HC Deb 07 June 1939 vol 348 cc420-1W
Mr. Dunn

asked the Secretary for Mines how many coal-cutters have been installed, how many conveyors have been installed, saying whether operated by electricity or compressed air, how many automatic picks are in use, how many shots have been fired, and the percentage of coal won by mechanical methods or

Yorkshire, 1925–1938.
Year. Number of Coal-cutting Machines in use driven by Number of Conveyors in use driven by Total number of Pneumatic Picks in use for all purposes. Number of Shots fired. Proportion of Coal won by Mechanical Methods.
Electricity. Compressed Air. Electricity. Compressed Air. By Coal-cutting Machines. By Pneumatic Picks alone.
Per cent. Per cent.
1925 … 297 624 208† Not available 4,322,841 16 Not available
1926 … 308 603 201† 2,248,594 17
1927 … 324 680 21 198† 4.763,301 17
1928 … 308 635 49 257 660 4,316,111 17 1.5
1929 … 297 629 100 283 885 4,606,324 18 2.6
1930 … 309 646 143 307 1,052 4,632,115 20 2.6
1931 … 313 673 142 305 1,093 4,521,971 24 2.4
1932 … 294 622 I44 299 1,065 4,479,712 26 2.2
1933 … 346 603 211 344 1,323 4.581,577 30 1.8
1934 … 375 637 287 431 1,668 5,465,245 38 1.5
1935 … 388 671 331 564 1,966 6,076,672 44 1.6
1936 … 398 619 408 583 2,372 6,623,177 47 2.1
1937 … 428 654 452 622 2,819 7,683,609 51 2.4
1938 … 465 632 549 687 3.038 8,007,067 56 2.4
*A certain proportion of coal won by this method is got by picks worked in conjunction with coal-cutting machines.
† In these years the particulars relate to conveyors in use at the coal face only.

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