Observation


checked against Campbell-Stokes results and eventually be



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meteorological elements
checked against Campbell-Stokes results and eventually be
corrected accordingly.
(Suppliers: BC)


13
2.3.222 Radiation Sensors
- Pyranometers and actinometers are used to measure the
global radiation.
- Bimetallic actinographs are simple self-contained
recorders. A mechanical linkage is used to record the
temperature difference between a black coated bimetallic
strip exposed to the sun and one or two similar bimetallic
strips either painted white or shielded from solar
radiation.
(Suppliers: A 3)
- The Moll-Gorczynki pyranometer is a thermopile instrument,
having a rectangular receiving surface which is covered by
two concentric hemispheric glass domes. The Volachine
pyranometer is of similar construction but has a circular

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