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The single-acting air or steam hammer Fig.
7b
• The striking part, or ram, is raised by
air or steam pressure and then drops by
gravity.
Double-acting and differential air or steam
hammer Figure 7c
• The Air or steam is used both to raise
the ram and to push it downward,
thereby increasing the impact velocity of
the ram.
Figure 7 Pile-driving equipment: (a) drop hammer; (b) single-
acting air or steam hammer
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