No seguimento da resposta anterior.
Tenho bastantes dúvidas em relação a "mastro".
Sempre pensei que se chamasse "torre" ou "ponte"

--------------------------------------------------
Note added at 1 hr (2006-02-02 02:15:16 GMT)
--------------------------------------------------

No link acima, encontra uma imagem legendada(PT) do submarino.

Escolha errada!

Num submarino, a "sail" é a torre, onde estão instalados os mastros do periscópio e dos sistemas fotónicos.

Rising from the hull is a structure called the ***sail***. Known as the conning tower on older submarines, the ***sail*** of a modern, nuclear submarine houses periscopes, radar and radio masts, snorkel, and diving planes. During surface operation, the ***sail*** serves as the vessel's bridge. When submerged, the functions of the bridge are transferred to the control room, located in the pressure hull, directly below the ***sail***.

Ver em:
http://www.globalsecurity.org/military/systems/ship/ssn-774....
http://www.navsource.org/archives/08/08589.htm


--------------------------------------------------
Note added at 12 hrs (2006-02-02 13:20:49 GMT) Post-grading
--------------------------------------------------

http://foxxaero.homestead.com/indsub_01.html
http://www.ussvi.org/mem/state-fl.htm