The first picture of a Bilby portable steel tower under construction. Bilby towers were made of prefabricated steel parts that could be reused. These towers were designed by Jasper Bilby, chief signalman of the C&GS
Photo Category: Geodesy - Triangulation - Towers - Bilby Steel
Photo Location: Minnesota
Photo Date: 1927
| Added On | 18th October 2015 |
| Viewed | 10 viewed |