I'd assume that in the 18th and early 19th century "grease" usually indicated some sort of animal fat, the fossil fuel industry not really getting started until the mid-19th century, IIRC. There were some naptha-derived substances in use, I believe, but I don't think that they were used as lubricants generally.
Honestly never crossed my mind that "grease" could be taken to mean anything other than animal fats until DT posted....
A quick Bing search reveals that the melting points of various animal greases varies according what grade of fat and place in the animal it was rendered from. The better stuff has a melting point over 100 degrees Fahrenheit.
Honestly never crossed my mind that "grease" could be taken to mean anything other than animal fats until DT posted....
A quick Bing search reveals that the melting points of various animal greases varies according what grade of fat and place in the animal it was rendered from. The better stuff has a melting point over 100 degrees Fahrenheit.