July 24, 1914. THE COLLIERY GUARDIAN. 213 Yorkshire. Revival of Doncaster Coal Exchange Project—Doncaster Infirmary—An Important Subsidence Case : A Conse- quence of Heavy Pumping. The likelihood of the establishment of a coal exchange for Doncaster is again being mentioned. Enquiry shows that the idea has by no means been lost sight of, and that it is merely a matter of time. To establish a successful coal exchange, it is pointed out that railway companies, coal exporters, and all interested, have to be in the same frame of mind, and that the next thing to do is to select a suitable day for the transaction of business, so as not to clash with existing coal exchanges in the West Riding. Wednesday is spoken of as the most suitable day for the projected Doncaster exchange. Those interested in the project told our correspondent that it was hoped the Doncaster exchange would be established and in full swing by next spring. A meeting of gentlemen interested—colliery representatives, coal exporters, and railway officials—will shortly be held to discuss the matter. As a number of the collieries at present use the Danum Hotel for their monthly meetings, there is felt to be not much doubt but that in time this place will become the head quarters of the exchange. This is the season of the Hospital Sunday demonstrations. In the speeches made in the Doncaster list, repeated refer- ence is found to the obsolete character of the present Don- caster Infirmary, and to the absolute need, in view of the collieries around, of a newT institution. Speaking at the Carcroft Miners’ Demonstration last Sunday, Mr. Albert Guest, who is an official at Bullcroft Colliery, said they never knew what might suddenly come about in a great colliery district such as Doncaster had become, and what were they going to do with only 65 beds in the infirmary. The men at Bullcroft had decided to make four collections a year, which would raise 1-200, but half of this they were sending to Leeds Hospital, which they preferred to Doncas- ter, as it was better equipped. Cottage hospitals were a mistake, except in places which were a long distance from a main hospital. The fund for the erection of a mission church at Moor- thorpe, in connection with the South Kirkby Parish Church, has received a gift of £800 from the Carlton Main Colliery Company, who have also given a site. A case associated with the Doncaster district, but one of general interest to colliery proprietors throughout the coun- try, was decided at the West Riding Assizes last Saturday. The Askern Coal and Iron Company Limited, Askern, Doncaster, were sued by Mr. Alfred Stubbs, of Lake View, Askern, for damages caused by subsidence.—Plaintiff had two houses near Askern Pool, and alleged that the pump- ing operations incidental to the sinking of Askern Colliery, established a stream from Askern* Pool under his property, and so brought about the subsidence. It would cost about £300 to repair the houses.—Evidence having been given to this effect, remarkably interesting scientific testimony of great import to those concerned in the South Yorks coal- field, was forthcoming from Mr. P. E. Kendall, Professor of Geology to the University of Leeds. He stated fie had had 20 years’ experience of subsidences due to colliery workings, and was well acquainted with the Askern area, which he had visited for geological study. Eor colliery purposes he recently made a re-survey of a very large area to the west of Askern, and of Askern itself. In the course of this he discovered that the Government maps were very seriously in error, and he had submitted a private report correcting the areas as being very material to colliery workings In regard to the geological succession of the dis- trict, he stated that around the Askern pit, as he feared the Askern Colliery Company would find to their cost, the country was excessively faulty. He had found four faults in open section to the north of the nit, and upon the south side there was an enormous fault, which was one of the largest in the district. Having regard to the extremely shattered nature of the country, it was highly probable that there were faults between the pit and the lake. A discharge from the pit of 3,500 gals, of water per minute meant an enormous discharge, and in his opinion the cause of the subsidence under the property was the withdrawal of silty material in consequence of the flow of water drawn from the pool, and the surrounding strata. Mr. Stanley Robert Kay, of the firm of Mammatt, White and Kay, who advised the plaintiff, said the buildings were founded upon a concrete raft 18 in. in thickness, extending under the whole of the buildings, resting upon a foundation of silt and alluvial deposit. The gable end was further pro- tected by being built upon a row of piles which were driven down to firm ground at a depth of about 16 ft. He had had the ground taken out at the south-eastern corner of the property for the purpose of an inspection, and found the piles sound and intact. The concrete, however, was 3 in. out of level, and had subsided to that extent. This con- crete could not have subsided from any other cause than a loss of support, which could only have been brought about bv an actual abstraction of solid matter. He could conceive of such damage being the result of mere shrinkage due to the abstraction of water from the silt. As a matter of fact the silt was saturated with water at the time of the damage as water from the pool had not ceased to flow to the pumps. During the summer of 1911 large pumps were installed nt the Askern sinking, and 5,000 gals, per minute were pumped dav and night for a considerable portion of the period between August 11. 1911, and the latter part of January 1912. By the middle of August Askern Pool was nearly drained away, and naturally the surface water in the pool would flow to the pumps in the sinking pit. The water began to come back to the pool when- ever pumping operations were suspended owing to breakdown in October, and when pumping was finally dis- continued the water gradually resumed its level in the nool. In witness’s opinion the flow of water from the pool to the numns took with it solid matter in suspension, as a considerable quantity of solid matter was pumped out with the water. The presence of springs in the pool n^ar to plaintiff’s nronertv was an indication that considerable faults or breaks in the strata existed in the neighbourhood, and these would tend to create a quick flow of the water to the numns owin