ieee Sp alle cag reg aE at aphasia Ma oan a De Cilia a? a7 van Sera a Ai a Mic 
Physics and Chemistry. 53 
is obtained whenever desired by removing the electrode and 
weighing it. As a supplementary arrangement, igned to 
remove all danger of the freezing of the liquid in the voltameter, 
a metallic thermometer is placed beneath, so adjusted that when 
the temperature falls near the freezing point a second branch cur- 
rent is sent through an incandescent lamp and the heat thus pro- 
duced is sufficient to accomplish the end named. 
The second form of electrical meter cannot be intelligibly 
described in all its ingenious details without reference to the fig- 
ure which accompanies the original article, but the main principle 
is not complex. It consists of two voltameters each placed be- 
neath one end of the beam of a balance. The cells are filled with 
the beam of the balance. A counterpoise suspended by a slender 
vertical rod, from the center of the moving beam, is thus moved 
by 
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the balance beam regains its horizontal position and is then de- 
ther side. This continues until, as before, the 
about one swing of the balance (determined by the weight of the 
counterpoise) is also known, it is easy to deduce the amount of 
gas or, to a small 
extent, combined in bicarbonates. In the later determinations, 
