( (587 ) 



half scale of Beaufort (1 — 6) (Jahrbuch des Norwegischen Meteorol. 

 Instituts, ( Ihristiania). 



Ik Observations of wind performed at Falmouth (Channel) during 

 17 years, 1874—1886 and 1900—1903; the observations made in the 

 years 1887 — 1899 are published in such a way as to be useless for 

 this investigation. 



Observations have been used, made daily six times - , at noon, 4 P.M., 

 8 P.M., midnight, 4 A.M. and 8 A.M. ; the velocity of wind is 

 expressed in English (statute) miles an hour (Hourly readings obtained 

 from the selfrecording instruments etc. London). 



With respect to the force of the wind estimated at Bergen is to 

 be noticed that in this communication these scale-values are regarded 

 not as forces but as velocities, although in reality they are neither 

 one nor the other. According to a recent extensive investigation l ) 

 the ratio of the Beaufort values to corresponding velocities can be 

 indicated by the following numbers 



Beaufort velocity ratio Beaufort velocity ratio 



As the various velocities do not appear in an equal number the 

 total mean out of these ratios would not give a tit factor of reduction 

 for mean BEAUFORT-values ; so a certain weight must be assigned 

 to each separate ratio. For this the frequencies have been used of 

 the 36000 wind-velocities observed at Falmouth calculated for a 

 whole year; in this way has been found for the reduction-factor 1.83; 

 the English measure, miles an hour, can be reduced to m. a. s. and 

 Beaufort scale- values by means of multiplication respectively by 



0.447 and 0.244. 



l ) The Beaufort scale of windforce. 



Report of the Director of the Meteor. Office upon an Inquiry into the Relation 

 between the Estimates of Windforce according to Admiral Beaufort's Scale and 

 the velocities recorded by Anemometers. London, 1906. 



