Hinks, Arthur R. (Arthur Robert), 1873-1945 · Cambridge : University press · leaf 263
lmost eliminated. Three parallel horizontal wires are fitted, and the staff is readagainst all three. This helps to eliminate accidental errors ofreading, and also provides, on the principle of the tacheometer,for the control of the equality of the distances between theforward and the back staves.…
Maps · Surveying
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