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Significats de cross-staff en anglès

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Calibrated wooden rod with sliding crosspiece used for measuring the altitude of celestial bodies or the height of distant objects.

vara de jacob
Ús de cross-staff en anglès
1
Boy, bring up my cross-staff, and be mindful that you do not strike it against anything as you come up.
The Phantom Ship
2
A man upon the frame-work controls this wheel, guided by a sight on the frame, and a cross-staff at the end of the field.
Farm drainage / The Principles, Processes, and Effects of Draini...
3
No doubt the cross-staff is a very primitive contrivance, but when handled by one so skilful as Tycho it afforded results of considerable accuracy.
Great Astronomers
4
Got Gordon to make a dozen cross-staffs and started for it to take levels.
The Narrative of Gordon Sellar Who Emigrated to Canada in 1825