Relating to the standard magnetic compass.
Related Terms |
ARMATURE DEMAGNETIZATION
The reduction in the effective magnetic lines of force, produced by the armature current.
|
EMISSION SPECTROMETER
Works on the basis that atoms of metallic and other particular elements emit light at characteristic wavelengths when they are excited in a flame, arc, or spark. Excited light is directed through an entrance slit in the spectrometer. This light penetrates the slit, falls on a grate, and is dispersed and reflected. The spectrometer is calibrated by a series of standard samples containing known amounts of the elements of interest. By exciting these standard samples, an analytical curve can be established which gives the relationship between the light intensity and its concentration in the fluid.
|
AIR GAP
The space between magnetic poles, or between the rotating and stationary assemblies in a motor or generator.
|
HALVING
The process of adjusting magnetic compass correctors so as to remove half of the deviation on the opposite cardinal or adjacent intercardinal headings to those on which adjustment was originally made when all deviation was removed. This is done to equalize the error on opposite headings.
|
HEELING MAGNET
A permanent magnet placed vertically in a tube under the center of a marine magnetic compass, to correct for heeling error.
|
GRID MAGNETIC ANGLE
Angular difference in direction between grid north and magnetic north. It is measured east or west from grid north. Grid magnetic angle is sometimes called GRID VARIATION or GRIVATION.
|
FABRICATION INTEGRITY POINT
The differential gas pressure at which the first stream of gas bubbles are emitted from a wetted filter element under standard test conditions.
|
ISO VISCOSITY GRADE
A number indicating the nominal viscosity of an industrial fluid lubricant at 40°C (104°F) as defined by ASTM Standard Viscosity System for Industrial Fluid Lubricants D 2422. Essentially identical to ISO Standard 3448.
|
HACK
A chronometer which has failed to meet the exacting require- ments of a standard chronometer, and is used for timing observations of celestial bodies, regulating ship's clocks, etc. A comparing watch, which may be of high quality, is normally used for timing celestial observations, the watch being compared with the chronometer, preferably both before and after observations. Sometimes called HACK CHRONOMETER.
|
HEELING ADJUSTER
A dip needle with a sliding weight that can be moved along one of its arms to balance magnetic force, used to determine the correct position of a heeling magnet.
|
