This section is from the book "American Library Edition Of Workshop Receipts", by Ernest Spon. Also available from Amazon: American Library Edition Of Workshop Receipts.
This is also an alloy of copper and tin, in the proportions of 8 or 9 parts of the former to 1 of the latter. It is a very tenacious metal, easily forged, and possesses a considerable amount of resistance; it is the metal of which large guns were formerly cast, whence the name. In order to make a perfectly uniform alloy, the melted metals should be cooled in the moulds as rapidly as possible. Gun-metal of the above composition has a specific gravity of 8.462; the weight of a cub. in. is 0.304 lb., and its tensile strength 15.2 tons to the sq. in.
The composition employed by the Kellers is-100 of copper, 9 of tin, and 6 of zinc. Fesquet states the proportions adopted by the chief European armouries as follows:-
Copper. | Tin. | |
England...... | 100 | 12.5 |
• • „ • • • • | 90 | 10 |
.......... | 88-92 | 12-8 |
Austria, Bavaria,) Prussia, Russia, Saxony.. .. | 100 | |
10 | ||
Spain ............... | 100 | 11 |
 
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