41. The operator had to keep the mainspring wound up, using a crank on the side. 42. :Most music boxes are powered by a mainspring similar to some mechanical watches and clocks. 43. This restricted the mainspring to the center part of its range, further reducing force variation. 44. He became master of this lodge in 1779, and for twenty years remained its mainspring . 45. Tsai, the Mainspring consultant, agreed that a loose cannon is not helpful in the boardroom. 46. The Slash Factor, once an entertaining sideshow, is now the mainspring of the Pittsburgh offense. 47. The fusee is a specially cut conical pulley attached by a fine chain to the mainspring barrel. 48. The mainspring was wound by the barrel, and turned the arbor to drive the wheel train. 49. During normal winding the bridle holds by friction to the barrel, allowing the mainspring to wind. 50. In watch company terminology, this is often misleadingly referred to as an'unbreakable mainspring '.
