hide Matching Documents

The documents where this entity occurs most often are shown below. Click on a document to open it.

Document Max. Freq Min. Freq
Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
View all matching documents...

Your search returned 1 result in 1 document section:

Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
structions in Hellgate amounted to from $1,500,000 to $2,000,000 a year. In 1868, an appropriation of $85,000 was made for their removal. Proposals for undertaking the work varied from $38,000 to $500,000, showing, notwithstanding the elaborate surveys previously made, that the bidders were entirely ignorant of what amount of work the requirements to be fulfilled might ultimately necessitate. Submarine blasting. Vertical section of excavation at Hallett's point, New York. Mr. S. F. Shelburne of New York, being the lowest bidder, received the contract. He employed first a small diamond-drill, rotated by a turbine; but this proving ineffectual, a larger one, the Mushroom. of similar construction, was substituted. Drills of this construction were, however, found inadequate to do the work in such an exposed locality; and finally a powerful striking-drill was employed with fair prospects of success, but was, however, unfortunately run down by vessels and destroyed before i