be the sauie size, however much it may berevolved. In this revolution no point changes its height aboveH. Therefore, draw the plan of the prism. Fig. 31, the samesize as that in Fig. 30, onl_> changing the angle the elementsmake with GL the required amount. Then from each cornerof this plan, as… … PROJECTIONS. 93 If the angle the prism made with V and the angle the ver-tical projection made with GL had been given, the principleswould have been just the same, only you would have first drawnit with its axis perpendicular to V, then revolved it abouta vertical axis until it made the required…
Mechanical drawing
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep01muss-247-59.webp)
