Foulis played in the
1897 U.S. Open held at
Chicago Golf Club in Wheaton, Illinois, where his brother
James was the head professional. He scored rounds of 86-87=173 and tied for eighth place with
Horace Rawlins and
H. J. Whigham. None of the three competitors won any prize money. In 1921 David became the professional and greenskeeper at the Hinsdale Golf Club in Chicago where he remained until his retirement in 1939. Foulis and his brother James were the proprietors of the J & D Foulis Company of Chicago, producing golf clubs and "American Eagle" golf balls until 1921.
Golf flag support invention He was the inventor of the "golf flag support" and received a patent on 5 April 1912 for the invention.
Mashie-Niblick invention David and his brother James played a significant part in the evolution of golf equipment. They invented the bramble patterning for Coburn Haskell's new rubber-cored ball. In response to the demands of the new ball they developed the "mashie-niblick", the modern 7-iron, which fell between the traditional
mashie (5-iron) and
niblick (9-iron), and patented the design. ==Family==