METEOROLOGICAL OBSKRVATIONS AT PLYMOUTH. 



169 



Table XXIII. 



Shewing the Times of Morning and Evening Mean Temperature 

 in different Latitudes, and at various Heights above the Sea. 



Name of Place. 



'A 

 I 

 2 



Longitude. 



0) 



1. 



•s 

 X 



P 

 5 



^J 



Ill 



ifi 



rA. 



lii 



Leith 



Plvinouth 



55-56 



50-21 



45-36 



39-57 



6-57 



7-18 



8-33 



3-13 w. 



4- 6w. 

 11-55 E. 

 75- 9w. 



80- E. 

 80-49 E. 

 81-24 E. 



Feet. 

 25 

 75 



36 



1682 

 60 



600 

 400 



near 



48 

 52 



49-28 

 8016 

 74- 5 



81- 



9-13 



8- 



8-41 



8-10 



10-35 



10- 



10-35 



8-27 



7- 



7-52 



7-30 



9-30 



9- 



8-40 



1114 



11- 



11-14 

 11-20 

 10-55 

 11- 

 11- 5 



Padua 



Philadelphia 



Kandy 



Trincomalee 



This table is of much value, since it contains the results of a 

 series of observations on temperature, calculated to establish 

 the two daily periods, the mean temperature of which equals 

 the mean temperature of the twenty-four hours. 



It may be seen by this table that notwithstanding some va- 

 riations occur in the times, yet, as observed by Professor Forbes 

 in his excellent Report on Meteorology, the interval between the 

 morning and evening mean is upon the whole remarkably con- 

 stant, especially when we consider the difficulty of obtaining 

 hourly observations for a great length of time, so as to com- 

 pletely neutralize every casual disturbance. 



Major Ord was led to adopt a two-hourly register in prefer- 

 ence to an hourly register, from a conviction that an equal if 

 not a greater degree of accuracy would be obtained in that par- 

 ticular climate. 



The register was carried on by the intelligent Scots of the 

 98th Native Highlanders, and non-commissioned officers of the 

 Royal Artillery. 



Thus the fine efforts of an hourly register, first commenced 

 and discussed under the direction of Sir D.Brewster atLeith, in 

 the years 1824 and 1825, have been, and will doubtless still con- 

 tinue to be, followed by similar registers, the results of which 

 cannot fail to be of the highest value to Meteorology, as being 

 the only channel through which any specific practical informa- 

 tion can be obtained in this most valuable department of 

 physics. 



Whatever therefore may be the claims of further inquirers 

 on the consideration of the scientific world, it must never be 

 forgotten that Sir David Brewster was the first to obtain an 



