Rock Drilling With Particular Reference to Open Cut Excavation And Submarine Ro

Cover Rock Drilling With Particular Reference to Open Cut Excavation And Submarine Ro
Rock Drilling With Particular Reference to Open Cut Excavation And Submarine Ro
Richard T Dana
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When one hole is thus shot, the rest are thereby set off. After a large blast the boat is sometimes drawn back into position by a tug.
Interest and depreciation on the plant valued at $20, 000 at 2% per working month = $8 per shift.
Moving the boat from range to range usually requires 3. 6% of 214 ROCK DRILLING the observed time, on which basis the cost per day shift would be $1. 28 = $0. 43 per drill per shift.
A rough inventory of the equipment of this boat follows : One boat, 67^X25 J'.
Two
...spud anchors.
Two spud engines 6' V X8".
One blower.
One small 4"X6" engine for blower.
Three drills and outfits.
Eleven bits.
One forge.
One bench.
One pipe clamp.
One anvil.
One small dynamo and engine.
One boiler 9'X6', Scotch marine.
One hydraulic cylinder, 10' long.
One force pump, Worthington, 12X5^X10".
One powder boat.
One cutter.
The only obtainable record of performance on the " Dynamiter " was for one shift per day of n hours, the total covering a period of one week. It is as follows : Date.


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