916 



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



N... r.l 883 



61 888. 1 : 5. 



61 892. 1 : 10. 



61893. 1:13. 



61.882. Switch Contact Rheostat, Figure, in wood case with ebonite top, with 22 stages, 

 0, 1, 2, 4, 6, 8, 10, 15, 20, 30, 40, 50, 60, 75, 100, 150, 200, 300, 400, 500, 750, 

 and 1000 ohms (total resistance) ....................... 



61.883. --idem, in 22 stages, total 2000 ohms .................. 



61.884. - - idem, in 22 stages, total 3000 ohms .................. 



61.885. -- idem, in 22 stages, total 4000 ohms .................. 5. 



61.886. idem, in 27 stages, 0, 1, 2, 4, 6, 8, 10, 15, 20, 30, 40, 50, 60, 75, 100. 150. 

 L'OO, 300, 400, 500, 750, 1000, 1500, 2000, 3000, 4000, 5(100 ohms (total resistance) 



The maximum load for Rheostats Nos. 61,882 61,886 is, for the units. o,:t ampere: for the tens. 

 o. I ampere: for the hundreds, 0.05 ampere; and for the thousands. n.O-J ampere. The resistances are only 

 approximately correct . 



<il,X,SX. Drum Rheostat after Friedr. ('. (',. Miiller, F i j; 11 re (/tschr. f. d. pliys. 11. ehein. 

 U. 10, p. 12; M. T. p. 275) ......... ................ 



On a wood drum are stretched vertically 100 man<::inin wires of which 10 <>.."> ohm. The drum is 

 rotary and thus more or less resistance can lie put in. <>M a hoard are titled four coils with ."). lo. l.~> and '2<> 

 ohm and a rheochord with 0.1 ohm resistance. Total resistance. .~>o ohms. The apparatus is vry compact, 

 and the scale visihle at a distance. 



61,115. Forceps for Shunting, for above, Figure on p. *<!<; (M. T. Fig. L'OO) .... 



C|. 217:!. -J471. . 

 4118, ll'.'T. 



3. o. o 

 3.10.0 



4. o. o 

 0.0 



(i. 0.0 



7. 0. 



o. 1. o 



