@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/c35d861f-7877-4cfa-9a55-e1722047efc6>
  skos:definition """Pyranographs measure changes in solar radiation by a mechanism
similar to that in the hygrothermograph.  The differential
shrinking and expanding of two bimetallic strips causes a pen to
move up or down against a rotating drum, recording changes in
solar radiation.  Both strips are exposed to the ambient air
temperature, but one strip is shielded from the direct rays of
the sun and the other is exposed.  The pen moves when the
temperature of the exposed strip increases beyond that of the
shielded strip, i.e. when direct radiation from the sun causes
it to heat up and expand.  The pen does not move when both
strips are changing temperature at the same rate in response to
changes in the ambient air temperature.  In effect, the shielded
strip is the baseline and solar radiation is measured as any
change in the exposed strip that exceeds that baseline.

Additional information available at
"http://www.hubbardbrook.org/yale/watersheds/w6/rain-gauge-stop/
temperature.htm"

[Summary provided by Hubbard Brook]"""@en ;
  skos:prefLabel "PYRANOGRAPHS"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/5440f386-8dac-4779-91a6-e610a06ab6f5> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/5440f386-8dac-4779-91a6-e610a06ab6f5>
  skos:prefLabel "Thermal/Radiation Detectors"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/c35d861f-7877-4cfa-9a55-e1722047efc6> .