143 



REPORT 1867. 



Table XXVII. — Showing the Mean Estlmatccl Force of the "Wind, in Pounds' 

 Pressure on the Square Foot, for each Observation Hour, derived from 

 Six-hourly Observations, taken daily during Seven Years (1860-1866). 



Table XXVIII.— Showing the Mean Estimated Force of the Wind for each 

 Month, in Pounds' Pressure on the Square Foot, as derived from Six- 

 hourly Observations, taken daily during Seven Years (1860-1866). 



Months. 



January 



February . . . . 



Marcli 



April 



May 



June 



July 



August 



September .... 



October 



November .... 

 December .... 



Yearly means 



18G0. 



lb. 



I'I2 



1-25 

 071 

 0"62 

 I-I2 

 0-82 

 077 



o-6o 

 0-54 

 0-69 

 o'S3 

 °'3S 



1861. 



lb. 



0-57 

 072 

 172 

 0-50 

 0-29 

 0-63 

 0-46 

 0-68 

 0-29 

 o'i7 

 0-24 

 0-26 



1862. 



1863. 



lb. 

 0-44 

 0-99 

 0-56 



0-I2 



o-is 

 o"i4 

 o-i8 



0'20 



o'i6 

 0-19 



0*2 1 

 0-23 



lb. 

 0-48 

 171 



o-i8 



0'27 



0-34 



0-50 



0-34 



0-40 

 0-24 

 o'lg 



0'12 



o'i6 



1864. 



lb. 



0-27 



0-25 



0-24 



0-29 



0-23 



0-42 



0-33 



0-35 



0-45 



0-2S 

 0'2I 

 0-27 



1865. 



lb. 



0-32 



0-57 



0'32 

 0'20 

 0-28 

 0-47 

 0-36 

 0-35 

 0-27 

 0-26 



o 24 

 0-29 



1866. MontMy 



lb. 



0-34 

 0-23 



0"2I 

 0-64 

 0"2S 

 0-45 

 0-42 

 0-42 

 0-48 



0-33 

 0*26 



0'27 



lb. 



0-51 

 0-82 

 0-56 

 0-38 

 0-38 

 0-49 

 0-41 

 0-43 

 0-35 

 0-30 



0"26 



0-26 



076 



0-54 



0*29 



o'4i 



o'3o 



0-33 



0-36 



0-43 



The general accordance of the results in Tables XXVIII. and XXIX. is 

 evident, both showing two maxima in February and June, and two minima 

 in April and November. The discrepancy in the amount of force is due to 

 the results in the former Table having been derived from four daily obser- 

 vations of the estimated force during seven years, while the results in the 

 latter have been obtained by taking the means of the daily maximum force 

 recorded by Osier's anemometer during six years. 



