31. It uses a universal joint in the center that allows the wheels to move independently of each other. 32. The Sanders Teacher was an aircraft with control surfaces fitted to the ground by a simple universal joint . 33. Power was transmitted by a long shaft with universal joints to the three-speed sliding-gear manual gearbox with reverse. 34. The birdies sit on a universal joint and thus will point in the direction of the relative wind. 35. Drive is taken by propeller shaft with universal joints to a live axle, the actual drive being by Austin-Sankey. 36. They are often found in impact sets since they can be built sturdier than a common universal joint socket. 37. NOTE : The reference for measuring angles of input and output shafts of universal joint are mutually perpendicular axes. 38. Christopher Polhem of Sweden later re-invented the universal joint , giving rise to the name " Polhemsknut " in Swedish. 39. There is a universal joint in the handle of the machine, and any one can soon learn to use it. 40. The transmission between the motor and the rear axle was by a shaft fitted with two Hardy Spicer universal joints .
