Mechanisation in the Bristol District
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No of pits at work |
No of cleaning plants | % of saleable output cleaned | Electrical equipment | Cutting machines | Conveyors and loaders | Pits using horses & ponies | No of horses & ponies | No of safety lamps in use | ||||||||||
| Pits using electrical equipment | Horse- power in use | No of pits using machines | Machines in use | Tons of coal cut | % of total output | No of pits using machines | Machines in use | Tons of coal conveyed | % of total output | Flame | Electric | Total | |||||||
| Conveyors | Loaders | ||||||||||||||||||
| 1910 | Combined with Forest of Dean - separate figures not given | ||||||||||||||||||
| 1911 | Combined with Forest of Dean - separate figures not given | ||||||||||||||||||
| 1912 | Combined with Forest of Dean - separate figures not given | ||||||||||||||||||
| 1913 | Combined with Forest of Dean - separate figures not given | ||||||||||||||||||
| 1914 | Combined with Forest of Dean - separate figures not given | ||||||||||||||||||
| 1915 | |||||||||||||||||||
| 1916 | |||||||||||||||||||
| 1917 | |||||||||||||||||||
| 1918 | |||||||||||||||||||
| 1919 | |||||||||||||||||||
| 1920 | |||||||||||||||||||
| 1921 | 5 | 4 | 1 | 90 | 560 | 22 | 582 | ||||||||||||
| 1922 | 5 | 4 | 1 | 84 | 748 | 34 | 782 | ||||||||||||
| 1923 | 5 | 4 | 1 | 84 | 989 | 68 | 1,057 | ||||||||||||
| 1924 | 5 | 4 | 1 |
78 | 1,008 | 50 | 1,058 | ||||||||||||
| 1925 | 5 | 3 | 1 | 4 | 51 | 572 | 159 | 731 | |||||||||||
| 1926 | 4 | 3 | 1 | 3 | 49 | 316 | 379 | 695 | |||||||||||
| 1927 | 3 | 1 | 15.3 | 2 | 1 | 3 | 48 | 36 | 370 | 406 | |||||||||
| 1928 | 3 | 1 | 16.9 | 2 | 1 | 3 | 48 | 36 | 373 | 409 | |||||||||
| 1929 | 3 | 1 | 16.2 | 2 | 1 | 3 | 47 | 36 | 374 | 410 | |||||||||
| 1930 | 3 | 1 | 14.7 | 2 | 1 | 4 | 17,227 | 9 | 0 | 0 | 0 | 0 | 0 | 3 | 48 | 36 | 377 | 413 | |
| 1931 | 3 | 2 | 22.3 | 3 | 1 | 4 | 10,919 | 7 | 0 | 0 | 0 | 0 | 0 | 3 | 42 | 36 | 370 | 406 | |
| 1932 | 3 | 2 | 23.3 | 3 | 1 | 4 | 16,878 | 10 | 0 | 0 | 0 | 0 | 0 | 3 | 45 | 36 | 336 | 372 | |
| 1933 | 3 | 2 | 26.7 | 3 | 3 | 8 | 29,367 | 18 | 1 | 1 | 0 | 7,520 | 5 | 3 | 41 | 36 | 324 | 360 | |
| 1934 | 3 | 2 | 31.9 | 3 | 3 | 7 | 42,348 | 24 | 1 | 1 | 0 | 6,664 | 4 | 3 | 43 | 20 | 269 | 289 | |
| 1935 | 3 | 2 | 35.7 | 3 | 3 | 7 | 32,198 | 19 | 1 | 1 | 0 | 3,266 | 2 | 2 | 35 | 13 | 276 | 289 | |
| 1936 | 3 | 1 | 35.7 | 3 | 2 | 2 | 23,402 | 25 | 1 | 1 | 0 | 10,641 | 11 | 1 | 30 | 18 | 278 | 296 | |
| 1937 | 1 | 1 | 47.4 | 1 | 1 | 2 | 23,854 | 35 | 1 | 2 | 0 | 23,854 | 35 | 1 | 28 | 0 | 0 | 0 | |
| 1938 | 1 | 1 | 58.3 | 1 | 1 | 2 | 19,884 | 29 | 1 | 2 | 0 | 19,884 | 29 | 1 | 28 | 0 | 0 | 0 | |
| 1939 | 1 | 1 | 2 | 12,155 | 19 | 1 | 2 | 0 | 1,559 | 2 | 0 | ||||||||
| 1940 | 1 | 1 | 4 | 15,992 | 27 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
| 1941 | 1 | 1 | 4 | 17,037 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
| 1942 | 1 | 1 | 4 | 13,153 | 20 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
| 1943 | 1 | 1 | 4 | 5,099 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
| 1944 | 1 | 1 | 1 | 4,211 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||