File:A textbook on mechanical and electrical engineering (1902) (14792016053).jpg

Identifier: textbookonmechan00inte (find matches)
Title: A textbook on mechanical and electrical engineering
Year: 1902 (1900s)
Authors: International Correspondence Schools
Subjects: Mechanical drawing Mechanical engineering Electrical engineering
Publisher: Scranton : International Textbook Co.
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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ffl BRAJKE LEVER l/Vrozj.oHt Irorv.Sca^le6=/ft. -^.. Fi^y iiately following the title page. jo^M syyriTJ^, CLASS y/2 45a9 § U MECHANICAL DRAWING 27 •44. Fig. 3 shows a brake lever drawn to a scale of 3 inches = 1 foot. Owing to its length being too great to beshown entirely on the drawing to this scale, the handle isshown as if a piece had been broken out, the dimension line, 4 feet 7 inches, giving the distance between the two centers Oand O. The lever should be readily drawn from the dimen-sions given. To proportion it properly, where the size ofthe paper does not permit the whole of it to be drawn, pro-ceed as follows: The length between the centers is 4 feet7 inches = 55 inches. The width through O is 2\ inchesand through O 4 inches. Hence, 4 - 2J = If; 1.75= the taper in 55 inches. Measure o^ O A = say, 2 feet. 1 75The width at A may be found as follows: -^ = taper in L inch. -^-^ X 24 = .76 inch, nearly, the taper in 2 feet.5o 4— .76 = 3.24 = ^ r, or the width at A. Now loc

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