and transversely of the center of one, bore a pin hole. Near a corner of the Endeavors have therefore been made of late to pro- other make a cluster of three pin holes arranged about X-ray shade of the foreign body in question, by means duce stereoscopic X-ray diagrams, and to determine of two… … and a tolerably good image of the hole will be formed The right eye having been closed, the glass scale should be so adjusted by means of the left eye that even at some distance of the point where the rays its black middle line passes through the right-hand meet. Photographers take advantage of…
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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-165-43.webp)
