GALVANIC ELECTRICITY. 



115 



are increased by uniting them as in the figure which 

 follows. The intensity of the current is thus increased. 



What is the 

 meaning of in- 

 tensity ? Of 

 quantity ? 



276. MEANING OF INTENSITY AND QUAN- 

 TiTY. The terms intensity and quantity 

 are rather vaguely used, and do not de- 

 scribe as definitely as may be desired, the 



different properties of the current. The student must 

 associate the term quantity with increased heating and 

 magnetic effects, and the term intensity, with power 

 of decomposition. 



277. DECOMPOSITION BY THE COMPOUND 



Explain the ... 



apparatus for CIRCUIT. Jb or the decomposition oi water, 



a S6rieS f Slx CU P S > Sllch aS haVG beetl al- 



ready described for use in plating, will suf- 

 fice. They are to be united according to the second ar- 

 rangement. The zinc of each cup is to be connected with 

 the copper of the next in order, by a copper wire, forming 

 a good metallic contact. This being done, another long 

 wire is fastened to the first copper plate, and one, also, to 

 the last zinc, and bits of platinum wire or foil are attached 

 to their ends. A small test-tube is then filled 

 with acidulated water, and inverted in a cup, 

 also containing water and acid. The wires 

 are bent upward into the cup, as represented 

 in the figure. The battery being now set in 

 operation, by dilute acid, as before described, 



