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Treorchy.

Pentre.

MOLYBDENUM ELECTRODES.

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MOLYBDENUM ELECTRODES. A patent has been taken out for the utilisa- tion of the metal molybdenum in the con- struction of the electric arc lamp. Molyb- denum is one of the rarer metals, and its ores, known as yellow lead ore, or wulfenite, and molybdenite, occur in granite and limestone rocks. The latter is found in this country in Cornwall, at Shap, in Cumberland, and parts of Scotland. Hungary, Mexico, and Pennsyl- vania are countries where the former is met with. Molybdenite is very similar in appear- ance to graphite, or black lead, with which it was confounded until the Swedish chemist Scheele, in 1778, demonstrated the difference. Four years later the metal wa,s isolated by Hjelm and named molybdenum, from the Greek molybdos, lead. Presumably the name refers to the former confusion of its ore, molybdenite, with graphite, for the metal itself is very different from lead, being white, brittle, and exceedingly infusible. Hitherto the compounds of molybdenum have proved of little or no practical use, a colouring matter known as blue carmine for porcelain being one of the few applications. It is now proposed to use the metal instead of carbon for the electrodes of the arc lamp. An alloy of 86 per cent. of molybdenum* with 14 per cent. of iron is found to give very excellent results, while 10 per cent. of molybdenum with 90 per cent. of iron is found to give. xery white and brilliant light.

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