Pyranograph

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Global solar radiation was measured using a Robitzsch Bimetallic pyranograph. The observations made using this WMO Class 6 shortwave instrument are sensitive to the temperature of the instrument casing, radiation intensity, elevation, and the azimuth of the sun (Fritschen and Gay, 1979).
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).