Other
Scientific paper
Jul 1895
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1895natur..52..223h&link_type=abstract
Nature, Volume 52, Issue 1340, pp. 223 (1895).
Other
Scientific paper
SOME interesting readings of the bifilar pendulum, designed by Mr. Horace Darwin for measuring movements in the earth's surface, were made here at noon on the 9th inst. This instrument, which indicates oscillations in a north and south direction, was erected in March of last year, and daily observation of it has since been carried on, the scale being read off each minute, from five minutes before to five minutes after Paris noon. On the 9th inst. nothing unusual was noticed during the first seven readings, these being all practically the same; but on putting my eye to the telescope for the eighth, I at once noticed that during the interval of less than a minute since the preceding reading, the mirror had rotated considerably about its vertical axis, the normal having moved towards the north, the difference between the seventh and eighth readings being no less than 7.6 mm. of the scale. An immediate examination of the lamp-stand showed it to be perfectly firm. After the regular daily readings were completed, others were made at intervals of generally two minutes, for half an hour after Paris noon. These showed two quite conspicuous oscillations of the mirror during its return to its original position, which it reached about thirteen minutes after noon. It continued to move beyond this point towards the south, till at oh. 31m. Paris mean time it was 4.1 mm. south of the point at which the scale was first read off. Later readings in the course of the day showed that it was still moving slowly to the south, but no further oscillations were recorded. In the evening, when the mirror appeared to have come to rest, the sensitiveness of the instrument was tested, and with this the column headed ``Tilt of mirrorframe'' in the following table has been computed. The positive sign indicates a tilt to the north.
No associations
LandOfFree
The Bifilar Pendulum at the Royal Observatory, Edinburgh does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Bifilar Pendulum at the Royal Observatory, Edinburgh, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Bifilar Pendulum at the Royal Observatory, Edinburgh will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1511603