162 



Abstracts for the Thermometers. 



TABLE IX. — ^Means of the Maxima and Minima of Temperature for periods of Three Months, &c. 



Periods. 



M 

 Max. 



ean of Dail 

 Min. 



y 



Max. and 

 Min. 



Mean 

 Daily 

 Range. 



Mean of Monthly 



,. ,r- Max. and 

 Max. Mm. j^jj^^ 



Mean 

 Monthly 

 Range. 



1841. 

 July, Aug., Sept. 



6°2 



47-9 



5°4-9 



1°41 



72-3 



3°8-2 



5°5-2 



o 



34-1 



Oct., Nov. 



460 



34-5 



40-2 



11-5 



54-8 



22-3 



38-5 



32-5 



1842. 

 Jan,, Feb., March 



430 



31-8 



37-4 



11.2 



49-8 



23-5 



36-6 



26-3 



April, May, June 



61-4 



40-6 



510 



20-8 



71-5 



30-8 



511 



40-7 



July, Aug., Sept. 



65-2 



48-6 



56-9 



16-6 



770 



37-2 



57-1 



39-8 



Oct., Nov., Dec. 



48-4 



37-5 



42-9 



10-9 



59-6 



24-6 



42-1 



350 



The Year 



54-5 



39-7 



47-1 



14-8 



64-5 



290 



46-7 



35-5 



The mean of the monthly maxima and minima for the third quarter of 1841, and for the second and third 

 quarters of 1842, is 0'"2 greater than the mean of all the daily maxima and minima for the same periods. The 

 mean of the monthly maxima and minima in the first and last quarters of 1842, is in each case 0°"8 less than the 

 mean of all the daily maxima and minima for the same periods. 



The mean of the maximum and minimum in each month of 1842 is 0°.4 less than the mean of all the daily 

 maxima and minima in 1842, 



TABLE X. — Monthly Means of the Pressure of Aqueous Vapour. 



Month. 



20''. 



23t'. 



2^. 



5^. 



Mean of the 

 Four Hours. 



1841. 



in. 



in. 



in. 



in. 



in. 



July 



0-343 



0-352 



0-361 



0-373 



0^357 



August 



•376 



•399 



•401 



•402 



•394 



September 



•346 



•384 



•403 



•393 



•381 



October 



•251 



•263 



•269 



-276 



•265 



November 



•207 



•212 



•232 



-231 



•220 



1842. 













January 



•192 



•194 



•200 



-199 



• 196 



February 



•218 



•219 



-229 



-224 



•222 



March 



•224 



•239 



-246 



-241 



•237 



April 



•230 



-261 



-272 



-277 



•260 



May 



•317 



-329 



-348 



-338 



•333 



June 



•345 



•364 



-366 



-366 



•360 



July 



•369 



•388 



-396 



•397 



•387 



August 



•415 



•436 



-443 



•444 



•434 



September 



•348 



■372 



-381 



•380 



•370 



October 



•239 



•249 



•245 



•255 



•247 



November 



•223 



•227 



•240 



•235 



•231 



December 



•280 



•285 



•283 



•278 



-281 



In forming the above Table, only those observations of the dry bulb thermometer were used which had cor- 

 responding observations of the wet bulb. 



In the computations, Dr Apjohn's formula was used approximately, viz., /"=/' — ^ ; 96 being substituted 



for 88 for temperatures below 32°. The values of /' were taken from the Table page xi. Introduction to the 

 Greenwich Meteorological Observations for 1842. 



