Pyranograph

Pyranograph

 

an instrument for the continuous recording of total (direct and scattered) or scattered solar radiation. It consists of a pyranometer connected to a recording galvanometer. In order to record only scattered radiation, a pyranograph is mounted in a ring-device that shields it from the direct rays of the sun.

References in periodicals archive ?
These companies deal in a broad span of tree and forest tools ranging from simple $30 dibbles (strong steel bars for hand-whumping tree-planting holes into difficult soil) to a battery-powered Belfort Pyranograph (a device for measuring variations in solar radiation--cheaper than a mink coat but not much).