การดู
1:23
gravity clock for mac
1:11
gravity clock
5:59
Gravity Powered Escapement Wheel.... Simple machine lesson
1:33
gravity clock 2
1:33
Brian Law's Gravity Escapement demo on MAC OSX
2:27
On The Clock
0:40
The Deadbeat Escapement Mechanism
10:48
Rechargeable Smart Night Light with Gravity Clock and Dimming
