DICTIONARY OF

I Bar 177 Immersion
I
I Bar. Flat rolled steel section with small flat flange across longitudinal edges.
Ice. Water that has congealed due to lack of heat. Fresh water freezes at 0°C; salt water at
about —3°C. Eleven cubic feet of ice represent 10 cubic feet of water. Owing to heat
absorbed by melting ice, the meteorological aspect of ice is important.
Ice Anchor. Single fluke with shank. Put in hole or crack in ice for mooring purposes.
Ice Beam. Baulk of timber fitted to bow of ship, for fending off ice.
Iceberg. Great mass of floating ice that has broken off a glacier and been carried seaward.
Waterplane area may be more than five square miles; underwater depth up to 300 fathoms.
Movement may be with prevalent wind or current, but may be due to deep current. Generally
advisable to pass to windward of it.
Ice Blink. See 'Blink.'
Icebound. Said of a ship when she cannot move because of surrounding ice. Said of a port
when it is inaccessible because of ice.
Ice Breaker. Steam vessel with bow specially shaped to tread down and break sheet ice, and
make a navigable lane. 2. Sloping piles on upstream side of a pier to deflect or break up
floating ice.
Ice Clause. Inserted in marine contracts, when appropriate, to cover cases in which a ship or
port may be ice bound.
Ice Fender. 'Ice Beam.'
Icelandic Lows. Meteorological depressions that frequently form over Iceland.
Ice Lead. Navigable lane of water through ice.
Ice Master. One who takes charge of navigation of a whaler when ., in ice.
Ice Patrol. Ships and personnel employed in watching for ice, and derelicts, in North
Atlantic Ocean. Established by International Safety Convention, 1929. Maintained by
contributions of maritime nations interested.
Ice Report. Radio report, to shore stations and near-by ships, made by master of any vessel
sighting ice. Penalty for not reporting is £50.
Idler. Member of a crew who works all day but does not keep night watches; e.g. carpenter,
sailmaker. Termed 'dayman' in R.N.
'If Sufficient Water.' Clause inserted in a charter party to qualify the obligation to
discharge in a named dock, or berth, if there be not sufficient depth of water when the order
to berth is given.
Ignition Point. Minimum temperature at which a substance will ignite and burn. Is always
higher than 'Flash point'.
Ignition Temperature. Temperature to which a substance must be raised for it to burn.
Ikara. An anti-submarine missile delivering a homing torpedo.
Immersion. The sinking of a substance into a fluid.