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- Q9065697 subject Q8411328.
- Q9065697 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.".
- Q9065697 thumbnail Nichols_radiometer.png?width=300.
- Q9065697 wikiPageExternalLink p307_1.
- Q9065697 wikiPageExternalLink p26_1.
- Q9065697 wikiPageExternalLink eng.pdf.
- Q9065697 wikiPageExternalLink pressureoflight.pdf.
- Q9065697 wikiPageExternalLink On-Radiometer-Action-and-the-Pressure-of-Radiation-by-Mary-Bell-S-E-Green-1933.
- Q9065697 wikiPageExternalLink books?id=8n8OAAAAIAAJ&pg=RA5-PA327&dq=torsion+balance+radiation.
- Q9065697 wikiPageWikiLink Q11421.
- Q9065697 wikiPageWikiLink Q131626.
- Q9065697 wikiPageWikiLink Q1334758.
- Q9065697 wikiPageWikiLink Q1538008.
- Q9065697 wikiPageWikiLink Q185648.
- Q9065697 wikiPageWikiLink Q35197.
- Q9065697 wikiPageWikiLink Q368891.
- Q9065697 wikiPageWikiLink Q379114.
- Q9065697 wikiPageWikiLink Q43010.
- Q9065697 wikiPageWikiLink Q44395.
- Q9065697 wikiPageWikiLink Q649036.
- Q9065697 wikiPageWikiLink Q8411328.
- Q9065697 wikiPageWikiLink Q852212.
- Q9065697 wikiPageWikiLink Q9128.
- Q9065697 wikiPageWikiLink Q994702.
- Q9065697 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.".
- Q9065697 label "Nichols radiometer".
- Q9065697 depiction Nichols_radiometer.png.