Browse Items (34 total)

Blue Mountain slate quarry near Slatington, seen looking east, showing the character of the syncline and the bending over southward of the cleavage at the surface, probably due to the friction and weight of the glacier

Eureka slate quarry near Slatington, north part seen looking east, showing an eroded northward-inclined close syncline crossed by cleavage and curved joints, and overlain by glacial deposits.

Slate quarry near Slatington, seen looking west, showing workmen engaged in clearing a "ribboned" slate from the surface of thick workable bed.

There are a couple of railroad boxcars in the photo, placed there for loading of roofing slates (most likely).

An early use of a core drill to check if it was worthwhile to open a quarry on a site. Before use of the drill came into operation, it was pretty often just educated guesswork where to site a new quarry.

Deckle-edge postcard