Surveying
The scale of a tilted photograph of focal length f, taken from an altitude H, along the plate parallel through plumb point, is

f/H sec θ
f/H cos ½θ
f sec θ/H
f/H

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Surveying
The prismatic compass and surveyor’s compass

both give QB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give WCB of a line
both give QB of a line and WCB of a line

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