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PORTHOLE
Unique ID: MAS-F100108
Object type certainty: Certain
Workflow
status: Published 
This object is the remains of a brass porthole ring measuring 250 mm across with a brass rim 28 mm wide. It is thought that this frame would have been on the outside of the hull of the vessel while an internal frame on the inside of the vessel would have contained the glass element and a hinged deadlight (a metal plate that was both a curtain and a reinforcement against heavy seas).
Portholes have been used for centuries to allow light and ventilation to enter the lower, darker levels of vessels and in some early cases, as a means of seeing out of a submersible. Portholes are watertight and are generally crafted from glass, secured within a metal frame that is then bolted to the vessel. The popular metals that are used to create the frame of the portholes are bronze and brass because these metals corrode less in saltwater.
Class:
Fixtures and Fittings
Sub class: Porthole
Subsequent actions
Current location of find: With finder
Subsequent action after recording: Submitted as wreck to the Receiver of Wreck
Wreck details
Droit number: 225/17
Chronology
Broad period: MODERN
Period from: MODERN
Period to: MODERN
Dimensions and weight
Quantity: 1
Width: 28 mm
Thickness: 3 mm
Diameter: 250 mm
Discovery dates
Date(s) of discovery: Wednesday 23rd August 2017
Personal details
Found by: This information is restricted for your login.
Recorded by: A BB
Identified by: Richard Endsor
Secondary identifier: V L
Other reference numbers
Droit ID: 225/17
Materials and construction
Spatial coordinates
4 Figure: TQ4400
Four figure Latitude: 50.78170298
Four figure longitude: 0.04126088
1:25K map: TQ4400
1:10K map: TQ40SW
Display four figure position on What3Words
Unmasked grid reference accurate to a 1 metre square.
References cited
No references cited so far.
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