Wrench
A tool having jaws, adjustable or fixed, for gripping nuts or the heads of bolts, to turn them. There is a great variety of these implements, but those made from a piece of round twisted steel, with fixed and loose jaws and nut, are perhaps the best for general purposes, especially in the foundry. The Acme Wrench is of this description, and is defined as follows: 1st. Being made of only four pieces of steel, where other wrenches are composed of from seven to nine pieces, the wearing qualities are obvious. 2d. It has no handle to get loose or soak with oil. 3d. Having two slides, it is very much stronger. 4th. The thread in the nut is about twice as long as in the ordinary wrench; consequently there will never be the same amount of play in the slides, or stripping of thread. 5th. The jaws open one eighth wider than any other wrench of corresponding size. 6th. It is steel, and the jaws are hardened.
Written Impressions on Cast Iron.--See HANDWRITING IMPRESSIONS ON CAST IRON.