ACADEMY 18174 Da Vinci Series Rolling Ball Timer Mechanical Model Kit Era_1933-1953 + increased durability

increased durability

Walthers Mainline 910-30000 HO Scale 85' Budd Large Window Coach Undecorated

including mainline

Interface: Micro USB

TIRE ATTACHMENT METHOD: Glued

ACADEMY 18174 Da Vinci Series Rolling Ball Timer Mechanical Model Kit Era_1933-1953 + increased durabilityACADEMY 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