Parliamentary Papers

to be clear from the evidence, but Professor Dixon expressed his opinion that repeated groundings might have a cumulative effect in weakening one or more joints and ultimately bring about a collapse. His words on this point may be quoted :

Q. I would like to put this question to you. I am going to assume for the moment that there were a number of occasions at intervals when the suction did rest on the bottom. Assuming that did take place, do you think there might be a cumulative effect on the column or on any section of it?—A. I think it is possible there might be a gradual deterioration of the joint, owing to excessive strains put on some particular joint, due to the stalk touching the bottom. That would possibly cause a gradual deterioration of one joint; but I do not think I could prove it.

I think if a joint were broken, that joint would never make itself up again; I cannot see how it could, if a joint were broken. But when I said I thought there might be a gradual deterioration, it would be gradual until a joint broke. Once a joint broke, I do not think anything could save it.

VI. CONCLUSIONS.

I regret that I am not able to state definitely the cause of this accident, but I am clearly of opinion that the occurrence of a similar accident can be prevented.

In the system followed at Bilsthorpe and elsewhere, the pipes forming the rising main column are supported merely by standing one upon another, the clamps serving only to keep the column vertical. The failure of one pipe involves the collapse of the whole of the range above it. To obviate this, further support is necessary and in future it should be of such a character as to ensure that each pipe is separately and distinctly supported.

There are several ways in which this can be done, and I am quite certain that those in charge of sinkings will have no difficulty in finding that method which is best suited to their needs.

The provision of flexible suction pipes would also appear to be desirable.

I wish to thank all the representatives of the parties concerned in the Inquiry and to record my appreciation of their most helpful co-operation.

I have the honour to be, Sir,
Your obedient Servant,

H. WALKER,

H.M. Chief Inspector of Mines.

(278) Wt. 10177-3773 1000 9/27 H. St. G. 3