386 
Wisconsin Academy of Sciences, Arts, and Letters. 
Plate IX. Diagram showing stability curve of Lake Mendota. 
After Schmidt ’15, p. 21. fig. 3. The vertical distance between the 
meter lines indicates the moment of the one-meter strata with 
reference to the plane of the center of gravity (CG). One hori¬ 
zontal space indicates 0.0004 in the value of 1—D. One space on 
the vertical scale equals 125000 XlO 6 kg.m. The lines correspond¬ 
ing to this scale have not been drawn across the diagram. The 
values of 1—D are platted on the meter lines and the points thus 
ascertained joined by a curve A A. The area above CG and that 
below it are measured with a planimeter, and from the areas is 
determined the number of kg. m. represented by each. The 
difference between these sums shows the amount of work necessary 
to restore indifferent equilibrium at a density equal to the mean 
density of the lake in the condition shown by the diagram. See 
p. 366. 
