t illustrates the action of a be done with the simple air pump recently described form of vacuum brake now extemsively in use; the in these columns. The apparatus required for the vac- weight representing the brake. uurn experiments cost lessthan the pump. It consists The disruptive power of… … BELL IN VACUO. tied over the open end of the chimney, asshown in Fig: : ber large enough to cover the fish globe, a plain disk of 4, When the air is exhausted from the chimney, the wood as large as the rubber, two 8 in. pieces of five-six- bladder, if thin enough, will burst with a loud report: .…
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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-437-71.webp)
