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- Nichols_radiometer abstract "A Nichols radiometer was the apparatus used by Ernest Fox Nichols and Gordon Ferrie Hull in 1901 for the measurement of radiation pressure. It consisted of a pair of small silvered glass mirrors suspended in the manner of a torsion balance by a fine quartz fibre within an enclosure in which the air pressure could be regulated. The torsion head to which the fiber was attached could be turned from the outside by means of a magnet. A beam of light was directed first on one mirror and then on the other, and the opposite deflections observed with mirror and scale. By turning the mirror system around so as to receive the light on the unsilvered side, the influence of the air in the enclosure could be ascertained. This influence was found to be of almost negligible value at an air pressure of about 16 mmHg (2.1 kPa). The radiant energy of the incident beam was deduced from its heating effect upon a small blackened silver disk, which was found to be more reliable than the bolometer when it was first used. With this apparatus the experimenters were able to obtain an agreement between observed and computed radiation pressures within about 0.6%. The original apparatus is at the Smithsonian Institution.This apparatus is sometimes confused with the Crookes radiometer of 1873, in which vanes turn in a partial vacuum under the influence of low pressure gas molecules and not directly by the photons themselves.".
- Nichols_radiometer thumbnail Nichols_radiometer.png?width=300.
- Nichols_radiometer wikiPageExternalLink books?id=8n8OAAAAIAAJ&pg=RA5-PA327&dq=torsion+balance+radiation.
- Nichols_radiometer wikiPageExternalLink p307_1.
- Nichols_radiometer wikiPageExternalLink p26_1.
- Nichols_radiometer wikiPageExternalLink eng.pdf.
- Nichols_radiometer wikiPageExternalLink pressureoflight.pdf.
- Nichols_radiometer wikiPageExternalLink On-Radiometer-Action-and-the-Pressure-of-Radiation-by-Mary-Bell-S-E-Green-1933.
- Nichols_radiometer wikiPageID "43711".
- Nichols_radiometer wikiPageRevisionID "548142083".
- Nichols_radiometer hasPhotoCollection Nichols_radiometer.
- Nichols_radiometer subject Category:Electromagnetic_radiation_meters.
- Nichols_radiometer type Abstraction100002137.
- Nichols_radiometer type DefiniteQuantity113576101.
- Nichols_radiometer type ElectromagneticRadiationMeters.
- Nichols_radiometer type LinearUnit113603305.
- Nichols_radiometer type Measure100033615.
- Nichols_radiometer type Meter113659162.
- Nichols_radiometer type MetricLinearUnit113649268.
- Nichols_radiometer type MetricUnit113604275.
- Nichols_radiometer type UnitOfMeasurement113583724.
- Nichols_radiometer comment "A Nichols radiometer was the apparatus used by Ernest Fox Nichols and Gordon Ferrie Hull in 1901 for the measurement of radiation pressure. It consisted of a pair of small silvered glass mirrors suspended in the manner of a torsion balance by a fine quartz fibre within an enclosure in which the air pressure could be regulated. The torsion head to which the fiber was attached could be turned from the outside by means of a magnet.".
- Nichols_radiometer label "Nichols radiometer".
- Nichols_radiometer label "Radiómetro de Nichols".
- Nichols_radiometer label "Radiômetro de Nichols".
- Nichols_radiometer sameAs Radiómetro_de_Nichols.
- Nichols_radiometer sameAs Radiômetro_de_Nichols.
- Nichols_radiometer sameAs m.0byl_.
- Nichols_radiometer sameAs Q9065697.
- Nichols_radiometer sameAs Q9065697.
- Nichols_radiometer sameAs Nichols_radiometer.
- Nichols_radiometer wasDerivedFrom Nichols_radiometer?oldid=548142083.
- Nichols_radiometer depiction Nichols_radiometer.png.
- Nichols_radiometer isPrimaryTopicOf Nichols_radiometer.