| Description | Includes sections:
1) Diagrams showing dimensions of shoot to ship coal and correspondence, 1917-1929
2) Tender as to new tipping valve (Armstrong Whitworth and Co Ltd), 1915-1919
3) Quote for tipping valve for Boat Hoist No. 3, 1923
4) Extension to hopper platform following complaint from tipper that coal dust rises from hopper, 1937
5) Tender for cast steel tipping valve for hoist (with plan), 1938
6) Counterbalance valve for [Barge] hoist No. 3, 1947 |