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Fixed Dioptric light of the first order, vertical section

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Fixed Dioptric light of the first order, vertical section

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Summary

Illus. in: Plates Accompanying Report of the Secretary of the Treasury on the Improvements in the Lighthouse System and Collateral Aids to Navigation, detail of plate 4, (right).

On title page: Senate Document no. 488, 1st Session, 29th Congress, 1846.
On lower right: Lithy. by Ed. Weber & Co. Baltimore.

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Date

01/01/1846
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Source

Library of Congress
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