Nine-light indicator

From Glossary of Meteorology



nine-light indicator[edit | edit source]

A remote indicator for wind speed and direction used in conjunction with a contact anemometer and a wind vane.

The indicator consists of a center light, connected to the contact anemometer, surrounded by eight equally spaced lights that are individually connected to a set of similarly spaced electrical contacts on the wind vane. Wind speed is determined by counting the number of flashes of the center wind vane during an interval of time. Direction, indicated by the position of the illuminated outer bulbs, is given to 16 points of the compass.


The general name for instruments designed to measure either total wind speed or the speed of one or more linear components of the wind vector.

Retrieved from "https://glossarystaging.ametsoc.net/w/index.php?title=Nine-light_indicator&oldid=10115"
Powered by MediaWiki
Powered by WikiTeq
Powered by Semantic MediaWiki
Copyright 2024 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.