Joule's Law. 



937 



62 123. 1 : 10. 



62124. 



62 121. 1 : 5. 



62 122. 1 : 6. 



62 125. 1 : 0. 



H2.121. Current Calorimeter after Pfaundler, Figure (Fr. phys. Techn. II, 1, Fig. 459; <! 

 M. P., 9 th Edn., Ill, p. 511) ', 10. 0. 



12.122. Apparatus for deriving Joule's Law, after Grimschl, Figure (Ztschr. f. d. phys. 



11. chein. U. 15, 1902, p. 347; Grimsehl, p. 777) 0.12.0 



1:2. 123. Glow Lamp for the numerical determination of the Electric Equivalent of Heat, after 

 Grimsehl, F i g u r e, arranged to burn under water (Ztschr. f. d. phys. u. chem. U. 

 16, 1903, p. 211, Fig. 1; Grimsehl, Fig. 821). The lamp can be supplied for pressures 

 of 65 220 volts. The voltage desired should be quoted when ordering, otherwise 110 volt 

 lamps are supplied. Price without stand, beaker, stirrer or thermometer 0. 10. 



12.124. Glow Lamp for demonstrating the difference between Thermal Energy and Total 



Energy, after Grimsehl, Figu re (Ztschr. f. d. phys. u. chem. U. 16, 1903, p. 213, 

 Fig. 2). The lamp is generally supplied for 15 volts, but it can be supplied for any oilier 

 voltage up to 3( . . ().<.( 



(2.125. U-shaped Tube for Demonstrating the Heating of Mercury by the Electric Current 



after Friedr. ('. ('.. .Miillei. Figure (M. T. Fig. 209) 



62.126. Mercury Resistance Thermometer after Friedr. ('. G. Miillcr, for demonstrating Joule's 

 Law quantitatively (M. T. Fig. 210) . . . 



2.127. Apparatus for Proving Joule's Law by the elongation of a wire, after Friedr. (\ G. 

 Miillei' (.M. T. Fig. 212) '..... 



62.12*. Apparatus for the same purpose, after Kann; can also be used as a demonstration 

 hot-wire ammeter (Zlschr. f. d. phys. u. chem. U. 15, 1902, p. 286) 



For further Demonstration Hot-Wire Ammeters see p. 904. 



C'l. SOlil, .,!!(>:{. 

 509-1, 5!)81. 



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0. u;. (i 



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5090, 



