A. L. Day and J. K. Clement — Gas Thermometer. -M9 



of the second degree, between 400° to 1100°, with an accuracy 

 of ±0*5°. The differences between our observed temperatures 

 and the temperatures calculated from formula I, however, 

 cannot be attributed wholly to observational error on account 

 of their systematic variation. For greater accuracy than 0*5° 

 it will therefore be necessary to use a different equation — 

 perhaps an equation of four parameters. 



Table III. 



(I) T = 51-72 + 0-112499E - 1-35512 x 10~ 6 E 2 



No. of 

 Observation 



Thermo-couple 



Temperature 







M. V. 



Observed 



Calculated 



T(obs.)- 



-T (cal.) 



1, 2, 5. 6, 13, 14. 













26, 27, 50, 51 



3407-7 



418-97 



419-35 



_ 



•38° 



46, 47 



3717- 



450-88 



451-16 



— 



•28 



71, 72 



3892-8 



468-75 



469-13 



— 



•38 



30, 31 



4096- 



489-84 



489-80 



+ 



•04 



28^ 29 



4390-5 



519-89 



519-53 



+ 



■36 



36, 37 . 



4699-3 



550'73 



550-47 



+ 



•26 



58, 59 



4906-5 



571-43 



571-08 



+ 



•35 



32, 33 



5073- 



587-99 



587-56 



+ 



•43 



42, 43 



5647- 



644-31 



643-80 



+ 



•51 



54, 55 



5846-8 



663-48 



663-16 



+ 



•32 



34, 35 



6101-8 



688-14 



687-73 



+ 



•41 



65, 66 



6339-5 



710-49 



710-45 



+ 



•04 



52, 53 



6770-5 



751-44 



751-24 



4- 



•15 



38, 39 



6959-8 



769-18 



769-06 



+ 



•12 



60, 61, 62 



7241-7 



795-37 



795-35 



+ 



•02 



73, 74 



7727-5 



839-71 



840-15 







•44 



40, 41 



8024-8 



867-22 



867-25 



— 



•03 



67, 68 



8274-5 



889-23 



889-82 



— 



•59 



75. 76 



8740-5 



930-66 



931-50 



— 



•84 



44, 45, 69, 70 



9032-2 



956-68 



957-28 



- 



•60 



56, 57 



9277-5 



978-48 



978-78 







•32 



19, 20 



9667-5 



1012-80 



1012-67 



+ 



•13 



24, 25 



9895-3 



1032-73 



1032-25 



+ 



•48 



48, 49, 63, 64 



10185-9 



1056-87 



1057-04 



— 



•17 



17, 18, 21, 22, 23 



10430-0 



1078-31 



1077-68 



+ 



•63 



The numbers in column 1, Table III, correspond to those in column 1, 

 Table II. The figures in columns 2 and 3 represent the means of the corre- 

 sponding figures of Table II indicated by the numbers. 



After the series of observations represented by Tables II 

 and III, the bulb was evacuated and refilled with nitrogen 

 under a somewhat higher initial pressure, p = 325 mm . With 

 this filling, the results contained in Table IV* were obtained. 



