140 



BENJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



TABLE OF QUANTITY, 



Showing the Weight, in Grains, of a Cubic Foot of Vapor, at different Tempera- 

 ture#, from to 95 Fahrenheit. 



TABLE OF CORRECTIONS, 



To be used when the Term of Deposition, or Dew Point, differs fr< m the Tempe 

 rature of the Air in the Shade. 



RULE. To find the weight of moisture in a cubic foot of air at any time Divide 

 the weight in Grains, found opposite the Temperature, corresponding to the Dew 

 Point at (he time, in the Table of Quantity, by the Correction found opposite to 

 Difference of Temperature in Tab e of Corrections, corresponding to the absolute 

 dryuess existing at the time. 



