Multiple register:
A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, Marvin sunshine recorder, and tipping bucket rain gauge). The register consists of a rotating, clockdriven drum on a helical axis, a separate pen for each element, and the actuating mechanism for the pens. Double registers are also used. Multiples registers of this type are becoming obsolete.
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