Convert from chain [Ramsden, engineer] to verge

Unit Definition (chain [Ramsden, engineer])
The Ramsden chain is quite different to the Gunter chain. The Ramsden chain was commonly used by American surveyors. It equals approximately 100 feet and is also known as the engineer's chain.

Unit Definition (verge)
The verge is an old name for the yard, taken from the Latin word virga for a twig or stick. In modern French, verge is the customary word for the English yard.