Lantern Slides

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Old works, Morelands and Beam engine houses at Hampton

Opening ceremony at Chingford

Opening ceremony at Littleton storage reservoir

Opening into Garden Well

Opening of Honor Oak works

Original intake at Barnes No. 1 reservoir

Ornamental pond at New River Head

Orpington pumping station

Orpington Pumping Station exterior

Orpington well level & yield 1920 - 1935

Oscillaria

Out county districts draining to London

Outlet & chlorination house at Littleton

Outlet at queen Mary Reservoir

Outlet of Aqueduct

Outlet tower and bridge at Littleton

Outlet tower for forebay at Littleton

Overmantle at New River Head

Pangbourne from Shooters Hill

Partially reconstructed Sheffield engines

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