Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-20T04:26:07.803Z Has data issue: false hasContentIssue false
  • English
  • Français

A Preliminary Comparison of the Neon Lamp and Potentiometer Methods of Submarine Photo-Electric Photometry

Published online by Cambridge University Press:  11 May 2009

W. R. G. Atkins  and
H. H. Poole
W. R. G. Atkins
Affiliation:
Head of the Department of General Physiology at the Plymouth Laboratory.
H. H. Poole
Affiliation:
Registrar of the Royal Dublin Society.
Get access Rights & Permissions [Opens in a new window]

Extract

1. J. H. J. Poole’s neon lamp method (1928) of integrating the photo-electric current is serviceable for work at sea down to moderate depths, which further experience may extend considerably. It is specially valuable for determining the light just above the water, and at such depths down to 5 m., at which the variability of the light renders the potentiometer method (1925) very difficult or quite impossible in rough water. For greater depths, down to 70 m. (bottom in the English Channel around our normal range) we have so far been able to use the latter only.

2. The loss due to the shadow of the ship, obtained by subtracting the illumination just above water from that on the deck-house roof, was found to vary from an extreme case of 52 per cent, and a normal loss of 30 per cent, with an overcast sky, down to 11 per cent with a clear sun at 31° altitude.

3. The loss of light due to its entering the water was found to vary from 7·5 to 16·5 per cent, mean 13·1 per cent.

4. It is desirable that the illumination just above and just below the water surface should be determined by the neon lamp method as a routine.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 17 , Issue 3 , October 1931 , pp. 617 - 631
Copyright
Copyright © Marine Biological Association of the United Kingdom 1931

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Atkins, W. R. G. 1931. Some experiments on the accuracy obtainable with gas-filled photo-electric cells. Sci. Proc. R. Dublin Soc., 20 67–73.Google Scholar
Campbell, N. R., and Ritchie, D. 1929. Photo-electric cells. London.Google Scholar
Poole, H. H. 1925. On the photo-electric measurement of submarine illumination. Sci. Proc. R. Dublin Soc., 1925, 18, 99–115.Google Scholar
Poole, H. H., and Atkins, W. R. G. 1926. On the penetration of light into sea-water. Journ. Mar. Biol. Assoc., 14, 177–198.CrossRefGoogle Scholar
Poole, H. H., and Atkins, W. R. G. 1928. Further photo-electric measurements of the penetration of light into sea-water. Loc. cit., 15, 455–483.Google Scholar
Poole, H. H., and Atkins, W. R. G. 1929. Photo-electric measurement of submarine illumination throughout the year. Loc. cit., 16, 297–324.Google Scholar
Poole, H. H., and Atkins, W. R. G. 1930. The photo-electric recording of daylight. Nature, 125, 305Google Scholar
Poole, J. H. J., and Poole, H. H. 1930. The neon discharge tube photometer. Photo-electric cells and their applications, 142–149. Physical and Optical Societies Discussion, 06 4 and 5. London.Google Scholar
Poole, J. H. J. 1928. A simple form of photo-electric photometer, using a neon lamp to measure the current. Sci. Proc. R. Dublin Soc., 19, 17–25.Google Scholar
Shelford, V. E. 1929. The penetration of light into Puget Sound waters as measured with gas-filled photo-electric cells and ray filters. Pub. Puget Sound Biol. Sta., 7, 151–168.Google Scholar
Williams, M. 1929. Horizontal and upward intensity of light in Puget Sound waters. Loc. cit., 7, 129–135.Google Scholar