drop-hammer

For this purpose, a drop-hammer, constructed to meet the following requirements, is used: A substantial, unyielding foundation; minimum friction in the guide-grooves; and no escape or scattering of the explosive when struck by the falling weight.

Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 Herbert M. Wilson

He turns it over, brings the drop-hammer down again, once, twice, and the piece is shaped.

The Boy With the U.S. Census Francis Rolt-Wheeler 1918

Watch him now, "he went on, following the action of the workman;" he takes a piece of steel out of the furnace behind him, lays it on the die, touches a lever, and the big drop-hammer comes down, -- once, twice.

The Boy With the U.S. Census Francis Rolt-Wheeler 1918

It has rough edges all round, of course, and so he takes it, while it is still glowing red, to a more exact die, and brings the drop-hammer down once, and turns it over, then brings down the hammer again once.

The Boy With the U.S. Census Francis Rolt-Wheeler 1918

Hamilton found it hard to tear himself away, for while the principle was the same, all the different forges were turning out different parts, and it was a fascination to the boy to see those glowing lumps of steel come out of the furnace and with the few strokes of the drop-hammer, fall a few seconds later, the shaped part of a rifle.

The Boy With the U.S. Census Francis Rolt-Wheeler 1918

Fig. 102, is a typical installation that shows the main features for application to a forging machine or drop-hammer, oil-burning furnace, or for an arched-over, coal furnace where the flame blows out the front.

The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel 1916

Water-cooled, tuyere openings, as mentioned above, which support brick side-walls of the furnace, have proved successful for coal furnaces used for forging machine and drop-hammer heating, since they permit a great amount of work to be handled through their openings without wearing away as would a brick arch.

The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel 1916