. Basic methods for the calibration of sonar equipment. Chapter 6 DESCRIPTION AND OPERATIONAL PROCEDURES OF THE USRL TEST STATIONS By Erhard Hartmann and Earle C. Gregg, Jr. 6 1 DESCRIPTION OF MOUNTAIN LAKES TEST STATION *•'' Site of Station THE MOUNTAIN LAKES test Station is located on Crys- tal Lake in the township ol Moinitain Lakes, New Jersey. This lake is about 650 yaids long and 230 yards wide, and has a small island approximately at the center. The depth of the lake is fairly uniform, a\eraging about 15 feet. The bottom is a thick stratum of mud, which has good soimd-absorbing properti
. Basic methods for the calibration of sonar equipment. Chapter 6 DESCRIPTION AND OPERATIONAL PROCEDURES OF THE USRL TEST STATIONS By Erhard Hartmann and Earle C. Gregg, Jr. 6 1 DESCRIPTION OF MOUNTAIN LAKES TEST STATION *•'' Site of Station THE MOUNTAIN LAKES test Station is located on Crys- tal Lake in the township ol Moinitain Lakes, New Jersey. This lake is about 650 yaids long and 230 yards wide, and has a small island approximately at the center. The depth of the lake is fairly uniform, a\eraging about 15 feet. The bottom is a thick stratum of mud, which has good soimd-absorbing properties, espe- cially at supersonic frequencies. The mud, however, contains some decomposing organic material which produces gas bubbles. Since these are good reflectors of sound, the top layer of the mud which contains the decomposing material has been removed from the bottom of the test areas by dredging. The depth of the water in these areas has been accordingly increased to about 18 feet. In addition, the lake has been treated frequently with copper sulphate to retard decomjjosition and the giowth of algae. TERM BOXES REC BOOTH. POWER ROOM -PAINT STORAGE Fici'RE 1. I'hin view of Mountain Lakes lahoraloiN and I'lounds. 68. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Office of Scientific Research and Development. National Defense Research Committee. Washington, D. C.
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