Protohistoire de la Machine a. Mesurer les Cliches Astronmiques

In 1864, the Rutherfurd's machine to measure stellar photographs proved the interest the astronomical photography could provide. The photographical method was developed for the observation of the transit of Venus on the solar disc. In 1875, Brunner built a machine for this purpose; improved by the Henry's brothers, it became the prototype of the machine to measure stellar photographs ten years later.