ACADEMY 18174 Da Vinci Series Rolling Ball Timer Mechanical Model Kit Era_1933-1953 + Walthers Proto 920-105220 HO Scale

Walthers Proto 920-105220 HO Scale 50' Cushion Coil Car Elgin Joliet & Eastern EJ&E 7001

TIRE ATTACHMENT METHOD: Glued

Interface: Micro USB

laying down N Gauge track can be much

ACADEMY 18174 Da Vinci Series Rolling Ball Timer Mechanical Model Kit Era_1933-1953 + Walthers Proto 920-105220 HO ScaleACADEMY 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