The BLAKE anchored off WINDWARD Passage.George Belknap shipped Thomson piano wire machine to BLAKE in 1875Charles Sigsbee modified Thomson machine.Sigsbee sounding machine was the standard for many years
4/3/2019 10:36:26 AM
Credit: NOAA Office of NOAA Corps Operations
Subject: Charting
Subject: Soundings
Subject: Bathymetry
Subject: Mechanical
Subject: