asT. H. wants to do. It would require 170 cubic feet of hy-drogen. This scarcelyrequlres comment. T. H. couldeasily accomplish his object by using as a float a flexiblewaterproof bag containing some liquid lighter thanwater,say a hydrocarbon oil of specific gravity 0*7. Acylindrical bag, 6 inches… … would be very minute. As the deposit at the bottom ofthe sea Is in some places,! believe, of a tenacious nature,T. H.ssoundlng rod might possibly stick there, unlesshis float was Inconveniently large. It might be advisa-ble for him to provide for such a contingency by usingthe apparatus represented…
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