Hi Wardner: I've seen various old pieces of electrical test equipment back then myself. A simple square wave generator would test a coil. The output from a set of mechanical points is a simple square wave. A tester only needs a square wave at a very low frequency to equal what might be needed for a coil on a gas tractor engine. That low frequency could give off a growling noise if electrical parts are mounted in a hardwood box as some of the very old test equipment was. I'll bet most on this forum never saw a hand crank phone. When getting an incomming call from an old weak person who could not crank fast enough, our phone would emit a low growling noise... Maybe something like what you are talking about. The hardwood box acted as a great speaker. By the way, Some of the guys would use these old hand crank phones to shock wet ground to help bring night crawlers to the surface. Farm boys ain't dumb when it's time to go fishing... ag ret.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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