MR. W. N. SHAW ON HYGROMETRIC METHODS. 



Two determinations of the capacity of the new aspirator were made on the same 

 plan as for the old ones (see p. 80), with the following results : 



1st observation, 35987'44 grammes of water at 127 C. 

 2nd 35989-28 12 0> 2 , 



Fig. 6. 



TO ASPIRATING 



'-=^ 



One-tenth natural size. 



These, corrected for temperature expansion of water and copper, give volumes : 



(1.) 36049-33 c.c. at 15 C. 

 (2.) 3604973 



Mean . . 36049 '53 c.c. at 15 C. 

 The volume of the aspirator is therefore at t 



= 36049-5 { 1 + -0000525 (t 15)}. 

 MDCCCLXXXVIII. A. N 



