20 



Starkweather — RegnauWs Calorie and Our 



1 



119-25 



2 



119 60 



3 



122-17 



4 



125-2 



5 



125-5 



6 



127-2 



7 



1290 



8 



1344 



9 



134-2 



10 



135-1 



11 



135-0 



12 



135-2 



13 



1355 



14 



1357 



15 



1364 



16 



137-5 



17 



137-7 



18 



138-6 



19 



1420 



20 



142-2 



21 



142-5 



22 



143-4 



23 



144-3 



24 



1443 



25 



145-3 



26 



145-4 



27 



1456 



28 



1465 



29 



1476 



30 



149-0 



31 



150-2 



32 



153-5 



33 



154-1 



34 



155-1 



35 



155-2 



36 



1552 



37 



155-3 



195° between -f0'2 per cent and — 02 per cent, mostly posi- 

 tive. These sudden changes are rendered much more promi- 

 nent by the following table. In the first column is given the 

 number of the experiment, in the second the temperature, and 

 in the third the fractional deviation of the observed total heat 

 from that calculated by Regnault's formula. 



•0019 

 •0003 

 0024 

 •0018 

 •0016 

 •0011 

 •0007 

 0026 

 •0000 

 •0024 

 •0033 

 •0033 

 •0040 

 •0031 

 •0032 

 •0029 

 •0028 

 0034 

 •0034 

 + 0016 +-0031 +-0044 

 + •0013 +-0028 +-0041 

 + ■0021 +-0036 +-0049 

 + •0013 +-0028 +-0041 

 •0029 

 + •0005 +-002O +-0034 

 + •0005 +0020 +-0034 

 •0018 

 •0050 

 •0059 

 •0040 

 •0058 

 •0037 

 •0040 

 0012 

 •0027 

 •0036 



number 32. Previous to this the deviations have been both 

 positive and negative, mostly negative, and have averaged 

 under 0*2 per cent. Now the deviations are all negative and 

 rarely under 0*4 per cent. But the reason for this is evident 

 from a glance at Regnault's tables. From number 25 to 32 

 the calorimeter temperatures are very nearly constant, averag- 

 ing ll°-5 and 23°*5, or the results are in <? 17 as a unit. Now if, 

 as we have seen to be almost certain, Regnault's thermometric 

 scale is that of the air-thermometer, and if we express every- 

 thing in terms of the specific heat at 15° as a unit, these total 

 heats should be a little large, since the specific heat at 17° is 



0009 



-•0014 



— 



0011 



0018 



— •0018 



— 



0015 



•0025 



-•0028 



— 



0025 



•0013 



— 0003 





0000 



•0018 



-•0008 



— 



0005 



•0008 



+ •0002 



+ 



0005 



•0011 



-•0001 



+ 



0002 



0024 



+ -0C15 



+ 



0018 



•0002 



-•0007 



— 



0004 



•0013 



+ 0004 



+ 



0007 



•0023 



+ •0014 



+ 



0017 



0002 



— •0011 



— 



0007 



0013 



-•0006 



— 



0002 



•0009 



-•0002 



+ 



0002 



•0008 



— •0001 



+ 



0003 



•0016 



— •0009 



— 



0005 



•0020 



— 0013 



— 



0009 



0006 



+ •0001 



+ 



0005 



•0009 



-•0002 



+ 



0002 



•0016 



— •0009 



— 



0005 



•0036 



-•0029 



— 



0025 



•0002 



+ •0009 



+ 



0013 



0018 



— •0025 



— 



0021 



•0013 



— •0006 



— 



0002 



•0003 



-•0004 



+ 



0001 



•0014 



-•0021 



— 



0016 



•0028 



— •0035 



— 



0030 



•0002 



— •0009 



— 



0004 



•0030 



— •0037 



— 



0032 



•0014 



+ •0007 



+ 



0012 



•0005 



-•0002 



+ 



0003 



•0050 



-•0035 



— 



0029 



0050 



-•0035 



— 



0028 



•0060 



-•0025 



— 



0019 



•0060 



— •0045 



— 



0039 



•0028 



-•0013 



— 



0007 



0044 



— •0029 



-0023 



ice evident what a i 



Previous to 



this 



38 



1557 



39 



1565 



40 



157-1 



41 



157-8 



42 



160-3 



43 



1604 



44 



161-8 



45 



1646 



46 



164-9 



47 



171-6 



48 



172-6 



49 



1726 



50 



172-8 



51 



173-1 



52 



173-4 



53 



1739 



54 



174-0 



55 



175-3 



56 



175-5 



57 



179-3 



58 



179-6 



59 



1796 



60 



1800 



61 



183-2 



62 



183 5 



63 



183-7 



64 



183-7 



65 



186-0 



66 



I860 



67 



187-9 



68 



188-2 



69 



188-2 



70 



193-8 



71 



194-2 



72 



194-7 



73 



194-8 



•0040 



-•0025 



_ • 



•0020 



— •0005 



+ • 



■0046 



— •0031 



— • 



•0040 



-•0025 



— • 



•0039 



— •0024 



— • 



■0034 



— •0019 



_ • 



•0030 



— •0015 



— • 



•0050 



— •0035 



— 



•0024 



-•0009 





•0050 



— •0035 



— • 



•0059 



- 0044 



— • 



0059 



-•0044 



— • 



•0066 



— •0051 



— • 



•0058 



-•0043 



— • 



•0059 



-•0044 



_• 



0056 



— •0041 



— • 



0055 



-•0040 



_ • 



0060 



-•0045 



— 



•0060 



— •0045 



— • 



0016 



+ •0031 



+ 



•0013 



+ •0028 



+ 



•0021 



+ •0036 



+ 



•0013 



+ •0028 



+ ' 



•oooo 



+ •0015 



+ • 



•0005 



+ -0020 



+ • 



•0005 



+ 0020 



+ ' 



•0011 



+ •0004 



+ • 



•0020 



+ •0035 



+ • 



•0026 



+ •0041 



+ • 



•0009 



+ •0024 



+ 



0026 



+ •0041 



+ • 



•0005 



+ •0020 



+ 



0006 



+ •0021 



+ 



•0022 



— •0007 



+ 



•0008 



+ -0007 



+ • 



•0001 



+ •0016 



+ ' 



