50 



MR J. Y. BUCHANAN ON THE 









(c) Time: 3.02 p.m. 







w. 



t. 



dw,. 



W. 



R. 



W„,o. 



S. 



0^91 



roi 



Ml 

 121 

 1-31 



r4i 



1^61 

 1-71 



19-5000 



0000000 



181-821300 

 •921300 



182-021300 

 -121300 

 -221300 

 -321300 

 -421300 

 •521300 

 •621300 



6-2 

 17-5 

 29^0 

 400 

 510 

 62^0 

 73^0 

 84^0 

 95^2 



18r317012 

 •418105 

 •522019 

 •619795 

 •720107 

 •819382 

 •917984 



182^015092 

 •114828 

 Mean 



1-002782 

 73 

 50 

 61 

 57 

 59 

 66 

 81 

 81 



1-002768 









{d) Time : 3.30 p.m. 







w. 



t. 



diOi. 



W. 



R. 



Wh,o. 



S. 



0-91 



19-5200 



-000520 



181-821820 



6^5 



181-319701 



r002769 



101 







-921820 



17^8 



-420794 



61 



111 







182-021820 



29^0 



-522019 



53 



121 







-121820 



40^0 



-619795 



64 



1-31 







•221820 



bl-0 



-720107 



59 



1-41 







•321820 



62^0 



•819382 



63 



1-51 







•421820 



73^0 



•917984 



66 



1-61 







•521820 



84^2 



182^016885 



74 



1-71 







•621820 



95^3 



•115724 

 Mean 



99 

 1^002765 



Dealing first with sub-table (a), we see that the temperature at the commencement 

 was 19'5° C, and at the end of the series of observations 19"48°, giving a difference of 

 0"02° fall during the time that the observations were being made. As nine separate 

 observations were made, we can assume that the temperature fell by equal amounts 

 between each two observations, so that if we take as the first temperature 19*5°, and 

 then successively subtract 0'00"25° for each reading, the last will be taken at 19*48° C. 

 As the temperature falls, the density of the solution rises, so that in order to com- 

 pensate for the fall of temperature, the weight, diVi, corresponding to this departure of 

 temperature from the standard must be subtracted from the total observed weight of 

 the hydrometer. The values of dwi are placed in the column headed diVt. Under iv 

 are given the small weights which were placed on the stem of the hydrometer in order 

 to immerse the instrument. Under W is given the total weight of the hydrometer, 

 corrected for temperature, that causes it to float at the scale reading, R, at 19'5'' C. 

 In column Wh^o is given the corresponding total weight when the hydrometer is 

 immersed in distilled water of 19"5°C. The value found for the specific gravity for 

 each added weight is given under S. 



'J'he values found for the specific gravity in this series are greater than those found 



