JOURNAL 



OF THE 



ASIATIC SOCIETY, 



No. III.— 1851 



On the Comparative action of the Marine and Aneroid Barometers 

 and Simpiesometer in Cyclones. — By Henry Piddington, Pre- 

 sident of Marine Courts. 



The Aneroid Barometer has justly excited much interest amongst 

 scientific and nautical men, and its performances on long voyages have 

 been, I believe, generally well spoken of. Some registers of the com- 

 parative action of the Aneroid and Mercurial Barometers and Simpie- 

 someter from England to Calcutta have been sent to me and the results 

 are certainly most creditable to the new instrument. 



Dr. Buist of Bombay has also published some interesting experi- 

 ments on the performance of the Aneroid when carried to the Neat's 

 Tongue, an elevation of 1000 feet, which are also most creditable to 

 its performance.* 



But the registers above alluded to are registers of fine weather 

 voyages, with nothing more serious than one or two of the usual 

 Westerly gales off the Cape, and in Dr. Buist' s experiment the temper- 

 ature, it will be recollected, decreased as well as the weight of the 

 atmospheric column. We have as yet no published account, that I am 

 acquainted with, of the comparative action of the Aneroid and Mercu- 

 rial Barometers and Simpiesometer in great and sudden falls, at high 

 temperatures. 



* Simpiesometers are spoken of in the note, but we have only the comparison 

 with the Barometers given. 



No. XLVI.— New Series. 2 f 



