116 Messrs. Nichols and Wheeler on the Coefficient 









Table II. (continued). 





Percentage of NH 3 in solu- 



Percentage of NH 3 in solu- 



tion = 7-96 per cent. 



tion = 5*61 per cent. 



Temperatures. 



Observed volumes 



Temperatures. 



Observed volumes 











Golaz 



Ail- 



compared with 



Mercury- 



Air- 



compared with 



thermo- 



thermo- 



volume at 4° as 



thermo- 



thermo- 



volume at 4° as 



meter. 



meter. 



unity. 



meter. 



meter. 



unity. 



15-20 



15-00 



1-002662 



20-00 



1980 



1-003180 



1000 



9-80 



1-001191 



15-00 



1480 



1-001953 



5-00 



4-80 



1-000141 



900 



8-80 



1000726 



o-oo 



- 0-20 



0-999417 



5-00 



4-80 



1-000106 



- 5-00 



- 5-20 



0-998932 



1-00 



116 



0-999594 



-1000 



-10-20 



0-998740 



- 1-00 



- 120 



0-999398 



-11-00 



-11-20 



0-998733 



- 4-00 



- 4-20 



0-999298 



-1200 



-12-20 



0-998760 



- 5-00 



- 5-20 



0-999272 



-13-00 



-13-20 



0-998794 



-1000 



-10-20 



0-999289 



Percentage NH 3 in solution =2*12 per cent. 



Temperatures. 



Observed volumes 





compared with 

 volume at 4° as 







Mercury -thermometer. 



Air -thermometer. 



unity. 







15 



14-75 



1-001114 



10 



9-72 



1-000413 



5 



4-76 



1-000033 



3 



2-80 



0-999958. 1 



2 



1-80 



0-999941 







-0-20 



0-999941 



-5 



-5-20 



1-000296 



From Table II. curves were plotted, with temperatures as 

 abscissaa and volumes as ordinates (see fig. 2); and from these 

 curves a table was compiled; giving volumes and coefficients 

 of expansion for temperatures between +20° and —20° (see 

 Table III.). 



