elt warranted in calling attention own activity. Prof. Hargrave asserted that a bird’s wound by the action of an electro-magnet on an arma- to the wing’s alternate flexion and extension. Zan- ture connected with the clock weight. In our illus- vrie remarked the change in the angle of incidence… … approximately, 60 square pendulum toward the right, this pin is rocked downward, inches. depressing the lever #f, and The record of motion was obtained by leading fine insulated wires from a bai- lever G, on which it is mounted, and making an elec- I know, to try for a self-recorded diagram of a…
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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)
