920 



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



.i. IH914 



61 914 61 917. 1 : 4. 





81918 61921. 1:4. 



61 924 61 926. 1 : 3. 



61 927. 1 : 6. 



61 928. 1 : 10. 



Standard Resistances with separate Shunt Terminals for current measurements, of manganin 

 wire, Figure 



List No. 61,914 61,915 61,916 61,917 



Eesistance 0.001 0.01 0.1 1 ohm 



3.0.0 3.0.0 3.0.0 2.14.0 



Standard Resistances of small values, for current measurements, of manganin sheet. F i g u r e. 



List Xo. 61,918 61,919 61,920 61,921 



Eesistance 0.00001 0.0001 0.001 0.01 ohm 



12. 0. 6. 0. 4. 0. 4. 0. 



The sheet resistances can be loaded up to 100 watts for technical current measurement's in petroleum 

 bath No. 61,927 if well cooled. 



- idem, for heavy Currents, with case formed to suit petroleum hath and with turbine. 



For currents to 2000 800 amps. 



List No. 61,922 61,923 

 Eesistance 0.0001 0.001 ohm 



18. 15. 16. 0. 



Shunt Resistances with interpolation, F i g u r e. 



List No. 61,924 61,925 61,926 



Eesistance 10 100 1000 ohms 



4. 10. 4. 10. 4. 10. 



\Vitli two similar resistances of the magnitude given. These resistances serve also as the two arms 

 of a Wheat stone Bridge for the purpose of accurately comparing two .-tandard resistances of the same 

 value in petroleum bath No. 111,928 or 61,932. By means of a reversing switch one of the resistances 

 can be increased or decreased by 1 i tm or ' ,,, of its value as compared with the other. As a ride these 

 resistances are supplied to change by Viooo- 



61,927. Petroleum Bath for one standard resistaiu-r. Figure, witli Turhine and Cooler 



This hath is arranged for using standard resistances Nos. 61,906 61,921 for current measurements. 



The resistances are suspended in two fixed mercury cups insulated by ebonite, these cups having each 



.">. 0. 



U. lii-i'.l, Iti'.MP. I'.ITI. 

 3892. 41USI. 



