of Water at High Temperatures, 



127 



from the parabola to the theoretical. Judging from the curve of 

 differences, the deflection from theory commences about 210°; 

 and taking 1*18 as the volume at this temperature, and draw- 

 ing the curve (by computation) through this and the preceding 

 observation at 325*2, we find y= 411-6, # = 342*8, and 



342*8 

 411-6 -i 



(Q) 



is the equation for the volume of water in terms of its tempera- 

 ture from 210° upwards. 



This cuts the lower parabola at about 185°. The intersection 

 is shown upon a large scale in fig. 11. Also the line of observa- 

 tions, which coincides with the parabola at about 175° and with 

 the normal theoretical at about 190°. 



§ 22. The annexed Table contains the general results of the 

 inquiry. 



Column 1 is the C.A. temperatures. 



„ 2 is the volumes computed from (Q). 



„ 3 is the observed volumes. Above 210° the mean of 



the oil and acid thermometers is taken. 

 „ 4 is the observed minus the computed volumes. 



1. 



2. 



3. 



4. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



411-6 









2001-1622 



11612 



-•0010 



0009 

 •0012 

 0012 

 0013 





-•0060 



400 



2-8715 







1901*1456 



11455 



-•0001 





-•0049 



390 



23660 







18011299 



11309 



+•0010 





-•0036 



380 



21014 







1701 1151 



11173 



+ •0022 







-•0020 



370 



1-9286 







16011011 



1-1046 



+ •0035 





-•0002 



360 



1-8038 







150 10878 



1 0926 



+ 0048 ^13 

 + 0061 1$ J 



+ 0075 2 * 



+-0<>92 Z\l 





+ •0017 



350 



1-7069 







14010752 



10813 





•0037 



340 



1-6287 







130 1-0632 



10707 





•0058 



330 



1-5637 







12010517 



1-0609 





•0079 



320 



1-5084 



1-5098 



+•0014 



1101 04 07 



10517 



+ 0110 



•0021 

 •0024 

 •0027 

 •0030 

 •0031 

 •0036 



0042 

 •0047 



0052 

 •0060 

 •0072 

 •0087 





•0103 



310 



1-4606 



1-4584 



-•0022 



100 1-0302 



1-0133 



+ 0131 





•0128 



300 



14185 



1-4181 



-•0004 



90 10201 



10356 



+ 0155 





•0154 



290 



1-3810 



1-3804 



-•OoOfi 



80 1 0104 



1-0286 



+•0182 



3333 

 2941 

 2778 

 2381 

 2128 

 1923 

 1667 

 1389 

 1149 



•0183 



280 



1-3475 



1*3479 



+ •0004 



7010011 



10223 



+ •0212 



•0213 



270 



13171 



1-3182 4-001 1 



60 9921 



10167 



+ •0246 



•0247 



260 



1-2893 



l-289rt+-00U3 



50 



•9835 



1-0117 



+•0282 



•0283 



250 



1-2640 



1-2645 +-0005 



40 



•9752 



10076 



+•0324 



•0325 



2^0 



1-2405 



1-2397- -0008 



30 



•9671 



1-0042 



+ •0371 



•0371 



230 



1-2190 



1-2186-0004 



20 



•9594 



10017 



+ 0423 



•0423 



220 



11986 



1-1986 







10 



•9519 



1 0002 



+ •0483 



•0483 



210 



1-1799 



1-1800 



+•0001 







•9446 



10001 



+•0555 



•0555 



200 



11622 



11612 



-•0010 



-10 



•9376 



1-0018 



+•0642 



•0644 



These differences, it will be observed, increase regularly from 

 190° downwards. We have here presented to us the effect of the 

 abnormal cause which constrains the molecules of water and 

 raises them to a greater volume than they would assume at the 



