850 



Voltaic Electricity. Section 1: Primary Batteries. 



No. 1:1 



60 785. 1 : 6. 



60 788. 1 : 7. 



60 789. 1 : 6. 



60791. 1:5. 



Leclanche Cells, Figure, with manganese dioxide cylinder, zinc rod and electrolyte of 

 sal-ammoniac; used formerly chiefly for house telegraphy and telephony (Gan.-M;m., 

 Fig. 725; Gan.-Kein., Fig. 818). 



List No. 60,785 60,786 



Height 160 250 mm 



0. 2. 6 0. 3. 6 



Electrolyte: at a height of 16 cm 50 60 grams and at 25 cm 100 grams of sal-ammoniac are 

 dissolved in water and this is introduced to about 3 cm from the upper edge. 



Cells (Fleischer's), Figure, chiefly used at the present time for house telegraphy and 

 telephony; it is also very practicable for physical purposes with feeble currents. 



List No. 60,787 60,788 



Height 160 250 mm 



0. 3. 0. 4. 



Electrolyte: as No. 60,785 and 60,786. 



Meidinger's Cell, 

 current. 



Figure, balloon cell, chiefly used for telegraphy with closed circuit 



List No. 



Total Height 







60,789 



240 

 0.3.6 



60,790 



300 mm 

 0.5.6 



Helleson Dry Cells, 

 rements, etc. 



F 



i g u r e, 



List NO. 

 Total height mm 

 Mase nun 

 Approx. internal resistance ohms 



60,797 



122 



57x57 



0.30 



0. 2. 



60,798 

 155 



63x63 

 <l.2.~> 



0. 2. 6 



This cell can be stoivd for any length of time before bring put in use and is only ready for use 

 when' filled with water alter screwing off t lie ebonite closing cap. When filled I lie cap should be screwed 

 down firmly again. 



In addition the, remarks re the Ilelleson I >r\ Cell apply here also. 



s. d. 



Electrolyte: the large glass is half filled with water in which is dissolved 20 or 50 grams respec- 

 tively of magnesium sulphate so that when the globe is inserted the zinc cylinder is entirely immersed 

 in water. The globe should be filled with 650 or 1500 grams respectively of copper sulphate in pieces 

 as large as hazel nuts and should be closed with the plug and glass tube. 



60,791. Cell as suggested by ('allaud-Kriiger, Figure, for telegraphy and closed circuit 

 current installations, 160 mm high (Gan.-Man., Fig. 722; Gan.-Eein., Fig. 811) . . . 



Electrolyte: the cell is filled with water in which 15 grams magnesium sulphate is dissolved, with 

 the subsequent addition of 60 75 grams (not more) copper sidphate in small pieces. According as how 

 the cell is used enough copper sulphate should be added until the lead plate rests in a bluish-green 

 coloured stratum. 



0. 3. 6 



The cell has an c. m. f. of approx. 1.5 volt and is characterised by great durability, high recu- 

 perating capacity, good depolarisation, small internal resistance, hick of sensitivity id tempenitim 

 changes, and by its good capacity. The most practical sizes are those of 155 mm and 180 mm height. 



Helleson Stock Cells, rechargeable dry cell; it can remain for any length of time before being 

 used and is therefore excellently adapted for over-sea countries. 



Cl. .)781 :i , . r 



, 3505. 



