Posted by Bob on May 26, 2011 at 14:52:25 from (64.255.159.192):
In Reply to: farmall M voltage reg posted by Finnbair2020 on May 26, 2011 at 13:53:35:
The first "block heaters" were, in fact "headbolt heaters".
From WIKI: "Andrew Freeman, a North Dakotan, invented the head bolt heater in 1947 and received a patent for it on November 8, 1949.[4][5] In 1951, Freeman received another patent on an improved head bolt heater.[6] These early heaters replaced one of the engine's cylinder head bolts with a hollow, threaded shank containing a resistive heating element."
Here's a photo of one for a Ford V-8 flathead...
My late Uncle was involved in the North Dakota REA at the time and knew Andy Freeman personally. You can't even IMAGINE what blessing the invention of the engine heater was to those of us who reside on the "tundra"!
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