Title page to manual - "The Submarine Fathometer".
Fathometer invented by Herbert Grove Dorsey of the Sub Signal Corporation.
Image ID: theb2148, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
| NOAA Disclaimer
June 10, 2016