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![Chronograph drum without paper theb1520.jpg Chronograph drum without paper](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1520.jpg?itok=e00eK-8b)
Description
Chronograph drum without paper.Used to record time ticks during longitude observations.Astro party of Charles Whitten (Image credit: C&GS; Season's Report Whitten 1935)
Credit
C&GS; Season's Report Whitten 1935
Display Date
1935
Location
Western United States
Collection
Historic Coast & Geodetic Survey
Geodesy
Astronomic Latitude and Longitude
Keywords
Geodesy
Astro