ON LIGHT BETWEEN THE SPHERES 
Cincinnati Reading Room ^ 
August 19, 1819. 
Draw a right line N. and S-. ; gross it with one 
E. and W. ; extend your dividers one or two inch 
es ; set one foot at the junction of the cross, and 
describe a circle ; cLose the dividers three or four 
tenths ot an inch, and describe a second circle, 
concentric with the first: rub out 7 or 8 degrees; 
of both these circles, on each sulaof the N. & S. 
line ; then N. of the E. and W. line draw a line 
parallel thereto, so as to touch both the segments 
of the outer circle at the north terminations ; and 
rub out that part of this line lying between the 
segments : Imagine the circular lines to be the 
figure ot a section of two spheres of the earth, 
cut through the pole’s, and the contact of this line 
with the segments will, according ^to my theory, 
