Quote Originally Posted by E. von Hoegh View Post
You wind up the clockwork. The clockwork train turns a tiny regulated generator which supplies 2.7 volts to your LunaPro. That's about as close as you can come to a clockwork lightmeter.
There could also be a gear train which, when you line a pointer up to the needle, turns the exposure calculator to show the setting.

I imagine some kind of Steampunk-looking gizmo with lots of brass gears and stuff. Sort of like an Argus C3 on steroids.

Maybe something like this: