Hello Victator,See entry #81
These are hammock irons, rails, and netting. Two hundred years ago, the Constitution‘s sailors’ hammocks would have been stored in the open waist netting.
Picture courtesy Naval History & Heritage Command Detachment Boston. James Almeida, Naval Architect Technician
This is how the hommocks look back there...
You may be interested to check this link out. A wealth of information about Constitution
Home - USS Constitution Museum
ussconstitutionmuseum.org