A. L. Day and J. K. Clement — Gas Thermometer. 453 



now, following the usual practice, we take the melting 

 temperatures of zinc, silver and copper and pass a parabola 

 through these, we obtain 



T = 55-51+0-110789E— 1-2197 (10) ~ 6 E 2 (Equation II) 



instead of Equation I. And if, by way of illustration, we 

 recompute all the temperatures of Table III, using this new 

 equation and compare the results with those obtained from 

 Equation I, we have an illustration (Table VI) of the effect of 



Table VI. 



Equation I T=51-72 + 0'll2499 E— T35512 (10)- 6 E 2 

 Equation II T=55'51 +0*110789 E-1'2197 (10)~ 6 E 2 



No. of 



i 



! 



Temperature 



Obs.-Calc. 



I 



Obs-Calc. 



Observation 



Observed 



Calculated 

 I 



Calculated 

 II 



II 



1,2,5,6,13,14 













26, 27,50,51 



418-97° 



419-35° 



418-97° 



-•38° 



o-oo 



46,47 



450-88 



451-16 



450-46 



-•28 



+ 0-42 



71,72 



468-75 



469-13 



468-31 



-•38 



+ 0-44 



30,31 



489-84 



489-80 



488-84 



+ •04 



+ 1-00 



28,29 



519-89 



519-53 



518-42 



+ •36 



+ 1-47 



36,37 



550-73 



550-47 



549-21 



+ •26 



+ 1-52 



58,59 



571-43 



571-08 



569-73 



+ •35 



+ 1-70 



32,33 



587-99 



587-56 



586-15 



+ •43 



+ 1-84 



42,43 



644-31 



643-80 



642-24 



+ •51 



+ 2-07 



54,55 



663-48 



663-16 



661-58 



+ •32 



+ 1-90 



34,35 



688-14 



687-73 



686-11 



+ •41 



+ 2-03 



65, 66 



710-49 



710-45 



708.84 



+ •04 



+ 1-65 



52,53 



751-44 



751-24 



749-70 



+ •15 



+ 1-74 



38,39 



769-18 



769-06 



767*50 



+ •12 



+ 1-68 



60,61, 62 



795-37 



795-35 



793-85 



+ •02 



+ 1-52 



73,74 



839-71 



840*15 



838-80 



— •44 



+ 0-91 



40,41 



867-22 



867'25 



866-04 



— •03 



+ 1-18 



67,68 



889-23 



889-82 



888-72 



-•59 



+ 0-51 



75, 76 



930-66 



931-50 



930-68 



-•84 



-0-02 



44,45,69, 70 



956-68 



957-28 



956-68 



-•60 



o-oo 



56,57 



978-46 



978-78 



978-35 



— •32 



+ 0*11 



19,20 



1012-80 



1012-67 



1012-57 



+ •13 



+ 0-23 



24,25 



1032-73 



1032-25 



1032-37 



+ •48 



+ 0-36 



48,49,63, 64 



1056-87 



1057-04 



1057*45 



-•17 



— 0-58 



17,18,21,22,23 



1078-31 



1077*68 



1078-31° 



+ •63 



o-oo 



Am. Jour. Sci. — Fourth Series, Vol. XXVI, No. 155. — November, 1908. 

 32 



