fiber, as softened by heat, generally be necessary to provide some kind of back- The well known experiment in which the interfer- and its strength is supposedto depend upon this arrange- ground. The entire beauty of the picture will be ment of particles, compacted more or less by the die ence of… … tube, at opposite ends, are inserted small- Fig. 2.-T£STmG THE C0ND1TCTIVITT OF OASES. is abundantly vouched for, but the rea- er rubber tubes for changing the gas in son of it remains to be explained. Mani- festly if wire can be rolled from cold bars with such the flexible tube. Each of the small…
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