56 RECORD AND DISCUSSION OF FORCE OF WIND. 



and, since the force of the wind depends altogether on an estimation, I prefer, in 

 the small number of cases in which the forces 9 and 10 occur, to adopt the num- 

 bers 70 and 80 as the corresponding velocity in miles per hour.^ 



In the following hourly abstract of the anemoraetric observations, the direction 

 is indicated by the initial letter or letters of the compass point, and the force by a 

 number preceding it, according to the scale given above. Any intermediate direc- 

 tions, dividing the compass into 16 points, have been placed alternately in the 

 column of the preceding and following principal direction ; thus two successive 

 entries in the log-book of N. N. E., will be found noted in the abstract as N. E. 

 and N. In this manner the mean directions have in all cases been preserved. 

 These intermediate directions are of comparatively rare occurrence. In a few 

 instances, particularly during the first ten days (of September), there is some doubt 

 as to the true meaning of a blank in the log, all other meteorological observations 

 being duly recorded, whether this indicates a calm or an omission of observation. 

 In these cases, I have likewise left a blank in the record, if not otherwise guided 

 by the abstract given in Appendix No. XII. of the Narrative. The first vertical 

 column in the abstract contains the hour of mean local time. Horizontal dashes 



( ) in the body of the abstract indicate " no observation," and two inverted 



commas (" ) signify the same force and direction as for the hour immediately pre- 

 ceding. The fall of snow (and rain) is also noted. 



' Mr. Sonntag's views on this subject agree with mine; he thinks the forces rather over-estimated, 

 produced by the greater sensation of cold. 



