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on outside of a made mast
, that give mast its circular form.
Longitudinal member going fore and aft parallel to centre girder.
It may be continuous
, in which
case floors are not continuous
; or it may be intercostal between continuous floors.
Two small keelsons lying on either side of main keelson to give increased longitudinal strength.
Rope ladder put over ship's side for manning or disembarking from boats.
Red and green screened lights compulsorily shown by vessels underway between sunrise and sunset.
Men detailed for upkeep and patching of ship's side paintwork.
or measured by
, the fixed stars.
Timepiece regulated to keep sidereal time. It gains 24 hours a year on a clock keeping mean solar time.
Interval between successive transits of First Point of Aries across a meridian. Is 3 minutes 55.91 seconds shorter than a mean solar day.
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