Sopwith Aviation Company
In December 1914, the Sopwith Aviation Company designed a small, two-seat biplane powered by an Gnome rotary engine, which became known as the "Sigrist Bus" after Fred Sigrist, the Sopwith works manager. The Sigrist Bus first flew on 5 June 1915 and although it set a new British altitude record on the day of its first flight, only one was built, serving as a company runabout.