DICTIONARY OF

Equation 129 Eyebrow
Equation. Two quantities, or groups of quantities, that are equal algebraically or
arithmetically. Also, a constant to be applied to one value to obtain a required value.
Equation of Equal Altitudes. Method of finding time of meridian transit of a heavenly
body by timing an altitude on one side of meridian and then noting instant when altitude is
the same on other side of meridian. Ignoring change in declination, mean of times will be
time of meridian transit.
Equation of Light. Time taken by light of Sun to reach Earth. Value is 08 m 20 sec.
Equation of Time. Difference between mean time and apparent time; between hour angles
of mean and true suns; between right ascensions of mean and true suns. Varies between 16 ¾
minutes minus to apparent time, and 14 ½ minutes plus to it. Is zero about April 15, June 15,
September 1 and December 24.
Equator. That great circle, of terrestrial sphere, whose axis and poles are the rotational axis
and poles of earth. Latitude is measured north and south from it.
Equatorial Air. Name sometimes given to 'Tropical Air'.
Equatorial Counter Current. Ocean current setting E'ly through Doldrums between N and
S Equatorial Currents.
Exmeridian Altitude. Altitude of a heavenly body taken when near to meridian but not on
it. Used for finding latitude.
Expansion. Increase in volume due to application of energy or force, or to release of
compression.
Expansion Joint. Joint across the top decks of a large passenger ship to allow for the
working of that part of the ship in a seaway.
Expansion Trunk. Compartment in oil-carrying vessel. Carries a reserve supply of oil for
compensating changes in volume of cargo due to changes of temperature.
Expiration Clause. Alternative name for 'Continuation Clause'.
Explosives. Defined by statute as including gunpowder, nitro-glycerine, gun cotton, blasting
powder, fulminate of any metal, coloured fibres and every other substance made to produce
a practical effect by explosion, or a pyrotechnic effect.
Express Warranties. Detailed and explicit warranties included in, or written upon, a policy
of marine insurance or some other document incorporated by reference into the policy.
Extending/Extension of Protest. Amplifying/amplification of a protest previously noted in
common form. Must be done within six months of noting.
Extra Flexible Steel Wire Rope. Has 24 wires, around a fibre heart, in each of its six
strands.
Extra Zodiacal Planet, Planet whose orbit extends beyond zodiacal belt. An asteroid.
Eye. Loop of eye splice, particularly one in stays and shrouds.
Eyebolt. Circular loop of metal secured for taking hook of shackle of purchase, or rigging.
Eyebrow. Semicircular guttering above a circular port or a scuttle.