A pressure method of cleaning loose material out of an open-ended cased pile, caisson or cofferdam cell. Usually compressed air is introduced into the water at the bottom of the casing via a small pipe inside a larger pipe. Air is directed upward out of the larger pipe; this upward flow tends to lift material in the pile.
A small hand-held dredge that works like a vacuum cleaner, used to clear away the sand on the seabed.
an item of diving equipment, based on apipe, used in nautical archaeology to suck small objects,sand and mud from the sea bed and totransport the resulting debris upwards and away from its source
a sumberged water pump, it operates on air injected from a linear air pump
A wide tube is lowered to the excavation site. Into the lower end of the tube compressed air is pumped from the surface. The air bubbles up and creates a suction. This pulls up water, sand, and small objects. All of this can be sifted on deck. Photo at right by Mary Rose Trust. Detail photo.
Instrument like a giant vacuum cleaner used by underwater archaeologists to remove dirt and debris from underwater archaeological sites.
An Airlift is device based on a pipe, used in nautical archaeology to suck small objects, sand and mud from the sea bed and to transport the resulting debris upwards and away from its source. It is sometimes called a suction dredge. A water dredge or water eductor may be used for the same purpose.