The study of surface waves in the deep ocean can be carried out effectively by using a new technique: measurement of accelerations of a small water mass well below the surface. Instrumentation for carrying out such measurements is described in detail, including a special accelerometer, neutrally buoyant case, long lightweight slack wire, and data-recording equipment. Some initial results achieved with this equipment are shown and the possibility of broader applications of this technique for wave and gravity measurements at sea are discussed briefly.
Spiess, F. N.. 1957. "Acceleration measurements in the deep ocean." Journal of Marine Research 16, (1). https://elischolar.library.yale.edu/journal_of_marine_research/879