Mystery Gravity Driven Incline Rolling Clock -No Spring No Battery Never Wind It | eBay
homework and exercises - Cylinder rolling down an inclined plane held by a string - Physics Stack Exchange
Incline Gravity Clock: powered by gravity this clock has no batteries or mainspring- however, once each day the clock must be picked up and placed back at the top of the ramp. :
Dent Inclined Plane Clock, For Charles Frodsham | 599741 | Sellingantiques.co.uk
Lot 238 - A 'rolling drum' inclined plane mystery
Solved A ball is launched up a ramp by a spring as shown in | Chegg.com
SWISS INCLINE PLANE CLOCK IMHOF GRAVITY ROLLING CLOCK & STAND - BROKEN for Parts | #1933057607