Postscript.
215
were doubtless due to such a slow surging of the solid ground
(see pp. 14 and 130 of this report). That the undulations in
the Leeds tracing were not due to atmospheric disturbances
appears almost certain, both from the character of the in-
dentations as well as from the fact that no other barograph
has recorded them. On the other hand, it is not at all
improbable that the Leeds instrument may, by its con-
struction, be particularly sensitive to earth-shakes. It is of
interest to consider, in connection with the present report,
that the disturbance originating beneath our county was suffi-
ciently intense to cause the ground 170 miles away to be tilted
slowly to and fro for a period of four hours after the event.112
Displacement of the Equatorial in the Observatory, Crowborough,
Sussex.
On November 19th of the present year, just as this last
sheet was going to press, I received a letter from Mr. G. J.
Symons, who was staying with Mr. C. L. Prince at Crow-
borough, requesting me to come down and inspect the
equatorial telescope, which had been shifted on its base by
the earthquake of last year. The Crowborough Observatory,
which I visited on November 21st, is built on to the S.W. side
of Mr. Prince's house, and has the form shown in the accom-
panying plan (Fig. 17), the walls being of massive brick and
stone-work twenty inches in thickness.
The telescope itself is a 7-inch equatorial, resting on a
triangular base, the whole instrument weighing more than a
ton. The triangular base is not fixed, but rests by the whole
weight of the instrument upon three piers, A, B, and C, the
former being stone and the latter hard wood. The piers A
113 One of the most recent instances of earth-tremors caused by a
remote earthquake has been communicated to the Meteorological Society
of Berlin by Dr. Borsch, who states that on August 2nd, when deter-
mining the longitude between Berlin, Breslau, and Konigsberg, the level
of the transit-instrument was so disturbed that the observations had to
be discontinued. Inquiries at Breslau and Konigsberg showed that the
same disturbance had been experienced at both places. The oscillations
were coincident with violent earthquakes in the interior of Asia.—
'Nature,' Nov. 19, 1885. p, 72.