Boston Public Library
Exhibitions

Atlantic Neptune Part 1 – Item 21 of 23

parallelrule
Parellel Rule, 19th century. Ebony and brass.
Courtesy USS Constitution Museum. USSCM Cat. #295.1
The parallel rule is used to draw parallel lines, which is important in laying off a specific course on a chart. Parallel rules are still used by navigators today.

 

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