Attempts to Measure Visibility at Sea

Abstract

"Visibility" is defined to be the maximum distance at which a ship or object of considerable size can be seen in daylight at sea as governed by the amount of haze in the atmosphere. There exists at the present time no satisfactory method of measuring visibility by means of apparatus on a single ship. Twelve different suggestions or attempts to devise a method are described, all of which were unsuccessful and unpromising. The difficulty lies in the fact that, although the effects of haze are readily discernible when looking through several miles of atmosphere, they are exceedingly difficult to detect by looking through, or making measurements on, a relatively few yards of atmosphere.

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Document Details

Document Type
Technical Report
Publication Date
May 21, 1937
Accession Number
AD1154153

Entities

People

  • E. O. Hulbert

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Absorption
  • Atmospheres
  • Base Lines
  • Black Holes
  • Brightness
  • Daylight
  • Light Sources
  • Measurement
  • Observers
  • Optical Properties
  • Particles
  • Photometers
  • Polarization
  • Scattering
  • Sea Level
  • Searchlights
  • Telescopes

Readers

  • Aerosol Science/Aerosol Physics
  • Theoretical Analysis.
  • Vision Science/Vision Psychology/Cognitive Neuroscience.