Letters to the Editor

Not a machine

| January 2009

In the October 2008 issue of Farm Collector, on pages 27 and 28 there is a picture of a "Common Sense" tractor belted to a "machine."

A machine is a contrivance that does some kind of work. This "machine" is in fact a prony brake, which is used to measure the output of an engine such as the tractor. The belt is driving a cylinder to which is clamped a simple brake. It transmits the torque through the bar to the scale under the end. The torque is then read off as pound/feet (foot-pounds) and can be converted to horsepower.

On page 4, concerning the Junkers opposed-piston engine, the diagram shows a cutaway of a 4-cylinder opposed-piston engine with two crankshafts. The accompanied diagram, though vague, seems to show one cylinder of a sleeve-valve engine with only one crankshaft. The two are entirely different engines. Although it is possible to combine them, each one is complicated enough that I doubt that would be done with any farm machinery.

Paul J. Meketa, 1645 Samedra St., Sunnyvale, CA 94087 


Farm Collector April 16Farm Collector is a monthly magazine focusing on antique tractors and all kinds of antique farm equipment. If it's old and from the farm, we're interested in it!

Save Even More Money with our SQUARE-DEAL Plan!

Pay now with a credit card and take advantage of our SQUARE-DEAL automatic renewal savings plan. You'll get 12 issues of Farm Collector for only $24.95 (USA only).

Or, Bill Me Later and send me one year of Farm Collector for just $29.95.

Facebook Pinterest YouTube


click me