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Creative (RM)
#141862866
Peterborough Lift Lock, Trent-Severn Waterway, Ontario, Canada. The image shows the two caissons filled with water that are used to raise and lower boats 19.8 meters (65 feet). The caisson, or lock chamber, on the leftraised to its top level by a ram, or
Por: Louise Heusinkveld
Oxford Scientific