TUNNEL DRIVING.

Stratford Evening Post, Volume XXXII, Issue 99, 26 April 1912, Page 8

TUNNEL DRIVING.

A WORLD’S RECORD. Denver, Colorado.—A now world’? record lor tiinmd driving hy a pinole shift of inon working cigiit hours, a day has iioi'n made* in the coring ol the* Henrylyn irrigation tnnnol undai Jonas’ Pass, at flu* bond of War I. Clear Creole, duo west of Denver. The record—2:)”> feet of an S hy 10 font tunnel through solid granite,, in 2JI- days—lias been made hy a force of men in the employ of James A. Meflwoo, who a year ago established a world’s record for inline] driving‘in the Lr.ramie-Poiulre irrigation tunnel, after having previously cstahlislicd a similar record in the portal hare at the Roosevelt drainage tunnel at Cripple C-Voolr. The tunnel men on the TTonrvlvn

tunnel, which is designed to carry voter from the Williams none ol T-c Grande River on the western : i-un* into Clear Creek and thence nmi irrigation ditches in the Deary!; n dutrict, nor til and east oi Denver, ranged in to break the record on -mvember Ist. They hoped to mire J.U feet in thirty days. A round ol : , on; Fired at- 10 o’clock on a Wednesday morning, which, on account ol tin* absence of a ventilating -system in the tunnel at that time, left the bore full of gas and foul air, and a, holiday on Thursday prevented the driving of the 300 feet in thirty days. the driving of 293 feet in 291 days, however, still established a record for tunnel driving from one heading with a /.single shift of men. The best previous record for tunnel work' of this Kind was made in t>w Joker tunnel, on Rod Mountain, near Ouray. The record on tlie Lamarie.Poudrc tunnel, with three shifts wording from two portals, was Go-5 feet in 31 days, in granite similar to that under Jones’ Pass. Hie record oi 436 feet in 31 days in the Roosevelt drainage tunnel was made m Cripple Greek granite, the hardest granite in Colorado. The Henrylyn tunnel will measure 15,550 feet in length as against 11,725 feet, as provided for in the original plans.