Looks to me like a simple "Class 2" Lever. Ref: http://plaza.ufl.edu/luzmaria/LEVERS/class2levers.html
Actual tongue weight is the weight measured on the scale x the ratio of the distances between the fulcrum (deadman) and the measuring device. If the tongue were on the measuring device it would be 100% of reading on scale. If on the Fulcrum, 0%. Anywhere between is the ratio of the two distances. If it were in the center it's be 50% of the reading. If ¼ distance from fulcrum, 25%. If ¼ the distance from the scale, 75%.......all "rough order of magnitude" since exacts would include resistances at both ends of the bar and the weight of the bar and all that stuff.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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