What does sand jack mean?

sand jack

Word Rarity Uncommon

Frequency: Zipf frequency 4.29 in modern English

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noun

"After being rolled into position, the span had to be lowered about 4 in. on to its bearings. This was accomplished by means of sand-jacks—a simple arrangement of piston and cylinder—by which movements to very fine limits are obtained by the controlled release of sand from an opening in the base of the cylinder."

sand jacks (plural)

How to pronounce sand jack

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