The Bull Tractor Co. produced their first tractor in 1913, the lightweight three-wheeled Little Bull. This was a revolutionary design compared to the heavyweight tractors of the time and was much copied by other manufacturers. The Little Bull proved extremely popular, and within a year the company was the biggest producer of tractors in the USA. The Little Bull was followed in 1915 by the more powerful Big Bull, but by this time farmers were finding that the open gears caused problems when dirt got into them and the three-wheeled design could be unstable on hills. The Bull Tractor Co. became bankrupt in 1920 and most tractor manufacturers reverted to four-wheeled tractors.

(Click on images below to enlarge)

Little Bull (serial no. 657) at the Pioneer Power Show, Le Sueur, Minnesota, USA in 2011.

Little Bull (serial no. 910) at Onslow Park Rally, Shropshire, England in 2008.

Little Bull (serial no. 1190) at Bonanzaville, Fargo, North Dakota, USA in 2011.

Big Bull (serial no. 5562) at the Little Casterton Working Weekend, Lincolnshire, England in 2007.

Big Bull (serial no. 5935) at the Great Dorset Steam Fair, Dorset, England in 2005.

Big Bull (serial no. 6887) at the Stuhr Museum of the Prairie Pioneer, Grand Island, Nebraska, USA in 2011.

Big Bull (serial no. 7117) at Pioneer Village, Minden, Nebraska, USA in 2011.

Big Bull (serial no. 11124) at Western Minnesota Steam Threshers Reunion, Rollag, Minnesota, USA in 2011.

Big Bull at the Musee Maurice Dufresne, Azay-le-Rideau, France in 2007. Bull tractors were sold in France by Massey-Harris. Note that both rear wheels on this Big Bull are driven, whereas many have only single wheel drive.


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