Bilby 116-foot portable steel tower used in triangulation

Bilby 116-foot portable steel tower used in triangulation. These towers are built by 5 men in approximately 6 hours. Preparations are being made for dismantling this tower in this image.

Photo Date: 1933 ca.

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Author: NOAA Central Library Historical Imagery/ NOAA

License: Public Domain Mark 1.0 (Public domain)

Small	415 x 640	33.75 KB
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Original	1821 x 2815	553.86 KB

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Added On	16th October 2015
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