Matteo or Mathieu Campani-Alimenis (born in

Spoleto Spoleto (, also , , ; ) is an ancient city in the Italian province of Perugia in east-central Umbria on a foothill of the Apennines. It is south of Trevi, north of Terni, southeast of Perugia; southeast of Florence; and north of Rome. H ...

Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...

) was a mechanician and natural philosopher of the 17th century.

Life

He held a

curacy A curate () is a person who is invested with the ''care'' or ''cure'' () of souls of a parish. In this sense, ''curate'' means a parish priest; but in English-speaking countries the term ''curate'' is commonly used to describe clergy who are ass ...

Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...

in 1661, but devoted himself principally to scientific pursuits. As an optician he is chiefly celebrated for, the manufacture of the large object-glasses with which Cassini discovered two of

Saturn Saturn is the sixth planet from the Sun and the second largest in the Solar System, after Jupiter. It is a gas giant, with an average radius of about 9 times that of Earth. It has an eighth the average density of Earth, but is over 95 tim ...

's satellites, and for an attempt to rectify chromatic aberration by using a triple eyeglass; and in clock-making, for his invention of the illuminated dial-plate, and that of noiseless clocks, as well as for an attempt to correct the irregularities of the

pendulum A pendulum is a device made of a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate i ...

which arise from variations of temperature. Campani published in 1678 a work on

horology Chronometry or horology () is the science studying the measurement of time and timekeeping. Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. ''Hor ...

, and on the manufacture of lenses for

telescope A telescope is a device used to observe distant objects by their emission, Absorption (electromagnetic radiation), absorption, or Reflection (physics), reflection of electromagnetic radiation. Originally, it was an optical instrument using len ...

s. His younger brother

Giuseppe Giuseppe is the Italian form of the given name Joseph, from Latin Josephus, Iōsēphus from Ancient Greek Ἰωσήφ (Iōsḗph), from Hebrew יוסף. The feminine form of the name is Giuseppa or Giuseppina (given name), Giuseppina. People wit ...

was also an ingenious optician (indeed the attempt to correct chromatic aberration has been ascribed to him instead of to Matteo), and is, besides, noteworthy as an

astronomer An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...

, especially for his discovery, by the aid of a telescope of his own construction, of the spots in

Jupiter Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a Jupiter mass, mass more than 2.5 times that of all the other planets in the Solar System combined a ...

, the credit of which was, however, also claimed by

Eustachio Divini Eustachio Divini (4 October 1610 – 22 February 1685) was an Italian manufacturer and experimenter of optical instruments for scientific use in Rome. The origins Eustachio was born on 4 October 1610 in San Severino Marche, from the illustrious ...

Works

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Life

Works

See also