Single cylinder horizontal petrol engine mounted on a 4 wheeled trolley. Two flywheels, one either side, no pulley. Galvanised cylindrical fuel tank mounted on a wooden box in front. Box contains a battery and ignition coil. Trolley has cast iron wheels and is designed for pulling by hand. Painted red and grey. Probably a power source for farm machinery. On a brass plate fixed to the cylinder. "Waterloo Boy Gasoline Engine / No. 81491, HP 4 / Waterloo Gasoline Engine Co. / Waterloo Iowa / Patented / August 7 1900, Dec 3 1901, Oct 7 1907 / Other patents pending / Sold by Waterloo Gasoline Engine Co." On each side of the water tank is an oval white transfer with "Waterloo Boy" above an illustration of a small boy wearing a wide brimmed hat.machinery ... engine ... petrol ... metalwork