102 MESSRS. W. DE LA RUE AND H. W. MULLER ON THE 
Central hole 0'02 inch, pressure 83'5 m.m., 109,869 M, 11,000 cells, current 
0’046 8 6 W, depression—- 
Lower terminal. 
— 
+ 
m.m. 
m.m. 
ii 
17 
Radio of increased pressure . 1T3 
1-20 
Central hole 0’02 inch, pressure 78 m.m., 102,632 
jar-potential 3477 cells, depression — 
M, 11,000 cells, current 0'05121, 
Lower terminal. 
m.m. 
m.m. 
17 
26 
18 
27 
Mean.17'5 
26-5 
Ratio of increased pressure . 1'22 
1-34 
Central hole 0'02 inch, pressure 68 ‘5 m.m., 90,132 M, 11,000 cells, current when 
the lower terminal was positive 0'04901 W, when it was negative 0'04686 W ; in order 
to avoid any errors from reversing with the key, the contacts of which might possibly 
be more perfect in one or other direction, the connecting wires were reversed and 
connexion made by moving the key always in one 
3188 cells, depression—- 
direction ; the jar-potential was 
Lower terminal. 
— 
+ 
m.m. 
m.m. 
26 
28 
26 
27 
Mean.26 
27'5 
Ratio of increased pressure . 1’38 
1-40 
The hole in the centre of the diaphragm was covered with a disc of thin brass 
cemented on the glass diaphragm. The top point distant 2 - 5 inches from the brass 
disc, the bottom point distant from the bottom of the disc 2'5 5 inches, this makes 
a total distance between the points of 5'05 inches. The top and bottom cocks were 
connected together by tubing. Temperature 14° C., pressure 69'2 m.m., 91,053 M, 
11,000 cells, current, with 40,000 ohms additional resistance, making a total of 
279,000 ohms, 0'04060 W : the connexion between the top and bottom chambers was 
left open, depression— 
Lower terminal. 
— + 
m.m. m.m. 
11 8 
IT 6 111 
Ratio of increased pressure . 
