454 

 455 

 456 

 457 

 458 



459 

 460 

 461 

 462 



483 

 484 

 485 

 486 



487 

 488 



489 



CONTENTS XIX 



Infra-red reflection, solids, 22.9 and 32.8/x. 393 



" transmission, various substances, 20 to 130/1. 393 



Far infra-red, 20 to 150/^: Restrahlung bands* 394 



" " " " " Reflecting power 394 



" " " " " Transmission 394 



Long-wave radiations : Long-wave absorption by gases 395 



Properties with wave lengths io8±^ . . . 395 



Rotation of plane of polarized light : Solutions 396 



" Sodium chlorate, quartz . . 396 



463. Electric equivalents 397 



Electromotive Forces 



464. Composition and electromotive force of voltaic cells: 398 



(a) Double fluid cells 398 



(b) Single " " 398 



(c) Secondary cells 398 



465. Contact difference of potentials in volts: Solids and liquids .... 399 



466. Difference of potential between metals in solutions of salts .... 400 



467. Thermoelectric power 401 



468. " " of alloys 402 



469. Thermal e.m.f. of metals and alloys versus platinum (millivolts) . . 403 



470. " platinum-rhodium alloys versus platinum . . . 403 



471. " aluminum versus platinum 404 



472. " zinc versus platinum 404 



473. " cadmium versus platinum 404 



474. " nickel versus platinum 404 



475. Thermoelectric properties at low temperatures 405 



476. Thomson effect in microvolts per degree 405 



477. Peltier effect 406 



478. " " , Fe-Constantan, Ni-Cu, o° to 560 C 406 



479. " e.m.f. in millivolts 406 



480. Thermoelectric power ; pressure effects 407 



481. Peltier and Thomson heats ; pressure effects 407 



482. The tribo-electric series 4°8 



Electrical Resistance 



Auxiliary table for computing wire resistances 408 



Resistivity of metals and some alloys 409 



Resistance " " under pressure (Bridgman) 412 



" mercury and manganin under pressure 412 



" metals, effect of tension on 4 J 3 



Conductivity and resistivity of miscellaneous alloys ; temp. coef. . . 414 



Conducting power of alloys 4 X 5 



