Tables 480 and 481 



TABLE 480. — Thermoelectric Power; Pressure Effects 



407 



The following values of the thermoelectric powers under various pressures are taken from Bridgman, Pr. Am. Acad. 

 Arts and Sc. 53, p. 269, 1918. A positive emf means that the current at the hot junction flows from the uncompressed 

 to the compressed metal. The cold junction is always at 0° C. The last two columns give the constants in the 

 equation E = thermoelectric force against lead (0° to ioo° C) = (Al + BP) X io* 6 volts, at atmospheric pressure, a 

 positive emf meaning that the current flows from lead to the metal under consideration at the hot junction. 



Metal. 



Bit 



Zn f 



Tl t 



Cd t 



Constantant 



Pd* 



Pt* 



W t 



Ni * 



Ag * 



§Fet 



Pb t 



Au * 



Cu t 



§ Al f 



§ Mo t 



§Snt 



Manganin f. 



Mgf 



Cof 



Thermo-electric force, volts X io 9 



Pressure, kg/cm 2 



8000 



Temperature, ° C 



S3. 000 



6,200 



4.930 



2,040 



2,850 



2,190 



1,810 



1,190 



700 



840 



39o 



460 



456 



+292 



-70 



+93 



+38 



— 123 



-84 



-156 



710,000 

 87,400 

 52,460 

 45,560 

 35,470 



26,520 

 21,570 

 15,140 



1 1 ,440 

 10,560 



7,680 

 6,330 

 5,760 

 3,546 



1,962 



833 



+390 

 —1,314 



— 1,296 



— 2,061 



Formula 

 coefficients. 



0160 

 00495 

 00134 ' 

 1619 

 0397 



01760 



01334 

 01705 

 0178 



00432 

 0089 2 



00467 3 

 00483 



00008 * 

 02167 5 

 00067 

 000414 ' 

 00004 



0390 



* Identical wire of Table 485. t Another wire of same sample, X Different sample. 

 § Results too irregular for interpolation for values at other temperature and pressures; see original article. 

 (1) — .OoS6t 3 ; (2) — .0486/ 3 , annealed ingot iron; (3) — .05166/ 3 ; (4) — .041/ 3 ; (5) — .0425/ 3 ; (6) — .04112^. 



TABLE 481. — Peltier and Thomson Heats; Pressure Effects 



The following data indicate the magnitude of the effect of pressure on the Peltier and Thomson heats. They refer 

 to the same samples as for the last table. The Peltier heat is considered positive if heat is absorbed by the positive 

 current from the surroundings on flowing from uncompressed to compressed metal. A positive d 2 E/dP means a larger 

 Thomson heat in the compressed metal, and the Thomson heat is itself considered positive if heat is absorbed by the 

 positive current in flowing from cold to hot metal. Same reference and notes as for preceding table. 



Metal. 



§Bit 



§Znt 



§ Tl J 



§Cdt 



Constantan X 



§ Pd * 



§Pt* 



§ W } 



§ Ni * 



Ag* 



IFet 



Pb X 



Au * 



Cut 



§ Al t 



§ Mo X 



§ Sn t 



§ Manganin t 



Mgf.. 



§ Co t 



Peltier heat, 

 io 6 X Joules/coulomb. 



Pressure kg/cm 2 



6000 



Temperature ° C 



+1070 



+98 



+66 



+ 19 



+46 



+35 



+23 



+ 17 



+ 11 



+ 13 



— 11 



+ 7 



+6 



+4 



+ 1 



-16 



-23 



+ 1210 



+140 



+95 



+ 71 



+57 



+43 



+37 



+ 25 



+ 17 



+ 17 



+ 18 



+ 10 



+ 10 



+6 



+ 2 



+ 2 



+ 1 



— 2 



-18 



-33 



+ 190 



+ 124 



+« 



+ 70 



+52 



+35 



+32 



+23 



+ 23 



+15 



+ 16 



+ 14 



+8 



+8 



+0 



+1 



— 2 



— 21 



-44 



+ 2580 



+ 190 



+ 112 



+81 



+90 



+68 



+45 



+36 



+ 24 



+ 25 



-3S 



+ 14 



+ 13 



+8 



-3 



+2 



-5 



-4 



-35 



-46 



+ 2S10 



+278 



+171 



+148 



+ 114 



+86 



+ 76 



+49 



+37 



+34 



+38 



+ 20 



+ 18 



+ 11 



+ 7 



+4 



+ 2 



-4 



—42 



-67 



+412 



+ 229 



+ 221 



+ 140 



+ 103 



+65 



+65 



+50 



+44 



+36 



+30 



+ 25 



+ 16 



+ 17 



+ 1 



+ 2 



— 4 



-48 



-90 



Thomson heat, 

 io 8 X Joules/coulomb/ C 



Pressure kg/cm 2 



Temperature ° C 



+ 1150 



+41 



+38 



+109 



+5 



+3 



+49 



+8 



+9 



+4 



+79 



+ 2 



+4 



+4 



+6 



+ 1 



+6 



+ 1 



o 



— 14 



+650 



+48 



+ 28 



+ 74 



+6 



+4 



-6 



+7 



+7 



+5 



+58 



+6 



+4 



+1 



+9 



-5 



+0 



+ 1 



+56 



+ 26 



+63 



+6 



+4 



-18 



+6 



+8 



+6 



— 121 



+ 10 



+5 



+4 



+11 



— 1 



— 1 

 +0 



-520 

 +63 

 + 79 

 + 105 

 + 13 



+9 

 +96 



+9 

 + 16 



+ 7 

 -347 



+6 



+6 



+6 

 + 21 



+ 2 

 + 29 



+ 2 



-405 



+ 133 



+63 



+92 



+ 14 



+9 



+ 17 



+ 14 



+ 15 



+8 



+120 



+8 



+6 



+3 



+ 16 



— 11 



+ 2 



+ 1 



+ 220 



+50 



+93 



+ 17 



+8 



+59 



+20 



+ 10 



+ 10 



-194 



+ 20 



+ 7 



+8 



+20 



— 2 



-5 



+ 1 



o 



-28 



Smithsonian Tables. 



* t X I Same significance as in preceding table. 



