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
4/8/2019 11:48:08 AM
Credit: NOAA Office of NOAA Corps Operations
Subject: Charting
Subject: Soundings
Subject: Bathymetry
Subject: Mechanical