DICTIONARY OF

Immigration Regulations 178 Index Error
Immigration Regulations. Laws and rules regulating the entry of aliens into a country.
Impedance. Circuit resistance to an alternating current when caused by self-inductance,
circuit capacity and ohmic resistance.
Implied Warranties. Assurances that are not made specifically by an insurer but are
implied by his application for insurance. These are, that the ship is seaworthy; that the
venture is lawful; that the venture will be carried out in a lawful manner.
Import. To bring into a country, from abroad.
Imports. Goods brought into a country from another" country.
Impulse. Force applied to cause movement.
In Ballast. Said of a vessel when she is not carrying cargo.
Inboard. Inside a ship. That end, or part, of anything that is nearer to the ship's fore and aft
line than is the other end or part.
'Inchmaree' Clause. Clause, in a policy of marine insurance to cover damage or loss to ship
when caused by latent defect not discoverable by due diligence.
Inch Trim Moment. Moment of force required to change trim of vessel by one inch.
Formula is:-
30x(T.P.I) 2
I.T.M. = -----------------
Moulded breadth (in feet)
Inclination. Leaning. The mutual leaning of two planes, or lines, towards each other. The
angular intersection of two planes or lines.
Inclination of Ecliptic. Angular intersection of plane at Equinoctial by plane of Ecliptic.
Value is 23° 27'.
Inclination of Needle. Angle of magnetic dip. Angle that a magnetic needle will make with
the sensible horizon when freely suspended in the vertical plane.
Inclination of Orbit. Angular intersection of Ecliptic by the orbital plane of a heavenly
body.
Inclination of Ship. Angle of list, or thwartship deviation from the vertical, of a line
perpendicular to the deck of a vessel.
Inclining Experiment. 'Heeling experiment.'
Increment. Quantity, usually variable, that is added to an independent variable in an
invariable expression. When very small it is termed a 'differential'.
Indenture. Sealed and binding agreement entered into by two parties. Particularly applied to
agreement between ship owner or master, and parent and guardian of a minor apprenticed to
sea service.
Independent Piece. Beak-shaped projection from a vessel's stem under the bowsprit.
Index. That which points out, or indicates. Of a logarithm, is the integral number that
precedes the mantissa.
Index Bar. Radial arm moving over a sextant, and carrying index glass and vernier.
Index Correction. Quantity to be applied to an incorrect indication to convert it to a correct
value.
Index Error. Difference between a true value and a value indicated.