Louis Firth Nafis was an American entrepreneur and inventor, best known as the first manufacturer of the standard Babcock milk test bottle.
He consulted with professors Stephen M. Babcock (1843-1931) and Edward H. Farrington (1860-1934)[3][4] at the University of Wisconsin, who had been commissioned to develop a practical standard test for measuring the fat content of milk.
By 1934-1937, his former company still retained its identity as a division of Kimble (with address 23 North Desplaines St.[6]), and marketed reagents for milk testing, as well as glassware.
[1][9] In 1901, Louis Nafis obtained a patent (US684850A) for a tool to verify the accuracy of the graduated scale on the neck of the standard Babcock bottle.
In 1917, the Louis F. Nafis company was awarded a patent (US1261451) for a special caliper to measure the distance between graduations of the Babcock bottle.