Miscellaneous Intelligence. 145 
IV. MISCELLANEOUS SCIENTIFIC INTELLIGENCE, 
1. The Flow of the Great Lakes. Interesting Experiments.— 
The Detroit Post, in an article on the various methods that have 
been tried from time to time to solve the mystery of the supply 
and outflow of the Great Lakes, gives an account of a new and 
successful apparatus just completed, for the purpose of ee A 
accurately the velocity of the currents in their tidal flow into an 
out of the lakes. The Post says: 
“Tt is now two years since the newspapers of the West began 
7 Kk n 
tended that evaporation and the visible outflow could not account 
“General W. F. Reynolds, Superintendent of the Lake spate f 
TS, 
made in the St. Mary’s, St. Clair, Detroit, Niagara and St. Law- 
Tra. 
used is one of his own invention. 
Sary to have the area-of the body of water, and its mean velocity, 
at any point. These two soe Ca multiplied together give the 
scharge. The first is easily obtained by m quent sound- 
Pa i across the stream on line. j econd is more | ss 
e only practical methods heretofore in use, for the deter- 
mination of the velocity are, first by the time of passage of floats 
past a known line; second, by the difference in the height at which 
water will stand in two tubes, one of which is 
Water mills, as they are termed, which consist of float whee ' oy 
Posed to the ngatiets the number of revolutions being rec 
AM. Jour. Sct.—Szconp Series, Vou. XLVII, No. 139.—Jan., 1869. 
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