Scientific American Supplement, No. 421

January 26, 1884

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Author: Various Authors
Published: 1884
Language: English
Wordcount: 31,019 / 101 pg
Flesch-Kincaid Reading Ease: 66.4
LoC Category: Q
Downloads: 504
Added to site: 2005.07.25
mnybks.net#: 10997
Genre: Science
Excerpt

S.]

[Illustration: FIG. 17.--VON BEETZ'S CHRONOGRAPH.]

* * * * *

COPPER VOLTAMETER.

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.

* * * * *

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,

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