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This crude instrument was used in an attempt to work out problems in latitude. After holding one end of the staff to the eye and sliding the cross staff along until the observer sighted over one end at the sun and under the other at the horizon, the instrument was placed on a circle marked in degrees, and the angle was determined.

Author

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

Posted on

Saturday 10 February 2024

Dimensions

1000*813

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Albums

• Technology / Transport / Water

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252

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