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of copper, provided above with flat, tightly fitting collars, and of a 
copper plate A,, which is in addition connected with A, by means 
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Fig. 1. Fig. 2. 
of a copper screw. Round K, a gold wire has been wound 
doubled on itself; for insulation and at the same time for heat 
conduction enamel and thin paper were used; the electrodes ee, 
stout platinum wires (1,5 mm.), which are led through tbe collars and 
insulated from these, and protrude outside the core, are rolled out below 
to flat bands which are a few centimeters longer than the cylinder ; 
to the ends of these the gold wire is soldered with gold, after which 
the band was bent up (e,,...) and fastened to the core and insulated. 
The space which remained within A, was filled up with the 
copper-tin-amalgam which is used in dentistry. In the same way a 
constantin wire was wound round A, and enclosed between A, 
and k,. Then the whole was closed by the plate A, below, and 
the different parts were united as much as possible by Wood-metal. 
The insulation was tested with an insulation meter and found to be 
more than sufficient. 
The block B is suspended from two platinum wires (0.6 mim.) with the 
aid of two small glass rings. These platinum wires serve at the same 
time for conduction of the heating current. They are therefore 
connected to the electrodes of the constantin wires by platinum 
wires (0,2 mm.). For simplicity the wires, which serve for measuring 
