-designed to be carried by miners so that in the event of their being overtaken by fumes from a fire or explosion, they could use it to protect themselves. It contained a chemical substance named Hopcalite which changed the deadly carbon monoxide into the comparatively safe carbon dioxide. It gave protection for thirty minutes against an atmosphere containing half a per cent of carbon monoxide, where a safety lamp would burn.
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The Self Rescuer Breathing Apparatus
-designed to be carried by miners so that in the event of their being overtaken by fumes from a fire or explosion, they could use it to protect themselves. It contained a chemical substance named Hopcalite which changed the deadly carbon monoxide into the comparatively safe carbon dioxide. It gave protection for thirty minutes against an atmosphere containing half a per cent of carbon monoxide, where a safety lamp would burn.
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