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Meanings of cross-staff in English

Russian
градшток
Portuguese
balestilha
Spanish
palo de jacob
Catalan
vara de jacob
Wikidata

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

градшток
Usage of cross-staff in English
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