358 Dr. C. Bnrus on the Relation between the Thermoelectric 



Table VII. 



No. 



T. E. H. 



Resist- 

 ance. 



S. 



AS . 



AS 



Remarks, 



T. E. H. 



* 1. 



0-000010 



00540 



0-157 



0-021 



2100 ^ 





# 2. 



13 



0616 



158 



022 



1700 





» 3. 



11 



0537 



159 



023 



2100 y 



Annealed at 300° t. 



# 4. 



14 



0691 



163 



027 



1900 





* 5. 



12 



0592 



166 



030 



2500 ; 





* 6. 



* 7. 



18 

 24 



0763 

 0659 



177 

 185 



041 



049 



23001 

 2000/ 



Annealed at 280°. 



# 8. 



* 9. 



33 

 31 



0746 



0807 



205 

 206 



069 

 070 



2100 1 



2200/ 



Annealed at 240°. 



#10. 



36 



0731 



209 



073 



2000 



Annealed at 200°. 



#11. 



#12. 



57 

 58 



0-1088 

 0-1155 



250 

 261 



114 

 125 



20001 

 2200] 



Annealed at 150°. 



Soft 1 

 iron, j 











r 



Heated in flame of a Bun- 



-0-000004 



0-0420 



0-133 



-0-003 



- 



sen burner to redness and 











[ allowed to cool in air. 



E. The resistances thus far determined being so very small, 

 it was to be feared that, in spite of the continuity apparent in 

 their variation, errors from insufficient contact might have 

 conspired in producing illusory results. For these reasons 

 check-experiments with longer wires were made, the resistance 

 of some of which (I. to Y.) is sufficiently great to admit of 

 direct comparison with the Siemens unit (etalon). To ensure 

 a more homogeneous hardening, these wires were spirally 

 wrapt around a round stick of wood, and the length and dia- 

 meter of the coils resulting so determined that the whole 

 during the process of heating could be brought within the 

 mantle of the blast-flame. In other respects the method given 

 under C was pursued. 



Table VIII. 



No. 



Resist- 

 ance. 



Length. 



Dia- 

 meter. 



S. 



AS . 



Remarks. 



I. 



0-643 



m 



0-880 



0-67 



0-260 



0-124 



Heated yellow and immersed. 



II. 



379 



917 



96 



296 



160 





III. 



245 



928 



1-19 



293 



157 





IV. 



121 



932 



1-83 



342 



206 



„ br. red „ „ 



V. 



105 



556 



1-62 



391 



255 



„ br. yellow,, „ 



#VI. 



0-0169 



0-1733 



215 



354 



218 



,, br. red „ „ [darker. 



*VII. 



00155 



0-1732 



2-15 



325 



189 



Heated br. red and immersed ; ends 



*VIII. 



0-0169 



0-1740 



2-15 



352 



216 



>> )> )> >> 



t Rods 1 to 5 remained in the bath during the whole process; the 



