, in a great number of instances, there is a Roman College, Rome, Italy, Father Secchi photographs the proof which has some importance, although it appears at movement constantly going on, from the interior to the ex- sun daily by means of the instrument represented in Fig. 1; first to be a little… … developed, by patiently weighing the pros and cons, times take place over large areas with great rapid- Fig. l-SECCHI'S SOLAR PHOTOGRAPHIC INSTRUMENT, ity : at other times they occur quite slowly, last for until at last a sort of electric spark convulses the a considerable period, and are seemingly…
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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-193-46.webp)
