Robert-Aglaé Cauchoix

Robert-Aglaé Cauchoix (24 April 1776 – 5 February 1845) was a French optician and instrument maker, whose lenses played a part in the race of the great refractor telescopes in the first half of the 19th century.

At first Cauchoix produced a wide range of scientific instruments including barometers and micrometers, but he soon specialized in optics, making spherometers and objectives.

In the Royal Observatory, Greenwich an 1838 instrument named the Sheepshanks telescope includes an objective by Cauchoix.

In 1831, Cauchoix made a 13.3 inch (almost 33.8 cm) refractor for the Irishman Edward Joshua Cooper, who used it to observe Halley's Comet in 1835 and a solar eclipse in 1836.

[6][2] In 1829, Cauchoix made an 11.75 inch lens for a French customer, but sold it to the British astronomer James South.

Observatory of the Collegio Romano in 1852. Number 4 indicates the part of the building that accommodated a telescope by Cauchoix.