What is jury-mast?

Jury-mast is an upright bar used in conjunction with a plaster of Paris jacket to serve as a head support in cases of diseases of the spine.

The jury mast knot is traditionally used for jury rigging a temporary mast on a sailboat or ship after the original one has been lost. The knot is placed at the top of a new mast with the mast projecting through the center of the knot.…

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