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Updated: May 25, 2025
A blowpipe may also be used with good effect, as shown in the above engraving, and in many cases it is preferable and much easier to manage. In some cases the direct contact of the flame would spoil the articles to be heated, and instead of the arrangement mentioned, a tube of iron, fireclay, or other suitable material is heated, and the articles are passed through it.
For heating blanks for stamping, the furnace bar-burner is perfectly suited, and in this work the chute supplying the blanks to the machine should be made of two fireclay sides, with an opening for the flame between the chute and flame being placed at a sharp angle, to prevent risk of the blanks sticking or overriding each other.
To go into the chemistry of coal is quite sufficient to take up more time than I have at my disposal this evening, therefore I will briefly touch on a few of the main points. Coal gas is made, as you are all aware, by heating coal or cannel, which is the special form of coal most valued for the purpose, on account of the high quality of gas it produces in cylindrical fireclay retorts.
The furnace is covered with a removable slab of fireclay, N, which is provided with one or more vents, n, for the escaping gases. The space between the carbon plates constitutes the working part of the furnace.
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