Power source for hoisting steel.Jack up truck and use fifth wheel.This could be dangerous - at least one leg broken by getting wrapped up.Safety modifications made to system after individual severely injured.Triangulation party of Paul A. Smith
3/18/2019 2:24:53 PM
Date: 1931
Credit: C&GS; Season's Report Smith 1931
Subject: Geodesy
Subject: Triangulation
Subject: Towers
Subject: Bilby Steel