A man carrying a large bundle upon his shoulders, portraying a heavy burden.

Burden

A man carrying a large bundle upon his shoulders, portraying a heavy burden.

A man working in his office.

Man Working

A man working in his office.

Such a hammer will deliver a blow at every stroke of the piston-rod, and with sufficient air-pressure will give from 200 to 1,000 blows a minute

Pneumatic Hammer

Such a hammer will deliver a blow at every stroke of the piston-rod, and with sufficient air-pressure…