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![A wooden triangulation tower within a tower cgs00356.jpg A wooden triangulation tower within a tower](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs00356.jpg?itok=oqj0Gb5A)
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https://www.noaa.gov/media/digital-library-photo/pl23cgs00356jpgDescription
A wooden triangulation tower within a tower. Inner tower was to support theinstrument while the outer tower supported the observer. (Image credit: Mr. Floyd Risvold, USC&GS; | Mr. Oscar Risvold)
Credit
Mr. Floyd Risvold, USC&GS;
Photographer
Mr. Oscar Risvold
Display Date
1923
Location
Alaska, Between Anchorage and Fairbanks
Collection
Historic Coast & Geodetic Survey
Geodesy
Oscar and Floyd Risvold
NOAA Affiliation
USC&GS;