There is nothing unscientific about "horsepower". The term has a very specific meaning and it directly relates to power output. The only problem is when you do a silly thought experiment like this one and try to compare the power measurement hp to actual "Horse Power". As "Horse Power" is totally and completely variable, you just can't compare it to the power term "hp" except on the most general level.
Which would have been the level that these early engine salesmen used when trying to convince farmers and miners that their engine was better than the horses they were using...
Which would have been the level that these early engine salesmen used when trying to convince farmers and miners that their engine was better than the horses they were using...