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" ... per lineal foot, varying with the cost of labor and the character of the rock to be excavated. The end of the tunnel is designed to be from fifty to one hundred feet, or perhaps more, beneath the bottom of the gravel, at a point where a shaft or incline... "
The Natural Wealth of California: Comprising Early History; Geography ... - Stran 544
avtor: Titus Fey Cronise - 1868 - 696 strani
Celotni ogled - O knjigi

The Natural Wealth Of California

Titus Fey Cronise - 1868
...only after many abortive trials and much experience. This problem involves the following cpnditions : 1st. The whole mass of auriferous gravel must be removed,...magnitude with the accuracy required, and for the want of suflicient care or skill in this particular, years of costly labor and anxious expectation were sometimes...
Celotni ogled - O knjigi

The Natural Wealth of California: Comprising Early History; Geography ...

Titus Fey Cronise - 1868 - 696 strani
...disintegration of the compact conglomerate as a part of the uninterrupted operation of the whole system. 4Ah. The simultaneous saving of gold without interrupting...avenue for reaching the auriferous deposits, but also a sluice-way, through the whole length of which sluice boxes are laid, both to direct the stream and...
Celotni ogled - O knjigi

The Natural Wealth of California

TItus Fey Cronise - 1868
...are usually six to eight feet in width by seven feet in height, the length varying from a few Imndred feet to a mile. For driving some of the longer of...avenue for reaching the auriferous deposits, but also a sluice-way, through the whole length of which sluice boxes are laid, both to direct the stream and...
Celotni ogled - O knjigi

The Natural Wealth of California: Comprising Early History; Geography ...

Titus Fey Cronise - 1868 - 696 strani
...of these works from five to seven years have been required, at a cost of from ten to sixty dollai's per lineal foot, varying with the cost of labor and...avenue for reaching the auriferous deposits, but also a sluice-way, through the whole length of which sluice boxes are laid, both to direct the stream and...
Celotni ogled - O knjigi

Silverland, by the author of 'Guy Livingstone'.

George Alfred Lawrence - 1873
...channel, at a point where a shaft or incline is sunk through the gravel until it intersects the tunnel. It obviously demands careful engineering to carry...care or skill in this particular, years of costly labour and anxious expectation were wasted in the early history of these enterprises. The object of...
Celotni ogled - O knjigi

Silverland

George Alfred Lawrence - 1873 - 259 strani
...channel, at a point where a shaft or incline is sunk through the gravel until it intersects the tunnel. It obviously demands careful engineering to carry...care or skill in this particular, years of costly labour and anxious expectation were wasted in the early history of these enterprises. The object of...
Celotni ogled - O knjigi

Statistics of Mines and Mining in the States and Territories ..., Količina 6

United States. Department of the Treasury - 1874
...channel, at a point where a shaft or incline is sunk through the gravel until it intersects the tunnel. It obviously demands careful engineering to carry...required, and, for the want of sufficient care or skill iu this particular, years of costly labor and anxious expectation have been wasted in the early history...
Celotni ogled - O knjigi

House Documents, Otherwise Publ. as Executive Documents: 13th ..., Količina 10

United States. Congress. House - 1874
...I. at a point where a shaft or incline is sunk through the gravel until it intersects tho • mnel. It obviously demands careful engineering to carry...accuracy required, and, for the want of sufficient caro or skill in this particular, years of costly labor and anxious expectation have been wasted in...
Celotni ogled - O knjigi

The American Journal of Science and Arts

1865
...at a point where a shaft is sunk through the gravel and 'bed rock' until it intersects the tunnel. It obviously demands careful engineering to carry...costly labor and anxious expectation were sometimes wasted in the early history of these enterprises. The object of this laborious exploration is obvious....
Celotni ogled - O knjigi




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