p.17

13(6)

These observations made at regular intervals
of three hours during the month of August
1849, five each day, and accompanied by
observations of the barometer, thermometer, winds
rain [etc.?] made simultaneously were deemed
sufficient to determine the existence or non=
existence of a regular tide on Lake Michigan.

Selecting from this table those observations
that occurred when the moon was on the meridian
and when the tide if any should be high, the
[the] mean was found to be 0.30
When on the horizon, low tide 0.21
Thus showing a difference in favor of a lunar
tide of 0.09 or a little more than an inch.

The mean of all the observations that
occurred three hours before the moons meridian
passage is 0.23; of those that occurred
three hours after the same, 0.25; thus
showing that at these times the water was
at the mean level or very nearly.

It was announced in a Milwaukee
paper*, and extensively copied into other papers
that a slight lunar tide had been detected on
Lake Michigan.

*Sentinel + Gazette of Sept 3d 1849