The S.F. machine made by Heck, 4 Place Voltaire, Paris, was referred to in our first Paris Show issue. We now illustrate the complete machine and also the motor itself. The motor develops 1½ h.p. at 1500 revolutions per minute. It is a well designed and finished little motor, having a silencer of good size strongly supported by a lug on the crank case. The jockey pulley for tensioning the driving belt is pivoted on a lug also cast on the crank case, and the lever is of considerable length, working across a ratchet The spark advance lever is also similarly arranged on a ratchet.
Source: Motor Cycling Magazine, January 1903.