Model carriage body, made by George Adams, Fleet Street, London, 1762.
This carriage body forms part of the inclined horse-way, apparatus made by George Adams for King George III, to imitate the motion of carts and carriages bearing various weights on roads of various inclines. A hay cart was placed on a cobbled 'horse-way', which has a channel cut to imitate a rut. The inclination of the horse-way could be varied, as could the diameter of the wheels and the weight in the cart. The weight needed to keep the cart stationary was a measure of the efficiency of the wheels.