| Description | Includes sections on:
1) Coal trimmer's lobby question papers, 1909-1911
2) Correspondence with work inspectors, 1910-1923
Tenders for new hydraulic accumulator and tipping valve for No. 5 boat hoist
1) Tannett Walker and Co Ltd, 1910
2) Armstrong Whitworth Co Ltd, 1910
3) Vickers Armstrong Ltd for tipping valve, 1937
Boat hoists Nos. 4 and 5 correspondence files includes:
1) Capstans and hydraulic mains which includes a small plan, 1909-1925
2) Sundry correspondence with works inspectors Boat Hoist No. 5, 1910-1950
3) Lobby for foreman and tippers, 1913-1924
4) Removal of boat hoist and includes correspondence with Inspector Barnard, 1922-1925
5) Removal of boat hoist, correspondence with W Armstrong Whitworth and Co Ltd, 1923-1926
6) Removal of boat hoist, correspondence with Inspector Bateman, 1923-1925
7) Removal of boat hoist, correspondence with Inspector Marland, 1923-1926
8) Removal of boat hoist, correspondence wtih Inspector Dinsdale, 1923-1925
9) Extract from engineer's report on capital works, 1922-1925
10) Stops for boat hoist, 1925
11) New counter-balance valve, 1928
12) New lifting valve for hoist, 1929-1936
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