The power in these two out-of-line drives is transmitted by joints. No. 18 is a universal joint but of unusual construction, not as practical as those in No. 17. The joint in No. 19 will only operate when the shafts are placed at the same angle as the angles in the floating tube A, operating between the two driving arms. The placing of the shafts and construction of the tube require great precision.
[Virginia Downward & William M. Clark, 1930]

[Editor’s Note: These out-of-line transmission drives are in the same class as the universal joint models of Reuleaux in the series P-1 to P-5 of the Voigt catalog. Universal joints are used in many power train applications, but the most familiar one is in automobiles to transfer power from the engine to the drive wheels, often in the rear wheel drive vehicles. FCM]

Francis Moon 2005-00-00