The principal light of two or more lights situated on the same support or neighboring supports.
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BEARING
A support or guide by means of which a moving part such as a shaft or axle is positioned with respect to the other parts of a mechanism.
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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.
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CHOCK, BOAT
A cradle or support for a lifeboat.
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GROUP OCCULTING LIGHT
An occulting light in which the occultations are combined in groups, each group including the same number of occultations, and in which the groups are repeated at regular intervals. The intervals of light separating the occultations within each group are of equal duration and this duration is clearly shorter than the duration of the interval of light between two successive groups.
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HAND LEAD
A light sounding lead (7 to 14 pounds), usually having a line of not more than 25 fathoms
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GROUP QUICK LIGHT
A quick flashing light in which a specified group of flashes is regularly repeated
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FLUID OPACITY
Related to the ability of a fluid to pass light.
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FILTER CORE
The internal duct and filter media support.
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FTIR, Fourier Transform Infrared Spectroscopy
A test where infrared light absorption is used for assessing levels of soot, sulfates, oxidation, nitro-oxidation, glycol, fuel, and water contaminants.
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GROUP FLASHING LIGHT
A flashing light in which the flashes are combined in groups, each group having the same number of flashes, and in which the groups are repeated at regular intervals. The eclipses separating the flashes within each group are of equal duration and this duration is clearly shorter than the duration of the eclipse between two successive groups.
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