AND LIQUIDS AND THEIR VARIATION WITH TEMPERATURE. 



0028 

 ' 26 



417 



oozo 



16 



k- 



16 

 14 

 12 



0010 

 S 

 6 

 4 

 2. 



^Sajphitr&fretich 



50 

 Temp. 



fbre 



70 



f ,ha)ine 



so" 



Remarks on preceding Tables. 



In the first table the whole of the observations and redactions are shown, but in 

 the second the observations and only the important steps in the reduction. 



The thickness given in the tables is that of the material under test plus the two 

 layers of glycerine. The correction for the glycerine is too small to be taken into 

 account, except in the case of glass and of the mixture of sulphur and French chalk. 

 The corrected values for glass are : at 35, '00248, '00243, '00244 ; at 55. '00258 ; at 

 68, '00261, '00263 ; at 79, '00272, and for the cement at 32, '00182 ; at 61, '00155- 



The glass was ordinary window glass, known as 22 oz. In the second series of 

 experiments with it, the glycerine contact layers had been replaced by shellac (see 

 p. 420). 



The naphthaline disc was cast between glass plates and ground down to the required 

 thickness. 



The two naphthol discs were obtained by sawing slices from two large blocks of the 

 material and grinding the surfaces. 



The sulphur disc was made by pouring melted sulphur on to a glass plate and 

 grinding the upper surface down till it was parallel to the lower, and the disc of the 



VOL. cxcr. A. 3 H 



