The Civil engineer and architect's journal, scientific and railway gazette . .. 10 10 0 Fore and concave and skimming plates .* Contingencies .* .. •• Making a total of 107 6 8 To this must be added, about HI. for the masons labour, and 21. for that ofthe smiths, which, added to the cost of the furnace, 107/. 6s. 8</., will makea total cost of 123/. 6s. Sd. The prices given are those of the period whenthe furnace was constructed;—of course, at different times they will vary con-siderably ; any one, however, will be able from them to calculate what thepresent outlay would amount to. By build
The Civil engineer and architect's journal, scientific and railway gazette . .. 10 10 0 Fore and concave and skimming plates .* Contingencies .* .. •• Making a total of 107 6 8 To this must be added, about HI. for the masons labour, and 21. for that ofthe smiths, which, added to the cost of the furnace, 107/. 6s. 8</., will makea total cost of 123/. 6s. Sd. The prices given are those of the period whenthe furnace was constructed;—of course, at different times they will vary con-siderably ; any one, however, will be able from them to calculate what thepresent outlay would amount to. By building two furnaces, with a doublestack to serve both, and using clay in the sides, instead of bricks, a lessconsumption of materials would take place, which would necessarily be fol-lowed by a commensurate reduction in the expenditure, thereby enablingthe contractor to construct his furnaces on a more economical principle thanabove detailed. 7 0 02 0 0 1848.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 311 ATMOSPHERIC PILE-DRIVING by Clarke and STide Elevation of a Single Machine. This apparatus has been lately used for driving the piles of thecoflFerdam for Irongate, St. Katherines Docks. The inventorsstate that by this machine, piles may be driven at half the expenseof driving tJiem by the ordinary machine worked by hand, and inabout one-sixth of the time. Mr. Crate, the clerk of the worksat the above docks, states that he drove forty-two piles, 18 feetdeep, into a bed of very hard compact gravel, at the rate of threepiles each tide of about 3k hours; and to drive one pile only, bythe ordinary hand-engine, occupied five tides before it could befinished, and even then was left 2 feet above the height requiredto be driven. Mr. Harrison, the engineer, also certifies that theAtmospheric Pile-Driver gave him entire satisfaction. This machine consists of a vacuum cylinder of wrought-iron(A), closed at the bottom and open at the top, having an air-tightp
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