By Ivor Evans
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Additional resources for The Strength, Fracture and Workability of Coal. A Monograph on Basic Work on Coal Winning Carried Out by the Mining Research Establishment, National Coal Board
Example text
5. E. and HOLLAND, C T . , W. Va. Univ. Engng. Exp. Sta. Res. , No. 17, 1937. 6. , / . Inst. Fuel, Vol. 9, 1935, p. 94. 7. , Proc. Conf. Ultrafine Structure of Coals and Cokes, British Coal Utilisation Research Association, London, 1944, p. 170. 8. , Vol. 25, 1948, p. 350. 9. , DIJKSTRA, H. , Fuel, London, Vol. 33, 1954, 10. 11. 12. 13. 14. p. 409. , Phil. Trans. A, Vol. 198, 1901, p. 147. , Engineering, London, Vol. 113, 1922, p. 684. POMEROY, C D . , Nature, London, Vol. 178, 1956, p. 279. POMEROY, C D .
13. The relationship between mean compressive strength and width for blocks of height 0-5 in. platens. Where friction is largely eliminated by means of lubrication the effect disappears, as was shown for coal in further experiments in which a series of flat slabs of Barnsley Hards 0-25 in. high, and of 0*25, 0-5,10 and 2-0 in. square cross-section were crushed. While the crushing stress of unlubricated specimens increased with size, that of graphite-lubricated speci mens remained independent of size.
Brit. J. appi. , Vol. 8, 1957, p. 270. , Rev. mod. , Vol. 18, 1946, p. 409. , Oliver & Boyd, Edinburgh, 1949, p. 36. 20. , Fuel, London, Vol. 34, 1955, p. 249. 21. HONDA, H. , Fuel, London, Vol. 35, 1956, p. 451. 22. A. and TERRY, N . B . , Fuel, Vol. 37, 1958, p. 201. CHAPTER 3 The Compressive Strength of Coal INTRODUCTION Coal is an engineering material in the sense that it has to be won from the seam by the application of mechanical forces. At a later stage of its journey from pit to consumer it may have to be broken to sizes that are appropriate to ease of transport or to particular methods of combustion, and again the application of external force is necessary.