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Turn′stile.

A post with four horizontal arms, which revolve as a person pushes by them.

Turnstile.

Fig. 6808 is a self-registering turnstile, for toll-bridges or other places where fares are to be collected from foot passengers, or it is desired to ascertain their number. The upright shaft on which the stile turns actuates a train of gearing moving a series of indexes which point out the number of revolutions or partial revolutions made by the stile.

The groma of the Romans was the board on a turnstile to show the direction of the ways in a camp.

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