How to Read a Workshop Drawing (Classic Reprint)

HO"i TO READ A ",TORKSHOP DRAWING WHU-JE no one looking at the figure on the left in Fig. 1 has any difficulty in recogniging it as the picture of a pulley, not everybody looking at the other two figllres would recognise t.hat they represent the same thing. It is a fact, however, and it is how a pulley would appear in a workshop drawing. But why should two figlues be drawn when one, apparently, would not only suffice, but besides would be more understandable? As a lnatter of fact it is en.sier, and therefore takes less time to draw the two figures to the right than the one to the left; and what is luuch 1110re ilnportant, it is only by --dravving the pulley as shown. in the two figures that its true shape and size can be ascertained. 'Vho could ten, by eXaInining the left-hand figure, that the pulley ig circular, except he knew it beforehand? It n1ight be narrower than it is high. rrrue, circles when viewed sideway appear oval, and' so it might be guessed that tAbout the Publisher Forgotten Books is a publisher of historical writings, such as: Philosophy, Classics, Science, Religion, History, Folklore and Mythology.Forgotten Books' Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the original format of each page whilst digitally enhancing the difficult to read text. Read books online for free at www.forgottenbooks.org