[Amps] Dummy Loads & Wattmeters

[Gary Smith]

Reading the threads on this issue leads me to ask the question: other than the calorimeter that Doc Kirkby has suggested, and yes that method is beyond the scope pof most of us hams, how did the early discoverers and users/ appliers of this phenomemom arrive at the the output figures that they did?  By guess or by golly?  Or by mentods we haave come ot ignore?

Just my curious .02.,

73,
Gary...wa6fgi