Let's make it complete: The Federal government put mind-control drugs in the antifreeze, and used the steam from the thermosiphon systems to administer the drugs to farmers, so they would continue working and making cheap food for the masses. As we all know, a fed population is a happy population and not likely to revolt against its government.
In reality, the thermosiphon systems work extremely well if kept clean. The problem is that farmers didn't maintain the systems properly, and all the rust and scale buildup reduces efficiency.
Pressurized pumped systems are much more tolerant of neglect.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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