 | Edward Spon, Oliver Byrne, Ernest Spon, Francis N. Spon - 1874 - 396 páginas
...together for lowering them down the well to recover the broken portion ; and by this means the ends of the rods were prevented from becoming unscrewed...the joints in the broken length at the bottom of the bore-hele. M Dru states that in his own experience, owing to the difficulties attending the operation,... | |
 | Ernest Spon - 1875 - 320 páginas
...power, yet, as Dru himself observes, " in some instances his own experience of boring had been, that owing to the difficulties attending the operation,...rule, while the regular working of the machinery was the exception." A further disadvantage to be noticed is that, owing to the time and labour involved... | |
 | 1902 - 1054 páginas
...Urn method of boring by rods worked by steam power, yet, as Dru himself observes, in some instances, "owing to the difficulties attending the operation, the occurrence of delays from accidents is the rule, while the regular working of the machinery is the exception." In the Mather and Platt... | |
 | Ernest Spon - 1885 - 322 páginas
...by this means the ends of the rods were prevented from becoming unscrewed in the coupling sockets, when the rods were turned round backwards for unscrewing...the joints in the broken length at the bottom of the bore -hole. When running sands are met with, the plan adopted is to use the Chinese ball-scoop, or... | |
 | C. Isler - 1902 - 250 páginas
...together for lowering them down the well to recover the broken portion ; and by this means the ends of the rods were prevented from becoming unscrewed...the broken length at the bottom of the bore-hole. When running sands are met with, the plan adopted is to use the Chinese ball-scoop or shell, Fig. 52... | |
 | C. Isler - 1902 - 254 páginas
...together for lowering them down the well to recover the broken portion ; and by this means the ends of the rods were prevented from becoming unscrewed...the broken length at the bottom of the bore-hole. When running sands are met with, the plan adopted is to use the Chinese ball-scoop or shell, Fig. 52... | |
 | Institution of Mechanical Engineers (Great Britain) - 1869 - 524 páginas
...read at the Paris meeting observed, " in some instances his own experience of boring had been, that owing to the difficulties attending the operation,...rule, while the regular working of the machinery was the exception." A further disadvantage to be noticed is that, owing to the time and labour involved... | |
 | Institution of Mechanical Engineers (Great Britain) - 1867 - 1066 páginas
...by this means the ends of the rods were prevented from becoming unscrewed in the coupling sockets, when the rods were turned round backwards for unscrewing...the broken length at the bottom of the bore-hole. Mr. J. LANCASTER enquired what was the average cost of boring any of the ordinary bore-holes in the... | |
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In that case, a locking-clip was added at each screwed joint above, and secured by bolts, at the time of putting the rods together for lowering them down the well to recover the broken portion ; and by this means the ends of the rods were prevented from... 