MIDDLEBORO, MA - A memorial service for Donald Brookfield Sr., founder of Brookfield Engineering Laboratories Inc. and a pioneer in the development of viscometer instruments, was held June 25 in Sharon, MA. Mr. Brookfield died May 24 after a long illness. He was 92.

Mr. Brookfield, working with his father Gordon, developed his first viscometer in the 1930s and sold his first dial-reading viscometer in 1934. In 1939, he left a position with the Gillette Co. in Boston to pursue the viscometer business full-time. During World War II the company continued the development of viscometers while contributing to the war effort with technology introductions that included the cathode used in airborne radar, new radio instrumentation and other defense components.