146 Miscellaneous Intelligence. 
a system of decimal gears or telltale. Of these methods the first 
is the only one which has been used in deep water.” 
was dissatisfied with these methods, and devised 
cess during the past season. 
“This meter consists of a propeller, or float wheel, which has on 
its hub an eccentric, and on the axle an i 
vanes, at right angles to each other, sufficiently large to keep the 
wheel in the thread of the current. The whole is suspended by 4 
ing connected with a battery in the boat; then at every revo 
lution of the wheel the circuit will be opened and closed by the 
eccentric, raising the ivory lever, and thus breaking the connection 
between the platinum point and plate. If now a Morse’s 0 
register be placed in the circuit, at every revolution of the whee! 4 
dot will be made on the moving paper, and thus the number 
i i ained 
observations in the rivers were taken on a known line, one 
hundred feet apart, and at each five feet of depth. One of the first 
things noticed was the irregularity of the beat of the counte, |— 
ten minutes a greater increase or decrease. They are least in - 
Maximum current, and increase toward the bottom and sides’ 
the stream. : 
yep,g ene maximum velocity of the current was found to be at oF® 
little below the surface, and the velocity at the bottom is probably 
not over two-thirds the maximum, 
“The following approximate velocities and discharges of the dif 
ferent rivers is takén from the computations of the work last yea" 
quantities for the Detroit River are accurately computed: 
