ping noxiousgases and vapors are carried off. The forms of all essentialparts have been approved in practical working. Magazine buns. The Board of Army Officers designated to examine intothe merits of the different magazine guns have just con-cluded their report and transmitted it to the Secretary… … Oxygen from tbe Air. A method of obtaining oxygen from air, for technicalpurposes, has been recently devised by M. Margis, of Paris.The principle is that of dialysis, or diffusion under pressure.Atmospheric air being forced against a first caoutchoucmembrane by suction, a mixture of about 40 per…
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