A new lamp for use in mines has recently been invented. The lamp is placed within a large glass globe, which is air-tight. Between the. lamp and the globe pure air. is enclosed, and when the lamp is lighted,' the air is expanded by the heat. In case the lamp should be so injured as to expose the incandescent filament to the : gases in the mine, the compressed air between the two globes is driven into the broken lamp before the air of the mine can enter. The influx of compreeed air extinguishes the lamp before the explosive air of the mine is able to reach it. The lamp is fed by a single-cell storage battery, which is enclosed in a celluloid case. It will .burn for twleve hours on a single charge, and gives a light of between one and two can-dle-power.
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Bibliographic details
New Zealand Herald, Volume XLVI, Issue 14133, 7 August 1909, Page 4 (Supplement)
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143Page 4 Advertisements Column 1 New Zealand Herald, Volume XLVI, Issue 14133, 7 August 1909, Page 4 (Supplement)
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