A divided triangle method of sight reduction in which a perpendicular is dropped from the GP of the body to the meridian of the observer


Related Terms

DEFLECTION

  1. The displacement of an electron beam from its straight-line path by an electrostatic or electromagnetic field.
  2. Shape change or reduction in the diameter of a conduit, produced without fracturing the material.
  3. Elastic movement or sinking of a loaded structural member, particularly of the mid-span of a beam.

PHASE UNDERVOLTAGE RELAY

Relay which functions by reason of the reduction of one 399 phonemic synthesizer phase voltage in a polyphase circuit. phasing See framing.

NEGATIVE FEEDBACK

Feedback in which a portion of the output of a circuit, device, or machine is fed back 180 out of phase with the input signal, resulting in a decrease of amplification so as to stabilize the amplification with respect to time or frequency, and a reduction in distortion and noise. Also known as inverse feedback; reverse feedback; stabilized feedback.

LOW-REACTANCE GROUNDING

Use of grounding connections with a moderate amount of inductance to effect a moderate reduction in the short-circuit current created by a line-toground fault.

INSTANTANEOUS RECOVERY

The immediate reduction in the strain of a solid when a stress is removed or reduced, in contrast to creep recovery.

ARMATURE DEMAGNETIZATION

The reduction in the effective magnetic lines of force, produced by the armature current.

LARGE SCALE

A scale involving a relatively small reduction in size. A large-scale chart is one covering a small area. The opposite is SMALL SCALE.

ATTENUATION

1. A lessening in amount, particularly the reduction of the amplitude of a wave with distance from the origin. 2. The decrease in the strength of a radar wave resulting from absorption, scattering, and reflection by the medium through which it passes (wave guide, atmosphere) and by obstructions in its path. Also attenuation of the wave may be the result of artificial means, such as the inclusion of an attenuator in the circuitry or by placing an absorbing device in the path of the wave.

COMPARISON OF SIMULTANEOUS OBSERVATIONS

A reduction process in which a short series of tide or tidal current observations at any place is compared with simultaneous observations at a control station where tidal or tidal current constants have previously been deter- mined from a long series of observations. For tides, it is usually used to adjust constants from a subordinate station to the equivalent of that which would be obtained from a 19-year series.

DAYLIGHT SIGNAL LIGHT

A signal light exhibited by day and also, usually with reduced intensity by night. The reduction of intensity is made in order to avoid glare. Daylight signals may be used to indicate whether or not the entrance to a lock is free.

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