Download torrent Report on the Great Earthquake of 12th June 1897 Volume 29

Download torrent Report on the Great Earthquake of 12th June 1897 Volume 29

Report on the Great Earthquake of 12th June 1897 Volume 29.cRichard Dixon Oldham

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Author: Richard Dixon Oldham
Number of Pages: 160 pages
Published Date: 05 May 2014
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130574371
File size: 44 Mb
File Name: Report.on.the.Great.Earthquake.of.12th.June.1897.Volume.29.pdf
Download Link: Report on the Great Earthquake of 12th June 1897 Volume 29
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...The middle of this break, therefore, represents I6" on the 12th June. The usual sensitiveness of the photographic paper used at this Observatory has been ascertained by experiments with a steady light, and found that an exposure of about 4" to the usual kerosine burners (of about 4 candle power intensity) used, is enough for action; and with regard to impression of light during the vibration of the magnet, it is found that oscillations of amplitude of 3 divisions of the scale, equal to a displacement of about 28minutesof declination and upwards, are not recorded; the velocity of the speck of light, together with the motion of the paper, a little over half an inch in one hour, precludes photographic action unless the amplitudes are brought within the above limit, and naturally the first impressions produced are at the extreme ends of the amplitude, where the velocity is a minimum. It is only when the vibrations fall to within about 1J divisions of scale, that the paper shows the impression of light in the middle of the curve, that is, where the velocity is a maximum. 10. It is assumed in what follows, that every seismic wave was accompanied by a temporary disturbance of the magnetic circulation. The first wave, which appears to have just commenced the disturbance in the instrument must have passed Colaba at about 5 minutes past 4. The seismic disturbance then seems to have grown in intensity, and about 7 minutes past the hour the increased amplitudes (which by the way, it must be noted, were first performed about a higher zero showing a decreased easterly declination, movement of the curve in the downward direction showing an increase) passed the limit above referred to, and the trace is entirely lost. Immediately after this, ...

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