Factory and industrial management . FIG. 9-10. FRONT AND REAR VIEWS OF THE VANGINOT RESPIRATOR. Tbe view from behind shows the air-accumulator battery, the pressure gauge, and other attachments. The indicating reducing gauge, as its name indicates, lowers thepressure of the air contained in the flasks to an ordinary tension andsupplies the user with a volume of expanded air, which may be fur-ther regulated by means of a so-called regulating valve, supplying agreater or less volume according to respiratory needs. This reducer-recorder is also employed to operate an alarm whistle, warning theres
Factory and industrial management . FIG. 9-10. FRONT AND REAR VIEWS OF THE VANGINOT RESPIRATOR. Tbe view from behind shows the air-accumulator battery, the pressure gauge, and other attachments. The indicating reducing gauge, as its name indicates, lowers thepressure of the air contained in the flasks to an ordinary tension andsupplies the user with a volume of expanded air, which may be fur-ther regulated by means of a so-called regulating valve, supplying agreater or less volume according to respiratory needs. This reducer-recorder is also employed to operate an alarm whistle, warning therescuer of the reduction of pressure and of the approaching exhaus-tion of the compressed-air supply. The moment when this warningshall be given may be regulated at will, but with the ordinary ad- RESCUE APPLIANCES IN FRENCH MINES. 15. FIG. 11-12. AIR-ACCUMULATOR BATTERY, HELMET, AND REDUCING GAUGE OF THE VANGINOT RESPIRATOR. justment the apparatus is supplied so regulated that the whistle willsound when the air supply is within fifteen to twenty minutes of ex-haustion. The respiratory mask with its crest resembles a firemans helmetextended downward and forward so as to enclose the face is strong enough to protect the wearers head from blows or fallsof hard substances. The respirable air contained within the helmetis isolated from the external atmosphere by means of a pneumatictube which can be inflated at will and which, adjusting itself to everycontour of the face, assures most absolute safety so far as air-tight-ness is concerned, while it avoids all harshness of contact. The discharge valve for the exhaled air is proof against any de-rangement. It consists of a simple membrane with large chest of the wearer is entirely free for carrying anotherperson or any large burden. The wearer may
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
