INSTRUMENT n.
One who, or that which, is made a means, or is caused to serve a purpose; a medium, means, or agent. Or useful serving man and instrument, To any sovereign state. Shak. The bold are but the instruments of the wise. Dryden.
JACKET n.
A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket. Blue jacket. (Naut.) See under Blue. -- Steam jacket, a space filled with steam between an inner and an outer cylinder, or between a casing and a receptacle, as a kettle. -- To dust one's jacket, to give one a…