Some info on Grease Lamps on Frontier Carpenter.

http://frontiercarpenter.blogspot.com/2011/12/imagine-how-much-we-depend-upon.html

Editor's Note: I used to melt our fat in water to make the tallow. Sometimes changing the water several times after letting it cool. Salt & heavy particles sink to the bottom, leaving the refind tallow on the surface. We lived for 20 years or so without electricity & used tallow candles & fat lamps for lighting. These were the days of early to bed & early to rise.

Keith.