Don Brookfield Sr., founder of Brookfield Engineering Laboratories, Inc., Middleboro, MA, passed away May 24 away after an extended illness.      A graduate of MIT, Mr. Brookfield first came across viscometers when he and his father, Gordon W. Brookfield, were planning to buy one to measure the fluid and physical characteristics of synthetic resins. He told his father, “I can build a better one,” and by 1934, Mr. Brookfield had sold his first working dial reading viscometer. By 1939, he was d...