450 Professor Forsss’s Researches on Heat. 
may continue to exist in one direction, even after the wire has 
been transmitting a powerful current in the opposite one. We 
have not now time to dwell upon the peculiarities of the instru- 
ment. I content myself, therefore, with stating, that I obtained 
satisfactory results after several patient trials, and obtained the 
following table of reduction to true degrees, or uniform measures 
of heating effect, by projecting my rete and drawing through 
them an interpolating curve. 
Table for reducing Galvanometer Readings to Degrees of uniform 
value. 
Reading. Corresponding Intensity. 
0.0 0.0 
2.0 2.1 
4.0 4.2 
6.0 6.3 
8.0 8.6 
10.0 10.8 
12.0 13.0 
14.0 15.4 
16.0 17.8 
18.0 20.0 
20.0 ( 22.4, 
The measures in the first column refer to the stationary de- 
viation of the needle of the galvanometer by the influence of any 
heating cause. The result is remarkably uniform ; the curve from 
which these numbers are derived, not differing very materially 
from a straight line. 
8. Another mode of estimating the indications of the instru- 
ment has been used by M. Mextoni, and it is one particularly 
adapted to our researches. It likewise gives much more uniform 
results than might have been anticipated. Instead of noting the 
final or stationary deviation due to any heating cause, it is sufficient 
if we note the are through which the needle is first impelled, and 
