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Campani, Joseph (Giuseppe). 1635-1715.

Descriptio novi microscopii.

A Dn. Schelstrateno, Vaticanae Bibliothecae praefecto, in literis d. 15 Junii a. 1686 Romae exaratis, communicata. Lipsiae, Prostant apud J. Grossium & J.F. Gletitschium, Typis Christophori Guntheri, 1686. (In: Acta Eruditorum anno M DC LXXXVI publicata, p 371-372.)

"While learning the new profession of lens grinding, Giuseppe worked with his two brothers in the invention of a silent night clock. Presented to Pope Alexander VII in 1656, the clock brought Giuseppe into prominence; and he went on to produce lenses and telescopes whose superior workmanship earned him recognition from such patrons as Archduke Ferdinand II of Tuscanny, Cardinal Francesco Barberini and Giovanni Domenico Cassini at the Royal Observatory at Paris. In 1663-1664 Campani invented the composite lens eyepiece and constructed a telescope with four lenses, consisting of a triple ocular and an objective. In 1664 he developed a lens-grinding machine lathe that could grind and polish lenses without first casting blanks in molds. With it he produced telescopic instruments of great focal lengths that were widely used. Using his own instruments, Campani made significant astronomical observations of the satellites of Jupiter and of the rings of Saturn in 1664-1665 and published the results. Also interested in the microscope, he developed a screw-barrel type of instrument that could be made of metal or wood and permitted greater precision of adjustment than had previously been possible." (Dictionary of Scientific Bibliography)

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