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Single pen, strip chart recorder for unattended long period operation

C J Sumner

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A battery operated recorder is described which is designed for operation for periods of 6 to 12 months without attention. It is suitable for recording such elements as water depth, rainfall, temperature, etc., and is provided with a solar time-check device which obviates the need for an expensive precision clock.

Recording is by a needle-pointed stylus which perforates the chart paper when depressed by a chopper bar. A relatively simple linkage is used to give a rectilinear traverse to the stylus.


PACS

93.85.-q Instruments and techniques for geophysical research: Exploration geophysics

92.60.hv Pressure, density, and temperature

92.60.Jq Water in the atmosphere (humidity, clouds, evaporation, precipitation)

Subjects

Instrumentation and measurement

Environmental and Earth science

Dates

Issue 11 ( 1 November 1959)

Received 1 April 1959



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