1837.] 



Meteorological J ournaL 



213 



Applying the corrections due to error of division and capilliary action* 

 the relative indications are as follows : 



For the present I propose to consider the barometer named Gilbert 

 as a standard, liable only to some very small correction for the specific 

 gravity of the quicksilver. On comparing this barometer with that by 

 Harris, (which, as I have already stated, was employed at and after 

 2 p.m. on the 30th) ; when the latter stood at 30,200, it required a correc- 

 tion — 0,207 inches, and, on account of the large bore of the tube, and a 

 small cistern, it should be further diminished by one-twentieth of its 

 indications below that state. This at least is true for the indications at 

 and near 30 inches : for indications near to and below 29 inches, how- 

 ever, (by reason of a sudden contraction in the cistern, whose relative 

 capacity to that of the tube I have no means of determining without 

 destroying the barometer) a much larger amount of correction becomes 

 necessary. Hence, the corrections due to the indications at 6, 7 and 8 

 o'clock are necessarily involved in doubt, and, since any attempt to 

 estimate their value can be but little better than a guess, I have prefer- 

 red omitting them altogether. To render the observations complete, 

 however, I here subjoin a registry which was made at an adjoining 

 house ; having first compared the barometer with, and reduced its 

 indications to, my present standard. 



Barometrical Observations reduced to the Gilbert standard : 

 h. m. 



1836, October 30th at 6.0 28,625 inches, 



The above barometrical indications, as well as those which precede 

 them, are corrected for capilliary action, and are consequently those 

 which belong to an elevation of 27 feet above the level of the sea, and 

 to the various temperatures under which they were taken. 



The thermometrical indications are read ofF from a thermometer by 

 Bate, which was sent out to me from England a short time before the 

 storm ; its indications corresponded exactly with Troughtoris standard 

 at the temperature of 75°, but I had no opportunity of verifying it on 

 he other divisions. 



Madras Observatory. T. G. Taylor, 



Dollond.... ..30,019 



Gilbert .'.30,026 



Differing.. ,007 



6.55 

 7.45 

 8.30 



,285 

 ,285 

 ,725 



h. m. s. 



H. C's Astronomer, 



Longitude.. 5 21 7.7 E. 

 Latitude. ...13 4 8.5 N. 



