The American 15-30 tractor during “a very grueling test” at the American Engine & Tractor Co. plant in Charles City, Iowa. The principals of the company are on hand, standing behind the four unnamed men on the sled. These include (from left) H.P.G. Coates, vice president and general manager; George Strite and Mr. Wooley, tractor expert. On the tractor is C.E. McCray, superintendent of the plant and designer, along with Mr. Scofield, the gas engine expert of the company, driver.