HC Deb 10 March 1930 vol 236 c935W
Mr. LEES

asked the Secretary for Mines what proportion of coal was out by machinery in Yorkshire and Derbyshire, respectively, in 1913, 1925, 1927, 1928, and 1929?

Mr. TURNER

The figures are as follow:

Proportion of Coal cut by Machinery.
Yorkshire. Derbyshire.
Per cent. Per cent.
1913 … 10.3 10.7
1925 … 15.6 19.4
1927 … 16.8 22.7
1928 … 17.5 28.4
1929 (provisional) … 17.9 31.4