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tumbler gear

American  

noun

Machinery.
  1. a transmission having gears actuated by a tumbler.


tumbler gear British  

noun

  1. a train of gears in which the gear-selection mechanism is operated by tumblers

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Then the clattering of iron links, as the cables were ranged for letting go, was followed by a whoop of interest, and the ex-salesman popped into sight in the bows, deep in an examination of the tumbler gear that released the big anchors.

From Project Gutenberg