Manchester Memoirs, Vol. xlviii. (1903), No. 3. 



the particular specimen. My practice was to remove the 

 cover B, insert the specimen as quickly as possible after 

 shaking off the bulk of the adhering water, adjust the filter- 

 paper over the top of the specimen (using for this purpose 

 cooled crucible tongs), and finally to replace and press 

 down the cover B. 



In most experiments I allowed the object to remain in 

 the dryer for half a minute. In two control experiments 

 the object was allowed to remain in the dryer for ten 



/cs 



Cav/tt 



LlNLD irJiTH 

 flLT£R PA/>C/f 



WATCf) ANO ICl 



Fig. 2. 



minutes ; contrary to expectation, the results in both cases 

 gave a slight excess (| per cent.) for the weight of ice (or 

 ice and water) ; this may have been due to the use of 

 damp filter-paper.* 



The Weighing. 

 After removing the ice-coated object from the drying 

 apparatus, I placed it in a metal vessel and weighed it as 

 quickly as possible. The deposition of dew on the metal 



* The actual numbers, representing the apparent specific heat of copper, 

 were in these two experiments 0*0797 and o'0796. Two similar experiments 

 in which the same piece of copper (a cylinder weighing 161^ grammes) 

 remained in the dryer for half a minute gave 0"0794S and 0*0792. 



