oking appar- atus; and many hundreds of human lives have been Then there are many trades and industries, like the and the like, would prove costly and difficult for saved by*its aid. Indeed, on oc~asion a grave catas- making of cordite and other high explosives, as well the manufacture of oxygen on… … element of through a suit- able valve to danger in the the moutt p r e paration; thus. storage piece. The ap- BREATHING MASKS AND HELMETS. paratus some- eylinders are rendered unnecessary These breathing apparatus are stopping of the flooding of the Severn tunnel by the times also includes an extra…
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