โ Scribed by C.
No coin nor oath required. For personal study only.
Bronzing Liquid.--Dissolve 10 part.q aniline red and 5 parts aniline purple in 100 parts of 95 per cent. alcohol, in a water-bath ; then add 5 parts benzoic acid, and heat the mixture until the greenish color changes to a light bronze-brown. This liquid, when brushed upon metal, leather or wood, produces a bcautiful bronze effect.--Belyer. Ind. u. Gewerbeblatt.
C. Precaution against leire-damp.--The connection of' mining explosions with low barometric pressures hits long been noticed. In ~he colliery of Seraing barometers have been lately placed near each .f the ventilators, with directions to give the ventilating fans 75 turns per minute in fine weather, 80 turns in changeable weather, and 85 turns in stormy weather.--L'Echo Indust. C.
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