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Eng ID Term Definition
2901
local meridian
See MERIDIAN.
2902
local sidereal time
See TIME.
2903
local time
See TIME.
2904
local transit
See TRANSIT.
2905
local warning
A NAVIGATIONAL WARNING which covers inshore waters, often within the limits of jurisdiction of a harbour or port authority.
2906
loch
The Scottish term for (1) a LAKE, and (2) a FIORD.
2907
lock
A WET DOCK in a WATERWAY, permitting a ship to pass from one level to another. See TIDE LOCK.
2908
lock gate(s)
Pair of massive hinged doors at each end of a LOCK.
2909
locking
In ELECTRONIC NAVIGATION, a term describing the condition of two TRANS­MITTERS when their SIGNALS maintain a stable phase relationship. One ... more
In ELECTRONIC NAVIGATION, a term describing the condition of two TRANS­MITTERS when their SIGNALS maintain a stable phase relationship. One STATION is then said to be locked to the other.
2910
locus
(pl. loci). All possible positions of a point or curve satisfying stated conditions.
2911
log
An instrument for measuring the SPEED or distance or both travelled by a vessel.
2912
log
(v.t.). Said of a ship moving at a specified SPEED according to the indications given by the LOG.
2913
log: chip
A LOG consisting essentially of a weighted wooden quadrant attached to a bridle in such a manner that it will float in a vertical position, ... more
A LOG consisting essentially of a weighted wooden quadrant attached to a bridle in such a manner that it will float in a vertical position, and a LOG LINE, SPEED being measured by casting the quadrant over­board and counting the KNOTS in the line paid out in unit time.
2914
log: Dutchman's
A buoyant object thrown overboard to determine the SPEED of a vessel by timing its passage between two marks, of known distance apart, on th... more
A buoyant object thrown overboard to determine the SPEED of a vessel by timing its passage between two marks, of known distance apart, on the vessel.
2915
log: electric
A graphic recording of the various elec­trical properties of a SEDIMENT or ROCK through which a hole has been drilled.
2916
log: electric submerged
An electrically-operated LOG installed inside the hull of the vessel with a tube extending through the hull into the water.
2917
log: electromagnetic
A LOG consisting of a pulsating MAGNET mounted on a probe pointing downwards with two contacts on the sides of the probe. The movement of th... more
A LOG consisting of a pulsating MAGNET mounted on a probe pointing downwards with two contacts on the sides of the probe. The movement of the water through the MAGNETIC FIELD is reflected by the contacts and the ripple of voltage thus induced can be converted to measure the SPEED of the craft.
2918
log: ground
A device for determining the COURSE and SPEED made good over the GROUND in SHALLOW WATER, consisting of a LEAD attached to a line. The LEAD ... more
A device for determining the COURSE and SPEED made good over the GROUND in SHALLOW WATER, consisting of a LEAD attached to a line. The LEAD is thrown overboard and allowed to rest on the BOTTOM. The COURSE being made good is indicated by the direc­tion the line tends and the SPEED by the amount of line paid out in unit time.
2919
log: patent
Former name for a towed LOG. Any mechanical LOG, particularly a TAFFRAIL LOG.
2920
log: taffrail
A LOG consist­ing essentially of a rota­tor towed through the water by a braided LOG LINE attached to a distance registering device usually ... more
A LOG consist­ing essentially of a rota­tor towed through the water by a braided LOG LINE attached to a distance registering device usually secured at the TAFFRAIL, the railing at the stern. Also called PATENT LOG.