Instructions for Collecting Testing Melting And Assaying Gold With a Descript

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Instructions for Collecting Testing Melting And Assaying Gold With a Descript
Edward N Kent
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The stopper (e) is to close either of these pipes when not in use.
There are two sand-baths, one (c) for retorts, and one (d) made double, for evaporations.
The dome is lined with fire clay, and is used when a great heat is required.
The whole furnace is made in the most careful manner, of strong and durable materials.
For obtaining the greatest heat which can be produced by the above furnace, a double bellows (Fig. 16) should be connected with the small pipe at the bottom of the furnace, by me
...ans of a bent iron pipe, formed so as to raise the bellows a few feet from the floor.
For melting gold, and other metals, good crucibles are required. Of these there are different kinds ; those most . Generally used for metals are the Hes- \ / sian. (Figs. 17 and 18. ) These cruci- bles are imported in nests, and may be had of different sizes, in shape either round or triangular. They are gene- rally without covers, and as a substitute for these, a smaller crucible inserted within a larger one may be used.


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