In a quarry, this seam, unless a natural one, should be made by a channeling machine.
"Scientific American Supplement, No. 832, December 12, 1891" by Various
It was not much of a quarry, but it was a hole which would be refuge for reserves and machine guns.
"My Second Year of the War" by Frederick Palmer
On the left in a quarry beside the village of Marquion, I saw two Germans manning a machine-gun.
"The Great War As I Saw It" by Frederick George Scott
I came back from the chalk-quarry, where I had been busy all the morning with setting up the new machine.
"Hammer and Anvil" by Friedrich Spielhagen
Is there a machine shop, a mill, or a quarry?
"Text Books of Art Education, Book IV (of 7)" by Hugo B. Froehlich