le were noted by the deflections of occupy a position in the center of the tube, being set the magnetometer. % inch apart. When they have become firmly fast- This apparatus was, of course, suitable for experi- ened in place the space between them is wound full ments only, in that a freshly… … other methods are almost sure to result in a bungling, mercial detector, which is due to Marconi, and is tangled mass of stray loops and ends. wonderfully constant, "fool-proof," and ranks next to The wire of which the band is made is No. 36 silk- the barretter or electrolytic detector in…
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