec.No. 1, place F at IT and E at I, and trace a line from H to 1, thisforms Sec. No. 3 and 4. Edges to be allowed. 70 PRACTICAL EULES ELBOWS. To describe a Pattern for an Elbow in FiveSections. Pig. 69, _B M

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