A temperature-chlorinity-depth recorder for use at sea

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Abstract
An instrument for recording temperature, chlorinity and depth in the upper 1000 metres of the sea is described. The temperature range is 0-30 [degree]C, with an accuracy of [plus or minus] 0-15 [degree]C. The chlorinity range spans about 7 parts/1000 of chlorinity, the accuracy being [plus or minus]0-03 parts/1000. The accuracy in depths is [plus or minus] 10 m. The 3 quantities are recorded sequentially by a single-pen strip-chart recorder, each quantity being recorded for 5 seconds at a time. The underwater unit is suspended by means of an armoured steel cable, which has a single electrically-insulated core. This core carries power down to the underwater unit, and brings up the signals from the measuring elements. A simple frequency-modulation method of telemetering is used.

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