528 Day and Sosman — Nitrogen Thermometer Scale 



Table III. Gas Thermometer Measurements in Nitrate Bath. 



Date 



Serial 

 No. 



P' 



P t 



eat 



e fixed 



point 



Temp, of 

 fixed 

 point 



1911 





IS Oct. 



2 



20 " 



6 



30 " 



11 



1 Nov. 



14 



18 Oct. 



3 



20 " 



5 



4 Nov. 



16 



17 " 



25 



18 " 



27 



18 " 



28 



10 Nov. 



19 : 



10 " 



20 



10 " 



21 



14 " 



23 



Benzophenone, boiling point. 



1023-36 

 1020-60 

 1053-07 

 1054-84 



1216-27 

 1215-85 

 1256-96 

 1256-54 

 1255-85 

 1254-96 



1024-47 



306-97 



2379.8 



1021-69 



305*37 



2364-7 



1054-18 



304-91 



14944* 



] 055-97 



305-91 



15002* 



Zinc, melting point. 



Antimony, melting point. 



1627 



•10 [ 



1627 



•09 



1626 



•96 



1625 



•08 



2369-2 



305-82 



2369-2 



305-86 



14996 



305-82 



15005 



305-96 



Mean 



305-87 



1218-05 



418-78 



3429*4 



1217-61 



418-53 



3427-1 



1258-76 



419-32 



3432-2 



1258-35 



419-18 



3432-9 



1257-69 



418-80 



3429-0 



1256-80 



418-29 



3423-8 



3433-7 

 3433-7 

 3433-7 

 3433-7 

 3433-7 

 3433-7 



Mean 



419-24 



419-24 



419-48f 



419-27 



419-31 



419-36 



419-28 



1630-58 



629-66 



5525-8 



1630-57 



629-66 



5525*2 



1630-44 



629-58 



5524-2 



1628-59 



628-54 



5515*5 



5527-7 I 629-84 



5527-7 629-90 



5527-7 629-92 



5527-7 629-73 



Mean 629*85 



* Copper- constantan thermoelement. 

 f Wide temperature variation on manometer, 

 from the mean. 



This value is omitted 



6. Interpolation Formula. 



For convenient interpolation with thermoelements in this 

 temperature region, the following equation is accurate within 

 0-3° as far as the melting point of copper, but may not be used 

 beyond that temperature or below the boiling point of ben- 

 zophenone : 



e — _308 + 8'2294£ + -001649 2 2 



In terms of the standard element used in our recent publica- 

 tion upon this subject," this equation gives the following 

 electromotive forces ; 



* Publication Xo. 157, Carnegie Institution of "Washington, pp. 109 et seq. 

 For the measurement and interpolation of temperatures above 1082 , 6 C , the 

 reader is referred to the same pages ; for temperatures below 305 '9° to page 

 536, following (Adams and Johnston). 



