[2520]. Variable driving friction gear to give a variable speed to the bevil-wheel shaft A by varying the position of the friction pinions as regards the disc B.
[2521]. Variable adjustment for a spiral spring.
[2522]. Adjustable centre-piece or bearing for a spindle or rod.
[2523]. Variable radius hand crank.
[2524]. Variable throw crank pin.
[2525]. Variable motion taken from a revolving cylinder or shaft by a friction wheel, whose angle can be varied.
[2526]. Similar motion taken from a revolving disc.
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