Abstract
ONE of the most irteresting features of the forty fourth annual report of the Deputy Master and Comptroller of the Mint just received is the corn parison of the melting costs according s coke or coal gas is used as the fuel. The former was used up to the year 1909, but has since been replaced by the latter. Although the gross out turn was 1197.7 tons in 1909, as against 1957.9 tons in 1913, the records are comparable, since the proportion of bronze and nickel bronze—which require higher temperatures for melting than gold and silver—was nearly the same, viz., 563 per cent. in the earlier and per cent. in the later year. The comparison is remarkably in favour of coal gas firing, since there is a gross saving of 22.44 shillings per ton of bars, or 27.3 per cent. of the total charge in 1909. Moreover there is a saving under each item of expense, viz., fuel, crucibles, and wages. It is stated that “side by side with this economy there has been a marked increase in efficiency both in regard to the output per furnace and per man, as well as many minor economies, such as the disposal of ashes, handling of fuel, and a great reduction in the weight of sweep to be dealt with”.
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C., H. Metallurgy at the Royal Mint . Nature 94, 322 (1914). https://doi.org/10.1038/094322b0
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DOI: https://doi.org/10.1038/094322b0