![](http://www.alamy.com/thumbs/6/4DF2D63D-8BB7-4527-B9D3-4FD9B20C4D69/2E961W0.jpg)
The Leon Foucault Heliostat, built by Jules Duboscq, 1862.
Medium: albumen print
Size: 2700px × 3623px
Photo credit: © Archive Farms. Inc / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: &, /, 1800s, 1860s, 19th, archival, astronomical, black, century, duboscq, foucault, heliostat, historical, history, instrument, jules, leon, photograph, photography, phtl, science, sepia, white