• WordNet 3.6
    • n jackscrew screw-operated jack
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Webster's Revised Unabridged Dictionary
    • n Jackscrew A jack in which a screw is used for lifting, or exerting pressure. See Illust. of 2d Jack n., 5.
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Century Dictionary and Cyclopedia
    • n jackscrew See jack, 11 .
    • n jackscrew The screw-mechanism forming part of a dental instrument called a screw-jack (which see), for regulating the teeth.
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In literature:

The Indian gazed a moment, then rose quickly, and put on the jackscrew.
"Rolf In The Woods" by Ernest Thompson Seton
Care and common sense are the jackscrews to use in raising fine fruit.
"Three Acres and Liberty" by Bolton Hall
The axle was slightly bent, and a blacksmith had to bring clamps and a jackscrew before the new wheel could be adjusted.
"The Silent Barrier" by Louis Tracy
Beyond this was a low table provided with an arrangement of ropes attached at one end to a post at the other to a large wooden jackscrew.
"The Bradys After a Chinese Princess" by Francis Worcester Doughty
They were then lowered, by levers and jackscrews, upon the cart brought under them.
"Discoveries among the Ruins of Nineveh and Babylon" by Austen H. Layard
A jackscrew is used to raise a weight of 2 tons.
"Physics" by Willis Eugene Tower