Appareils photo pour magazines : un chaînon manquant en photographie
16:25
f/0.38 camera lens made with oil immersion microscope objective
16:54
The clever camera code on rolls of film
14:44
Lightning Adding Machine: Simple Mechanism, Complex Origins
21:30
CAE 1002 Gammascint: the Geologist's Secret Weapon
12:39
A motor with no moving parts (sorta)
24:43
The Lever Paradox
16:30
Raoult's law
9:48