Construction workers on the Nidd Valley Dam site.
SLATE INFORMATION: A Big Job: Building Bradford's great dam in the Nidd Valley. It is a part of the water supply scheme and will employ 1000 men for 15 years.
Workers on dam construction site laying sections of huge pipe
Trucks of rubble along on railway track
Men pack explosives into rock, then sound warning on horn as dynamite explosion blows up rock face
Men with pick-axes chip at rock as excavating machine gathers rubble
Background: Construction workers on the Nidd Valley Dam site.