pl23_theb4090.jpg
![Field's protractor and parallel ruler in use on a chart, plotting bearing of alighthouse theb4090.jpg Field's protractor and parallel ruler in use on a chart, plotting bearing of alighthouse](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb4090.jpg)
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https://www.noaa.gov/media/digital-library-photo/pl23theb4090jpg-0Description
Field's protractor and parallel ruler in use on a chart, plotting bearing of alighthouse. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons,
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Historic Coast & Geodetic Survey