Sorry. It was steam produced by coal fired boilers. Our coal here in NW New Mexico is low sulfur (relatively), but very high in ash content. That leads to some very high maintenance, by the way.
No doubt! Low sulphur or not, coal is a dirty, messy fuel. Water and gravity was nice

Everybody that has one should run some ice through it every six months or so. We dump the ice maker down it. Get rid of the stale ice and cleans/sharpens the disposal at the same time. Yes, sharpens the blades. They don't work the same way as knives or food processors. They grind more than cut. Ice sharpens them as well as cleans the gunk outta the grinding surfaces. Also a 1/4 cup of baking soda in a gallon of water dumped down it when it's of an allowed to sit for about five minutes then rinsed out while it's running about once a month will do away with any funky odors. Hey didn't know I was a garbage disposal expert did ya?