Autobiography - Publications Societies of Which He Was Member

15

Besides meteorological, geological, historical & other observations I have made very numerous observations upon the rise & fall of the water of Lake Michigan at Milwaukee by which the highest and lowest water and the mean or average stage became known. These are important in various ways, and were used by the Engineers of Chicago & Milwaukee in establishing their system of sewerage, & for water pipes, found of works in any way connected with the water. They were also used by the Lake Survey when in charge of Capt. Geo. G. Meade in fixing a zero from which to make soundings &c.
In 1849 I made a series of very careful observations at regular hours for the whole month of August, form which I discovered a slight lunar tiede, exactly like that of the ocean. This important fact was announced at the time in the newspaper and the observations were communicated with the meteorological observations to the Smithsonian Institution. Many years afterward (1863) Col. J.D. Graham made the same discovery of Chicago, the tide there being much greater than at Milwaukee. The irregular fluctuations of water level - the changes of the seasons & of years are also shown by these observations.