Now my French isn't good, and I don't know if there is better word in French for camera, but even after setting the Google language preferences to French and searching with the keywords "Nadar appareil photo", very little is turned up...
I did hit upon another interesting English site though... Now if you had one of these, there might be some real value:
Historically Important Cameras
It is one of the most extraordinary collections I have seen up to now displayed on a site. Especially love this one: