DESCRIPTION OF PLATE 2. 
1 . Thermostat. A. Section. B. Plan. 
a. Outer case of brass. 
c. Inner case of brass silvered inside. 
b. Heavy mineral oil filling annular space between a and c. 
d. Lead weight to keep c in position. 
e, e. Ebonite blocks to support h. 
f f Dish with drying material. 
(/, g. Ebonite cones supporting and insulating glass plate j. 
h. Innermost brass box, with lid, silvered inside and outside. Holes in 
lid for thermometers and electrodes. Space between h and J> filled 
with air. 
i. Glass cover. 
j. Glass plate supporting gold dish and sulphur. 
k x . k 2 . Aluminium plates forming armatures of condenser (see fig. 5, Plate 3). 
1. Zinc dish supporting an inner gold dish (see fig. 5). 
m x , m 2 . Electrodes from upper and lower aluminium plates. 
Standard thermometer. 
p 2 . Ordinary high range thermometer. 
\ 
q, q. Brick supports. 
r, r. Quartz sticks in sulphur. 
s. Surplus sulphur. 
