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[–] TheHalfstache 0 points 3 points (+3|-0) ago 

The whole point of Imperial units was that you could do rough measurements without any special equipment. For temperature, you've got the freezing point of fresh water at 32 and the freezing point of brine at 0. The distance between those two points can be used to mark 64 and also 96 degrees, 96 being body temperature, giving you a thermometer that's not perfect but good enough in most respects.