A tractor driver and Iowa State Professor J.B. Davidson looking at an Iowa integrating and recording traction dynamometer, mounted on the linkage between the tractor and the piece of farm machinery being pulled. The farm tractor has rubber tires. The…
A tractor driver and Iowa State Professor J.B. Davidson looking at an Iowa integrating and recording traction dynamometer, mounted on the linkage between the tractor and the piece of farm machinery being pulled. The farm tractor has rubber tires. The…
Image of a Caterpillar Fifteen in second speed listing and planting three rows of corn with a Rock Island Three-Row Lister, Milan, Ill. The photograph was taken in July 1930.
Image of a Caterpillar Fifteen in second speed listing and planting three rows of corn with a Rock Island Three-Row Lister, Milan, Ill. The photograph was taken in July 1930.
Three men working on a tractor-drawn Case hay baler in the foreground. A harvested hay field can be seen behind the baler. Residential housing across a gravel road is in the background.
