I've got a couple of Monitor Tops and they still work - so I've never has to find gas or convert.
The Methly Chrolide gas is still used commercially and is available for commercial use only. It also used to be used in making leaded gasoline. Also known as - Monochloromethane, Methyl chloride, Artic, Freon 40, R 40, UN 1063, R10, R40, or R48/20
As far as the Sufur Dioxide does - it's still a common gas but not sold for refrigeration. It was known as R23 or R24.
There are some replacement gasses available - but all require a lot of work to install - e.g. changing the oil, the drier, etc.
Both the old gasses are toxic to a degree - but what isn't?
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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