J hernial RaJiatU 



Absolute Measu 



re. 



551 



Table II.— June 17, 1897. Two Platinum Wires, Pt 3 and 

 Pt 4 , length 39*2 cm., diameter O025 cm., from the same 



1 



lank of wire 



Pt 3 bright, 



Pt 4 sooted. 







Current i 





Pt 3 . 



Pt 4 . 



Pressure 













i m 



Resist- 





Thermal Energy 



Resist- 





Thermal Energy 



in 



amperes. 



ance 





lost per square 



ance 





lost per square 



millimetres. 





in 



Temp. 



centimetre per 



m 



Temp. 



centimetre per 







ohms. 





second. 



ohms. 





second. 





0*0245 



1-94 



o 



15 



9001x10-4 



1-94 



o 

 15 



0-9004x10-4 



000040 



: 0819 



203 



41 



10 53 



1-984 



26 



1029 



o-oooio 



0-1638 



2-27 



120 



48-09 



2050 



47 



4252 



0-00025 



0-2348 



2-466 



190 



105-1 



2 134 



74 



8900 



000033 



0-3003 



2 602 



243 



181-4 



2-224 



109 



155-1 



0-00025 



■ 0-3822 



2 781 



318 



314-2 



2314 



135 



26 1-5 



000025 



' 0-4586 



2900 



377 



473 1 



2-399 



166 



390-2 



000025 



. 0-5405 



3-039 



445 



686-7 



2-492 



200 



5630 



00025 



0-6470 



3196 



538 



1034-0 



2-610 



245 



844-7 



0-00016 



8479 



3-418 



719 



1902-0 



2-788 



321 



1552-0 



0-00025 



1-0230 

 I 1696 









2-919 

 3033 



383 

 442 



2362-0 

 32090 



0-00050 

 0-00130 



:::::::::::::::::: 



; 1-462 

 1608 

 1-754 









3-228 

 3-331 

 3-424 



560 

 637 

 726 



5338-0 

 6658-0 

 8149-0 



0-0019 

 00025 

 00023 



::::::...::::::::: 







Tables III., IV., V., comparing the Amount of Thermal 

 Energy lost per sq. centim. per second by each of two 

 precisely similar Platinum Wires at the same temperature, 

 one of the wires having a Bright Metallic Surface and the 

 other being Lightly Sooted. 



Table III. 



Pti and Pt 2 . Diameter of Wire, 0-0542 cm. 



Temperature. 



Energy lost by 



Energy lest by 



Ratio 



bright wire. 



sooted wire. 



sooted/ bright. 



200 



11 



5-3 



4-8 



250 



18 



89 



4-9 



300 



2-7 



12-8 



4-7 



350 



3-8 



19-8 



5-2 



400 



4-9 



261 



5-3 



450 



6-2 



33-3 



5-4 



500 



79 



420 



5-3 



550 



100 



500 



50 



600 



11-9 



58-5 



4-9 



650 



13-8 



68-7 



50 



