File:Journal of Asiatic Society of Bengal (1853) (14594674549).jpg

Identifier: journalofasiatic22asia (find matches)
Title: Journal of Asiatic Society of Bengal
Year: 1853 (1850s)
Authors: Asiatic Society of Bengal
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Contributing Library: Natural History Museum Library, London
Digitizing Sponsor: Natural History Museum Library, London

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iesof Barometric observations in the track or neighbourhood of aCyclone could be obtained, together with the necessary data for anaccurate track of the Cyclone itself; and having written to CaptainBiden on the subject, the Hon. Co.s Astronomer, W. S. Jacobs, Esq.was good enough to furnish me with a complete table of his ten-minute readings extending from 8h. 41 a. m. on the 2nd May, tollh. 41 on the 5th; and from these, combined with the track of theCyclone which I was fortunately enable to trace very accurately,having no less than twenty-six logs and reports. (See JournalVol. XXI. p. 283,) the accompanying Diagram which, it will beseen, shows both the vertical height on the Barometric scale, and thehorizontal distance in miles and tenths from Crest to Crest of theBarometric waves in the Cyclone, has been constructed.To understand the plate it will be necessary to observe—1. That, as shewn in the Diagram A. which is from theChart to the Memoir on this Cyclone, above quoted, omitting
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1853.) Geometrical Measurement of Barometric Waves. 79 only the ships tracks, the Cyclone has been accurately trackedfor the day between Noon of the 3rd and Noon of the 4th May,and to 3 a. m. of the 5th May, when its centre must havereached the shore about 30 miles to the Northward of Madras. Wehave unfortunately no inland reports beyond that point, so as toenable us to trace accurately the exact passage of the centre, and wehave thus to assume that its course and rate of travelling were thesame inland as they had been at sea, which I have done in this case—though there is usually some diminution of the rate of travellingon shore—from comparing the veering of the wind, and the rise ofthe Barometer with its previous fall. 2. That from the known extent of the Cyclone, as well as by theindications of the Barometer and Anemometer, the true wind-circlesof the Cyclone do not appear to have reached Madras before 4h. 11p. m. of the 4th, from which time the readings are projected on theDia

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