German engineers reported last fort- night that they had successfully used a piano wire to measure the invisible twisting of the great steel motor shafts which drive the liner Bremen. They attached a taut wire to the shaft, set it vibrating. Nearby they stretched another wire (not attached to the shaft) to the same pitch. So long as the tautness of the two vibrating wires remained the same, they gave the same note. When the steel shaft twisted a fraction of an inch, it stretched or loosened the attached wire immediately changing the...
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