They revolutionized the lumber industry.

While Captain Pray had long used a steam tug to raft logs across Lake Tahoe, the lumber itself was hauled down to Carson and Virginia City.

Now, owning large areas of timberland, operating two and then three saw-mills in Glenbrook, and several others in the nearby mountains, Messrs.

Yerington & Bliss sought easier means of transportation for their merchandisable product.

They constructed dams and reservoirs, with V flumes in a number of places, making them converge as near as possible at the Summit, some six miles from Glenbrook.