previous next

Screw-dock.


Hydraulic Engineering.) A contrivance for lifting a vessel out of the water, in order that the bottom may be examined and cleaned.

The vessel to be raised by this apparatus is floated over a platform of wood, sunk to the depth of about 10 feet below the surface of the water, and suspended from a strongly built wooden framework by iron screws from 4 1/2 to 5 inches in diameter. This platform has several shores on its surface, which are brought to bear equally on the vessel's bottom, to prevent her from heeling over on being raised out of the water. The platform is gradually raised to the surface of the water, carrying the vessel high and dry, suspended between the wooden frames.

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 United States License.

An XML version of this text is available for download, with the additional restriction that you offer Perseus any modifications you make. Perseus provides credit for all accepted changes, storing new additions in a versioning system.

hide Places (automatically extracted)

View a map of the most frequently mentioned places in this document.

Download Pleiades ancient places geospacial dataset for this text.

hide Display Preferences
Greek Display:
Arabic Display:
View by Default:
Browse Bar: