“Pitch cones” of hard asphalt at the edge of the lake
A near view of the surface of the lake. Gas emerging through surface water, as shown by ripples and bubbles
Uncovering land asphalt. The difference between lake and land asphalts can be seen readily
The narrow boardwalk, forty feet above the water, and the conveyor cable with loaded buckets of asphalt. Men throwing off the clutch.
The next step—Men releasing the pawl preparatory to emptying the large bucket.
