Sag of Belt

—In the location of shafts that are to be connected with each other by belts, as between an engine and a dynamo, care should be taken to secure a proper distance, one from the other. This distance should be such as to allow of a gentle sag to the belt when in motion. A general rule way be stated thus: Where narrow belts are to ‘se run over small pulleys, 15 feet is a good average, the belt having a sag of 14 to 2 inches. For larger belts working on large pulleys, distance should be 25 to 30 feet, the working well with a sag of 4 to 5 inches. Saint Elmo’s Fire.—A name given sailors to a form of glow electrie discharge sometimes appearing under certain weather conditions at sea as a pale blue flame at the tops of the masts or the tips of the spars; the corposant.