were calculated at $5 per speedometer sold in 1909. Unfortunately, Clark was killed while demonstrating the Stewart speedometer in a Packard during the 1907 Glidden Tour #. Stewart acquired Clarks' share of the company. J.K. Stewart Manufacturing Company Due to the need for the blades of clippers & shears to last longer and remain sharp, Stewart worked with Edward Larson to build a heat treatment furnace for tempering steel. In 1906 the two formed the E.A. Larson & Brothers Company to take advantage of the processes they developed to provide die casting for speedometer production as well as other companies in the area. In 1908, E.A. Larson was reorganized as the J.K. Stewart Manufacturing Company. Stewart-Warner Speedometer Corporation Stewart and rival instrument manufacturer, Warner Instrument Company, were in heated legal battles over patent infringements by both parties. All lawsuits ceased when Stewart bought the Warner Instrument Company in 1912. Stewart-Warner Speedometer Corporation was formed the same year by consolidating the Warner Company with the Stewart & Clark Manufacturing Company. Once again the name changed in 1929 to Stewart-Warner Corporation. Stewart Phonograph Company A lover of music, Stewart ventured into the phonograph market in 1915. Eventually becoming a division of Stewart-Warner, the phonograph company expanded to include radios, televisions, and the required accessories such as speakers. Miscellaneous John K Stewart dictated, onto 18 business phonograph cylinders, instructions for the construction of a oceangoing personal yacht. This yacht was built and named The Sialia. Wm. Cooper & Nephews declined the opportunity to purchase a portion of Stewarts' speedometer company, believing the product was too speculative. - Starting in 1908 Stewart Speedometers were installed in Fords Model-Ts. In 1916, Leander H. La Chance, Mrs. Stewart's half-nephew, was president of Chicago Flexible Shaft and in 1910 the company produces its first household appliance the Princess Electric Iron under the brand name of Sunbeam, a brand that still provides appliances today. References Address in Chicago to The Newcomen Society, given by Bennett Archambault, CEO Stewart-Warner Corporation (Oct 24, 1963) Bulb Horn magazine 1907 Glidden Tour Retrieved Dec 31, 2004. Ron Wiley (2003). Old Engines website; Cooper Engines. Retrieved Dec 31, 2004. Sunbeam History of Sunbeam Retrieved Dec 31, 2004. how Susan Crawford, great-grand daughter of Julia P. & John K. Stewart (July 19, 2005) 1870 births 1916 deaths 19th-century American inventors 20th-century American inventors Businesspeople from Chicago People from Hillsborough, New Hampshire 19th-century American businesspeople