. 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., J4 PRACTICAL EULES RECTANGLE BASE WITH A CIRCULAIlTOP. To describe a Pattern for a Tapering Article, theMase to he a Rectangle^ and the Top a Circle, to hein Two Sections. Erect the perpen
. 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., J4 PRACTICAL EULES RECTANGLE BASE WITH A CIRCULAIlTOP. To describe a Pattern for a Tapering Article, theMase to he a Rectangle^ and the Top a Circle, to hein Two Sections. Erect the perpendicular line DO, fig 33 ; draw the line AB atright angle to DC; make CE equal to the Slant height, and drawthe line FG parallel to AB; make AB equal in length to thelongest side of the base; make FG equal in length to one-fourth the circumference of the top; draw the lines AF andBG ; make CK equal to one-half the shortest side of the base ;erect the line LG parallel to EC, F and G as centres, with theradii KL. Describe the arcs I and H; draw the right angle linesHBN and lAM; set off BN and AM equal in length to CK, anddraw the lines MD and ND at right angles to MA and NB, D asa centre with the radii DE, describe the arc OED. Edges to be allowed. FOR DESCRIBING rATTKBjTS,- r- , 36\ • M Pig. 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
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Keywords: ., bookcentury18, bookdecade1870, booksubjectmetalwork, bookyear1876
