Evening Republican, Volume 19, Number 247, Rensselaer, Jasper County, 18 October 1915 — ALL BUILT OF TIMBER [ARTICLE+ILLUSTRATION]

ALL BUILT OF TIMBER

WOODEN CANTILEVER USED IN CONSTRUCTION OF VIADUCT. ■ W Notable Example of Modern Engineer* i Ing Method#—Derrick Booma Stretched More Than One Hundred Feet Ahead of Finished Work. In constructing a railroad viaduct at Lewiston, Mont,, a wooden cantilever traveler which was used for handling the steelwork offers an interesting example of modern engineering methods. Except for the supporting guy rods, reaching from the center tower to the outer end of the long overhang, the traveler was built entirely of timber. The heavy horizontal beams were about twenty feet above the track, and, with the two derrick booms which they supported at their outer ends, commanded a reach of approximately one hundred and ten feet in advance of the finished work. These beams extended about the same distance to the rear that they did forward and held a platform on which the hoisting

engines were carried. This provided the traveler with an adequate counterweight. The material was delivered in cars at the end of the track, carried throgh the lower part of the traveler and swung out, as may be seen in the accompanying photograph. In this manner the booms were used in building up the bridge towers and putting the short girders in place. The connecting members were swung into position by tackles attached to the overhang structure. —Popular Mechanics.

The Wooden Cantilever Traveler in Use Beginning the Erection of the Viaduct at Lewiston, Mont.