190 



ROYAL SOCIETY OF CANADA 



with when trying to use a wet and dry bulb instrument for outdoor 

 work, when the temperature is near or below freezing point. 



The following table (No. 2) tends to prove that the wet and dry 

 bulb instrument can be made to give satisfactory indications. 





_ o .s 



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 CO "* ï— * CO " 



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