Square Set Timbering Virginia City Comstock Lode Nevada Mining 1870 2

This print is out of a very rare book, Report of the Geological Exploration of the Fortieth Parallel. Clarence King Geologist, Volume III, Mining Industry by James D. Hague. Government Printing Office 1870

Shaft Timbering. — The timbering consists of framed sets or cribs of square timber, placed horizontally, 4 feet apart, and separated by uprights or posts, introduced between them. Each horizontal set of timbers, therefore, marks about 5 feet in depth. Cross-timbers, for the partitions between the compartments, form a part of every set. The whole is covered on the outside by a lagging of 3-inch plank placed vertically. This method of timbering is illustrated by several drawings on Plates II and III. Fig. 1, Plate II, represents the plan of the shaft, or of one horizontal set of timbers ; S, S, arc the longitudinal or sill-timbers ; T, T, the transverse end-timbers ; P, partition-timbers ; r, guide-rods, between which the cage moves; g, gains, cut in the sill-timbers, to receive the ends of the posts. The sheathing or lagging is seen inclosing the whole frame.

Size of sheet is overall length 9" X 11 1/2" wide, image 6" X 8 1/2".

Condition: Crisp and clean. Once framed this map will be an excellent example of a historic print that is 150 years old.

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