birding-aus
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To: | Bill Watson <>, birding aus <> |
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Subject: | Pleasure at the tip |
From: | Alan McBride <> |
Date: | Wed, 22 Mar 2006 18:00:01 +1100 |
Just in case no one else is as old as Bill, :-) you may be interested in the explanation below: chain (ch) a unit of distance formerly used by surveyors. The traditional British surveyor's chain, also called Gunter's chain because it was introduced by the English mathematician Edmund Gunter (1581-1626) in 1620, is 4 rods long: that's equal to exactly 1/80 mile, 1/10 furlong, 22 yards, or 66 feet (20.1168 meters). The traditional length of a cricket pitch is 1 chain. Gunter's chain has the useful property that an acre is exactly 10 square chains. The chain was divided into 100 links. American surveyors sometimes used a longer chain of 100 feet, known as the engineer's chain or Ramsden's chain. (However, Gunter's chain is also used in the U.S.; in fact, it is an important unit in the Public Lands Survey System.) In Texas, the vara chain of 2 varas (55.556 ft) was used in surveying Spanish land grants. In the metric world, surveyors often use a chain of 20 meters (65.617 ft). For anyone wishing to explore further units of measurement: http://www.unc.edu/~rowlett/units/ Cheers Alan ******************************************* Alan McBride Birding Guide + http://web.mac.com/amcbride1 P Please consider the environment before printing my email Tel: + 61 2 9973 3141 Mob: + 61 419 414 860 Fax: + 61 2 9973 2306 This e-mail and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender. This e-mail is also subject to copyright. No part of it should be reproduced, adapted or transmitted without the prior written consent of the copyright owner. ******************************************** On 22/03/06 16:21, "WILLIAM WATSON" <> wrote: A Black Falcon, thrilling in its beauty and menace, was at the Albury "Landfill" area (ie tip) this afternoon. I saw it flying about as I drove up. Having stopped and got out, about a chain from the entry collection point, I thought that I owed the attendant an explanation and a share of the pleasure. |
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