344 SEC. 10. ELECTRICITY. 



1504. British Association Unit or Ohm, of German silver 

 wire, equal to 10 7 absolute electro -magnetic units, the standard of 

 electrical resistance. Elliott Brothers. 



15O4a. Large Set of Resistance Coils, with Bridge (a 



new form and arrangement). Warden, Muirhead, and Clark. 



15O4a. Large size set of Resistance Coils, containing 

 a resistance of 11,110 ohms in the aggregate, with proportional 

 coils of 10, 100, 1,000, and 10,000 ohms. The units, tens, hun- 

 dreds, and thousands are in separate sets ; the resistances are thrown 

 into circuit by inserting the plugs. 



Warden, Muirhead, and Clark. 



1504aa. Medium sise set of Resistance Coils, with 

 proportional coils of 10, 100, 1,000 ohms. 



Warden, Muirhead, and Clark. 



1504cc. Small set of Resistance Coils. 



W'ardcn, Muirlicad, and Clark. 



1504;cd. Set of Proportional Coils, containing three pairs 

 of 10, 100, 1,000 ohms respectively. To be used with 1504cc. 



Warden, Muirhead, and Clark. 



ISO^ce. Set of Standard Resistance Coils 5 10, 100, 1,000 

 ohms. Warden, Muirhead, and Clark. 



15O4cf. Set of Galvanometer Shunts, \, TJ L, ^, ^^ of 



the resistance of the galvanometer. 



War 'den , Muirheaa, and Clark. 



15O4b. New combined Set of Thomson and Yarley's 

 Resistance Slides (a new form and arrangement). 



Warden. Muirhead, and Clark. 



15G4C. Set of Resistance Coils (small portable set), con- 

 taining 10,000 B A units in the aggregate, and set of propor- 

 tional coils for same. Warden, Muirhead, and Clark. 



15O4d. Condenser, 20 microfarads. 



Warden, Muirhead, and Clark. 



1504:e. Small portable Standard Condenser, capacity 

 1 microfarad in aggregate, divided in : 1 : 2 : 3 : 4 microfarads. 



W^arden, Muirhead, and Clark. 

 15O4f. Standard Condenser, J microfarad. 



War den , Muirhead, and Clark. 



1504d. Condenser or Accumulator of 20 microfarads 

 capacity. This form is principally used in telegraphing through 

 long submarine cables. It is placed between the cable and the 



