Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 452
s envelope through which the gases, etc., can slowlyescape. The moulds have numerous small crevices or holes for the purpose of letting the gases and6team escape from the material when baked. The moulds when charged and closed tightly are heatedvery gradually, so as to allow sufficient time for… … carefully taken out and placed upright in acrucible, which is filled with sand luted downand gradually raised to a white heat. Atthis high temperature they may be kept forsome time, to give tliem greater mechanicalhardness and strength; they are then coveredup and allowed to cool gently, and…
Mechanical engineering · Mechanics · Engineering
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![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-essaidephysiquep02muss-480-77.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-460-201.webp)
