bag is full of gas. means of which the air inside is transferred back and When the device is applied to a boat, raft, or other When the preserver is to be worn by a swimmer, its construction is modified so that its action is null ex- forth between the upper and lower parts of the cham- large… … a ments, one containing a liquefied gas and the other a combustible powder and a frictionally ignitible prepar- ation for lighting it. The combustion of the powder is the east. an expedient for both liberating the gases and for gene- and the spectacle magnificent, rating additional gas and…
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