Besides these observations direct observations of the magnetometer were
made, and the absolute determination of the elements of terrestrial
magnetism attempted.
On the 17th of November, 1882, a severe magnetic disturbance occurred,
lasting from 12 M. until 3 P.M., which in three hours changed the
declination 42'. The same perturbation was felt in Europe, and the
comparison of the observations in the two hemispheres will prove
instructive.
* * * * *
THE ELECTRIC RAILWAY AT VIENNA.
The total length of this railway, which extended from the Eiskeller in
the Schwimmschul-Allee to the northern entrance of the Rotunda, was
1528.3 meters; the gauge was 1 meter, and 60 per cent. of the length
consisted of tangents, the remaining 40 per cent. being mostly curves
of 250 meters radius. The gradients, three in number, were very small,
averaging about 1:750.
Two generating dynamos were used, which were coupled in parallel
circuit, but in such a manner that the difference of potential in both
machines remained the same at all times.
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