d with rack work, sequence of the difference in angle of various parts of the etc., carryiag the cone of light. object glass and up- If, however, we can separate the condensers from the col- per mirror. When the instrument is lectors, and introduce the reflecting surface between, we then have the… … poses of demon- Thus such an attachment to his ordinary lantern was made ment, the image of each stration, which has by Duboscq, at least as early as 1868, as the present writer would be equally bright: is informed by Dr. H. Schellen, the renowned author of and if this were true of each point or…
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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)
