Section III, 1918 



[131] 



Trans. R.S.C. 



A Comparison of Anemometers under Open Air Conditions 



By a, Norman Shaw, D.Sc. 



Presented by Professor L. V. King, D.Sc, F.R.S.C. 



(Read May Meeting, 1918) 



The following is an abstract of the paper read before the Royal 

 Society of Canada on May 23rd, 1918. 



These experiments were performed with the same apparatus as 

 that used for the meteorological observations in connection with Dr. 

 L. V. King's Acoustic Surveys at Father Point in September and 

 October, 1917. For an explanation of the methods and a description 

 of the instruments employed, reference should be made to the articles 

 by Mr. J. Patterson and the writer, which are included in Dr. King's 

 Report to the Honorary Advisory Council of Scientific and Industrial 

 Research, on "The Acoustic Efficiency of Fog-Signalling, Father 

 Point Experiments, 1917." 



The contents may be summarized as follows, the table at the end 

 being compiled from the figures tabulated in the various sections: 



Section I. Introduction. 



Section II. The Robinson Cup Anemometer Compared with Pilot 

 Balloons Under Open Air Conditions. 



A comparison between the wind velocities deter- 

 mined with a Robinson Cup Anemometer at an 

 elevation of 40 ft. and those calculated from observa- 

 tions on a pilot balloon drifting past it, showed a very 

 satisfactory agreement between the two methods of 

 observation, under open air conditions. 



Section III. The Robinson Cup Anemometer Compared with a 

 Simple Pilot Tube Anemometer under Open Air Con- 

 ditions. 



Two simple Pitot Tubes which could be con- 

 structed easily in any laboratory, were tested under 

 open air conditions and found to give very satisfactory 

 results. 



