Early Dynamometer Measured Horses' Pulling Power

Dynamometers gave a way to standardize measurements at horse pulls

At the 1997 Great Lakes International Draft Horse Show and Pull, a team of Belgian horses competes in the Lightweight Class with 3,400 pounds on the sled. The class was won with a 3,205-pound team owned and driven by Neal Slusher of Andover, Ohio, who got the only full pull (27.5 feet) with 3,600 pounds on the sled.
At the 1997 Great Lakes International Draft Horse Show and Pull, a team of Belgian horses competes in the Lightweight Class with 3,400 pounds on the sled. The class was won with a 3,205-pound team owned and driven by Neal Slusher of Andover, Ohio, who got the only full pull (27.5 feet) with 3,600 pounds on the sled. 
Photo by Sam Moore