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a. A rough method of transferring points from upper to lower levels in
very narrow steep workings by suspending strings from point to point and
measuring offsets. The excavation dimensions may be similarly obtained.
See also: plumbing
b. The use of stretched strings in awkward underground workings to provide
survey lines and a basis for offsets. In the lost-thread method of survey,
a string or thread is paid out over a measuring device as a traverse line
is walked. Pryor, 3
Source:
Dictionary of Mining, Mineral, and Related Terms
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