Mr. Squire's Meteorological Observation's. 211 



The observations here recorded have been made with great 

 care, and as near the stated times as possible. 



However desirable it may be to institute a general plan 

 for the purpose of barometrical measurement, yet it is clear 

 to every one, that instruments of the very best construction 

 only can be used on such an occasion, with any prospect of 

 success, in this interesting and useful branch of inquiry. And 

 I have moreover to regret, that it is not at present in my 

 power to give to the above barometrical observations that de- 

 gree of accuracy I could wish, for the want of the necessary 

 corrections for the relative capacity of the cistern and tube, 

 and capillary action, &c. It was my intention to have sent 

 you the annual means of the atmospheric pressui'e for the last 

 five years, as obtained from daily observations made at this 

 place during that period ; but these I shall defer till such time 

 as I can with certainty apply to them the requisite corrections 

 and reductions, by a comparison with a barometer of the most 

 approved construction. 



It appears from the highly valuable Essays on Meteorology 

 by J. F. Daniell, Esq., that this gentleman has paid more than 

 usual attention to the manufacture of barometers ; and the one 

 that has been made for the Royal Society under his superin- 

 tendence, is doubtless superior to any thing of the kind known 

 in this country. 



For the more certain verification of the accuracy and good- 

 ness of barometers intended for philosophical experiments, 

 would it not be proper that all such instruments were sent, for 

 a time, to the Royal Society's apartments, for the purpose of 

 comparison with this standard instrument? as from the ra- 

 pid advances and important discoveries that are now making 

 in the long neglected science of Meteorology, this seems al- 

 most as necessary as it is to send chronometers to the Obser- 

 vatory at Greenwich, with the intention of determining the 

 regularity of their rates, and thereby their fitness for ascer- 

 taining tile longitude with certainty. 



I will here just I'emark that on looking over Mr. Weekes's 

 Table Phil. Mag. vol. Ixviii. p. 316. 1 am of opinion that 

 this gentleman's barometrical numbers for Sandwich must 

 be very incorrect; for on comparing these observations with 

 those made at the same time at Leighton Buzzard b}-^ Mr. 

 Bcvan, it appears that Mr. W.'s barometer was in general 

 lower than Mr. B.'s, but at 2 P.M. Mr. W.'s barometer was at 

 29'84', and at 3 it seems to have suddenly iidlen to 29 inches, 

 and there continued to the end of his observations. Now 

 from a comparison of other observations made on the same 

 day in different parts of the country, it does not appear that 

 2 K 2 any 



