General view of excavation works. One man can be seen in the centre of the image above the track by a ladder. Image is annotated "Works on left bank of river looking upstream 3-9-59" Stamped on reverse "Richards Bros Penzance"
Close-up image of the valve tower construction. The circular valve can be seen centre right. Two men standing on scaffolding poles and more seen above. It is annotated "Valve tower foundation. Concrete etc 3-9-59" Stamped on reverse "Richards Bros…
View along channel towards the McAlpine works on left. Several men building a scaffolding bridge across the channel.
The image is annotated "Downstream diversion channel 3-9-59"
Close-up image of digging the monolith for the dam. Four men can be seen in the trench to the left of the tall ladder digging with hand tools. It is annotated "Foundation for monolith 3-9-59"
Stamped on reverse "Richard Bros Penzance"
Image showing general view of the excavation works for Drift Dam. There are a few men standing in the middle of the photograph. It is annotated "Works on right bank of river looking upstream 3-9-59"
Stamped on reverse "Richards Bros Penzance"
Image showing shuttering for concrete and ladders.
It is annotated "Excavation & Concrete left bank of river 3-9-59"
Stamped on reverse "Richards Bros Penzance"