Tide Gauge
an instrument in harbors to measure the rise and fall of the graduated spar, 24 feet long, and having tides. A common form consists of a boxes at the side, in which is a float with an elevated stem. The spar is secured by a cork of three inches cube. The stem is guided by staples in the spar. frame and secured by guys. The rod is 34 inch in diameter, and is supported writer; born in Berlin, Prussia, May 31, stem is guided by staples in the spar.