No startling increases in traction or traction efficiency are envisioned for the near future by Mr. O'Harrow for tractors operating on the usual surfaces; only with a few extreme conditions will large-scale improvements be made.
He reached this conclusion after an analysis of tractor operation on many different surfaces. He discovered that to attain sufficient traction to transmit large horsepowers at a comparatively low speed - and at high efficiency - is an extremely complex job.
