936 



Voltaic Electricity. Section 4: Ohm's, Kirchhoff's and Joule's Laws. 



No. 



62116. 1:8. 



62 117. 1 : 5 



62 115. 1 : 5. 



62120. 1:7. 



Heating Effects of the Electric Current, Joule's Law. 



ti-.lll. Apparatus for showing the Generation of Heat by the Electric Current, F i u re 

 (M. P., 10 th Edn., IV, 1, Fig. 454; 9"' Kdn., Ill, Fig. -430), with thermometer . . . 



0. Hi. 



(LMI5. -- idem, for demonstrating objectively. Figure 0. Id. (> 



lii'.llt;. Caloriscope after Lermantoff, Figure, for the same purpose !.<;.<) 



The, apparatus can also be used ;i^ ;i simple thermoecope. 



C'-M17. Apparatus after Foster, Figure (\V. I). Fig. 531 [504 1), tor showing that the 

 liealiug effect on a conducting wire is proportional to (lie resistance and as the stpiare 

 of the current . 



1. Iti. o 



lii'.li*. Current Conductor of Silver and Platinum Wires soldered together (M. 1'.. K)" 1 Kdu.. 

 IV, I. Fig. 455; !)'" Kdn.. Ill, Fig. I:!'-': \V. D. p. S15 [754 |). for explaining the diffe- 

 rence in specific resistance of two metals 0. 10. # 



It is also possible to show the heating effect of the electric current and the comparison of re- 

 sistances heated by the current, by the aid of Kolbe's and Looser 's Thermoscopes ("Heat" 

 Section'. 



<;LM lit. Calorimeter for demonstrating Joule's Law, after Friedr. C. d. .M filler (M. T. Fig. iM3) o. s. n 



(Ji'.iiiu. Calorimeter for demonstrating Joule's Law, for students exercises, after Halm, 



Figure (Halm. Schiilcriibungen. Fig. L'SJ), with thermometer 0.1-'. (I 



ci. J.vjc.. : 

 396, 



