Chevron Transport Corporation of San Francisco recently purchased two Direct Optical Tuning (D.O.T.) units — the latest diesel combustion analysis system designed and manufactured by Megasystems, Inc. of Boca Raton, Fla. and Cleveland, Ohio. These portable units are very compact, measuring only 22 by 20 by 6 inches.

The Chevron units, which feature video and digital displays as well as graphics printers, will be used aboard the company's 80,000-dwt motor tankers William E. Mussman and Kenneth E. Hill. These systems will analyze the diesel generators as well as the main engines.