6. Copper, 80 parts; tin, 101⁄4 parts; zinc, 51⁄2 parts; lead, 41⁄4 parts. English bell-metal, according to Thomson. Inferior to the last; the lead being apt to form isolated drops, to the injury of the uniformity of the alloy.
7. Copper, 68, parts; tin, 32 parts.[140] Brittle; fracture conchoidal and ash-grey. Best proportions for house-bells, hand-bells, &c.; for which, however, 2 of copper, and 1 of tin, is commonly substituted by the founders.
[140] Equal to about 4 Cu + Sn.
8. Copper, 72 parts; tin, 261⁄2 parts; iron, 11⁄2 part. Used by the Paris houses for the bells of small clocks or pendules.
9. Copper, 72 parts; tin, 26 parts; zinc, 2 parts. Used, like the last, for very small bells.
10. Copper, 70 parts; tin, 26 parts; zinc, 2 parts. Used for the bells of repeating watches.
11. Melt together copper, 100 parts; tin, 25 parts. After being cast into the required object, it should be made red hot, and then plunged immediately into cold water in order to impart to it the requisite degree of sonorousness. For cymbals and gongs.
12. Melt together copper, 80 parts; tin, 20 parts. When cold it has to be hammered out with frequent annealing.
13. Copper, 78 parts; tin, 22 parts. This is superior to the former, as it can be rolled out. For tom-toms and gongs.
14. Melt together copper, 72 parts; tin, 26 to 56 parts; iron, 1·44 part. Used in making the bells of pendules or ornamental Parisian clocks. For clock-bells.