ACADEMY 18174 Da Vinci Series Rolling Ball Timer Mechanical Model Kit HO PC Parts Athearn 16120 HO Scale FMC

Athearn 16120 HO Scale FMC 60' Double Door Hi-Cube Boxcar Union Pacific UP 560263

OVRTRAINS 65004 HO Scale FCA 52' Bulkhead Pipe Car CWLX 200023

4GHz Radio (1 set) REQUIRES: Battery Charger

during the remanufacturing process

Truck: Tangent 70-Ton Gould Caboose Roller Bearing

ACADEMY 18174 Da Vinci Series Rolling Ball Timer Mechanical Model Kit HO PC Parts Athearn 16120 HO Scale FMCACADEMY 18174 Da Vinci Series Rolling Ball Timer Mechanical Model Kit The Da Vinci Rolling Ball Timer kit was inspired by a sketch of an escapement mechanism drawn by Leonardo da Vinci. Using the laws of motion and the concepts of gravity and kinetics to measure the passage of time. The mechanism employs precision gears to power a moving platform which in turn propels a rolling ball. Timing speed is controlled by adjusting the weight and balance of