Astronomical Instruments of Ignazio Porro (1801-1875)

Details Astronomical Instruments of Ignazio Porro (1801-1875) Astronomical Instruments of Ignazio Porro (1801-1875)

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3301a&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #33.01; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Instrument maker Ignazio Porro is remembered today by the Porro prism system used in binoculars. He also designed and fabricated a wide range of instruments, including astronomical telescopes. An advanced mounting system used oil under pressure to relieve friction. In 1857, his 52 cm (20 inch) aperture refractor was the largest telescope in the world. Helioscopes included polarizing attachments, using unsilvered diagonals and Nicol prisms. Porro made use of his instruments, observing eclipses and discovering a new star in the Trapezium.

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