MINING
A metallurgist of long standing writes: “It has been known for a long time that small quantities of aluminium, says from 3.5 to 7 per cent., mjxed with copper produces alloys of a brassy or almost gold colour. These alloys tarnish but slowly in either air or water and are ductile and malleable, that is, may be rolled out into sheet or drawn into tensile strength. I have spoken of and shown some of these alloys in lectures quite 40 years ago, and first made acquaintance with them when a student at the Royal School of Mines in the early 70’s of last century. Owing, possible, to the high cost of aluminium up ito (comparatively) a few years ago they have not attracted much notice. They would make good coinage metal for pennies and haltpennies. An alloy of about 7 per cent aluminium and ,93 copper stamps well and takes a fine impression and is a little lighter than, the present aqoy in use.”
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Hokitika Guardian, 1 December 1931, Page 6
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165MINING Hokitika Guardian, 1 December 1931, Page 6
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