Brazing hearth for bicycles- veering back into safety from home made gas torch....

[pebbleworm]

In the 19th century bicycles were often made on a brazing hearth or furnace running off of city gas, similar to small bronze furnace. There are some instructionsin, and a good picture on the cover of Bicycle Repairing from 1896-
http://books.google.com/books?id=8t...Q6AEwAQ#v=onepage&q=bicycle repairing&f=false
Poke through Google Books or Archive.org for more information. Bottled gas can come out under a lot of ptressure from what I remember from working in a mom and pop art foundry decades ago...