Bell metal metal used is a high-tin alloy of copper and tin with approximately a 4:1 ratio of copper to tin (78% copper, 22% tin). This is a much higher tin component than that used in statuary bronze. A range of percentages of tin content can vary from 20 to 26%, depending on the founder who has arrived empirically at their own alloy ratio. It has been found that increasing the tin content increases the decay time of the bell strike, thus making the bell more sonorous. Taking into consideration overall properties, such as tensile strength, hardness, wear resistance, cast quality, sound,
Sundown Tin and Copper Mine Sundown Tin and Copper Mining Company (N.L.) which erected a 10-head battery driven by a suction-gas plant, and built two fines dams. No work had been done for some time on the tin portion, but some had been going on for copper. In 1915 a calciner was erected, together with "another" Wilfley concentrating table and a Berdan crushing pan, and a new shaft was sunk on the tin deposit. The new tin shaft had poppet legs erected over it in 1916, and a 16 hp Tangye winding engine and vertical boiler were installed. That year 69.5 tons of tin and