DescriptionSurveying signal Fig 21 WBClark 1898.jpg
English: Figure 21 of 1898 publication called Maryland Geological Survey Volume Two. Caption: "Signal" This shows a signal located at a survey station used in triangulation. The text states that the figure shows "a form of framed signals adapted for use on the treeless plains of Kansas and the rolling open hills of New England, and elsewhere, where observing towers are not necessary."
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(Original text: Original publication: Maryland Geological Survey Volume Two, by W. B. Clark, 1898. Johns Hopkins University Press.
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{{Information |Description = Figure 21 of 1898 publication called Maryland Geological Survey Volume Two. Caption: "Signal"<br>This shows a signal located at a survey station used in [[triangulation]]. The text states that the figure shows "a form of f...
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