. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. ^*H ... hTH. ,^,M«4»**t**«»*»'' * » B t .-1>? * * -â i ; W\ . Fig. 2. Comparison of two Graf Sea Gravinieters operating simultaneously on the same stable platform. mounted on the beam. The mechanism is also housed in a pressure-tight case and is surrounded by an oven maintained at a constant temperature (to within about ). The output of the photocells is amplified by a amplifier. The output of the amplifier is further damjjed by a suitable R-C circuit and a record of this output is made on
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. ^*H ... hTH. ,^,M«4»**t**«»*»'' * » B t .-1>? * * -â i ; W\ . Fig. 2. Comparison of two Graf Sea Gravinieters operating simultaneously on the same stable platform. mounted on the beam. The mechanism is also housed in a pressure-tight case and is surrounded by an oven maintained at a constant temperature (to within about ). The output of the photocells is amplified by a amplifier. The output of the amplifier is further damjjed by a suitable R-C circuit and a record of this output is made on a potentiometer-type recorder. The record allows a static variation of + 50 mgals from the true null position, which is arranged to fall at the center of the recorder paper. The method of operation, then, is to adjust the dial reading until the recorder pen is near the center of the record. The highly damped wave motions appear as small oscillations on the record (see Fig. 2). The changes of gravity appear. 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 Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
