In the early 1400s came the invention of the coiled spring or fusee which maintained constant force to the gear wheels of the timekeeper despite the changing tension of its mainspring.
在15世纪早期，人们发明了螺旋弹簧或均力圆锥轮，尽管它的主弹簧的张力不断变化，但仍能对计时装置的齿轮保持恒定的力。
The test of wireless fusee is an important part of the test of missile detonating controlling system and it play a crucial role for the missile to detonate at the point bound up in advance.
无线电引信机的测试是导弹引爆控制系统测试的重要组成部分，对导弹能否在装定的最佳爆高可靠引爆起着至关重要的作用。
The test of wireless fusee is an important part of the test of missile detonating controlling system and it play a crucial role for the missile to detonate at the point bound up in advance.
无线电引信机的测试是导弹引爆控制系统测试的重要组成部分，对导弹能否在装定的最佳爆高可靠引爆起着至关重要的作用。
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