s object is to enable the teacher so to arrange passes into the slag, and in this manner the metal is revolve by turning the gears, G and G2, by means of the the clock as to indicate, by the stroke of a hammer upon purified. It is generally held that molten iron cannot lever, L, which works with a… … The patent for this invention was granted to Thomas ble, every machine-shop in our country may easily man- The engraving represents a perspective view of this in- R. Hopkins, of Petersburg, Va., August 23, 1859. ufacture its own steel. vention. The wheel, A, is so connected with the clock-…
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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-essaidephysiquep02muss-480-77.webp)
