DICTIONARY OF

Log 206 Long Glass
Log. Instrument or apparatus for ascertaining ship's speed through water and/or distance run.
2. Log book. 3. Abbreviation for 'Logarithm'.
Logarithm. Exponent of the power to which a fixed number called the 'base', must be raised
to produce a given number. Base of common logarithm is 10. Fractional part of the exponent
is termed 'mantissa'.
Log Board. Hinged pair of boards on which log readings, alterations of course, and other
happenings, were entered in chalk during the watch. Superseded by 'Deck', 'Scrap', or
'Rough' Log.
Log Book. Book in which events connected with the ship are entered. Several may be kept,
the principal being Official Log, Deck Log, Mate's Log, Engine-room Log, Wireless Log.
Log Chip. Segmental piece of wood, ballasted along curved edge, attached to log line to
keep it stretched when measuring ship's speed through water.
Log Error. Difference between indication of a mechanical log and the actual distance
travelled through the water. Always expressed as a percentage of the log indication.
Loggerhead. Bollard, in a whale boat, for snubbing harpoon line. 2. Spherical piece of iron
on long handle. Heated and used for melting pitch.
Logging. Entering in a log book. 2. Punishment entailing the entry of man's name, offence
and punishment in the official log book.
Log Glass. Sand glass measuring interval of about half or quarter minute; 14 seconds and 28
seconds being common. Used for timing the line run out when heaving the log.
Log Line. Line attached to a log when streamed. Line used with towed log is non-kinkable
and braided. Line used with ship log is small and specially made so that it will not stretch
unduly.
Log Line Splice. Splice put in olden log line. End of one part was spliced some little
distance along other part; end of other part being laid around first part and then spliced.
Sometimes called a 'Water Splice'.
Log Oil. Specially-prepared oil for lubricating mechanical logs. Log Reel. Reel having
extensions to the axle on which it turns, these extensions being used as handles when
streaming the log.
Log Ship. 'Log Chip.'
Log Slate. Slate used for same purpose as 'Log Board'.
London Conference Rules of Affreightment, 1893. Six rules that can be inserted in
contracts of affreightment to clarify shipowner's responsibilities and immunities.
Longboat. Formerly, longest and largest boat carried by a merchant ship. Length between
32 and 40 ft., beam 8 to 10 ft., carvel-built and flat floored.
Long Gasket. Length of small rope used at sea for securing a sail to yard when furled.
Long Glass. Sand glass used with ship log for speeds up to five knots. Runs down in 28 or
30 seconds. 2. A telescope.