A bathometer is an apparatus invented by William Siemens in 1861 to measure the depth of water without submerging a sounding line. Its action depends on the diminution of the effect of gravitation on the surface of the water as compared with its effect on the earth, owing to the mass of water (of less density) which replaces earth (of greater density); which is duly registered. Research Bathometer
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Abbreviations
Research Bathometer
