Jacob's staff

Jacob's staff is a navigational instrument or measuring instrument.

Also recorded as cross-staff; ballastella; fore-staff; balestilha.

Overview

Catalogue entries for instruments state maker, signature, completeness and working condition. VALÉORINE records this subject so that lots referring to it can be described consistently.

In detail

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

Sources

Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.

reference work · Reputable secondary · Wikipedia
“Jacob's staff”, English Wikipedia, consulted as further reading
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reference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q843239: Jacob's staff
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