. The Earth beneath the sea : History . ,^,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 al
. The Earth beneath the sea : History . ,^,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
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
