Dr. Hammerl, of the Vienna Academy of Sciences, has made some
experiments upon the disturbing influences on the correct indications
of a copper voltameter. He investigated the effects of the intensity
of the current, the distance apart of the plates, and their
preparation before weighing. The main conclusion which he arrives at
is this: That in order that the deposit should be proportional to the
intensity of the current, the latter ought not to exceed seven ampères
per square decimeter of area of the cathode.
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Speaking of steel ropes as transmitters of power, Professor Osborne
Reynolds says these have a great advantage over shafts, for the stress
on the section will be uniform, the velocity will be uniform, and may
be at least ten to fifteen times as great as with shafts--say 100 ft.
per second; the rope is carried on friction pulleys, which may be at
distances 500 ft. or 600 ft. so that the coefficient of friction will
not be more than 0.015, instead of 0.04.
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