Adams-Farwell was an American automobile and aircraft engine manufacturer that operated during the early 20th century, particularly in the first two decades. The company, founded by Herbert Adams and Ray C. Farwell, gained recognition for its innovative rotary engines. Adams-Farwell’s rotary engines were known for their unique design, featuring a stationary crankshaft with the entire engine rotating around it. This design allowed for smooth operation and efficient cooling. The company initially produced automobiles, including the Adams-Farwell “50”, a distinctive five-passenger touring car, but later shifted its focus to rotary aircraft engines during World War I. Despite early success, Adams-Farwell faced financial challenges and closed its doors in the early 1920s. While relatively short-lived, the company left a mark in the history of early American automotive and aviation engineering with its pioneering rotary engine technology.