Bench vices have long been a necessity for serious woodworkers, and most conform to the standard of a fixed and moveable jaw connected via an Acme screw
The vice below is highly unusual. The fixed jaw has a semi-circular insert which can be rotated to grip stock of irregular shape. In place of a vice screw, it makes use of a mechanism in which a toothed wheel engages with a series of holes in the guide rods, basically an early form of rack and pinion (see photo below right), to permit quick opening and closing. Sadly, aside from “Pat Apld For” stamped on the bottom of one jaw, this particular vice has no identifying information, because it is really quite ingenious.
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