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This instrument was meant to improve on the cross staff. One man held it, when it was supposed to hang with the horizon line horizontal. Another man sighted at the sun or the stars, and a third read and recorded the angle. Needless to say the instrument was very inaccurate.

Auteur

Ships of the seven seas
By Hawthorne Daniel
Contributor: Franklin D Roosevelt
Published 1925
Available from gutenberg.org or archive.org

Ajoutée le

Samedi 10 Février 2024

Dimensions

1000*743

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Albums

• Technology / Transport / Water

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327

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