Port Dinorwic, Caernarvonshire, Wales.

L/S of "the world's largest slate quarry", tilt down to show a steam train at the bottom of the pit. M/S of a man drilling a hole into the rock face. C/U of the man, he wears a hard hat. C/U of the drill boring into the rock. Low angle shot of the man drilling. Panning shot down the rock face to where two men are at work. M/S of the man taking the drill out of the rock face, another man enters and fills the hole with dynamite. C/U of the dynamite going into the hole, it is then plugged with paper. C/U of the fuse about to be lit. C/U of the man. C/U of the fuse catching light. M/S of three men walking to a shelter made from slate. L/S of the quarry, an explosion dislodges a large lump of slate. L/S of two men dislodging boulders from the rock face, tilt down as the slate falls into the quarry.

M/S of two men lifting a large lump of slate onto a cart. L/S of the quarry. M/S of a small train pulling carts stacked with slate. L/S of the "quarry's own railway system". Interior. M/S of two men inside the factory where the slate is trimmed "by hand and machine". M/S of a man using a circular saw to cut the slate. C/U of the spinning saw blade. M/S of a man sitting in the floor using a hammer and chisel to split slate in the traditional manner. C/U of the slate splitting into neat slabs. M/S of another man feeding slabs of slate into a trimming machine. C/U inside the machine as the splinters fall in. C/U of the trimming machine in action. M/S of the small train pulling carts stacked with neat slabs. C/U of the slabs in the cart, tilt up as train drives away from the factory.

Cuts exist - see separate record.