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An athwartship horizontal structural member supporting a flat or deck
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Related Terms |
DEFLECTION
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PHOTOTUBE CURRENT METER
A device for measuring the speed of water currents in which a perforated disk, which rotates with the current by means of a propeller, is placed in the path of a beam of light that is then reflected from a mirror onto a phototube.
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PENETROMETER
1. An instrument that measures the penetrating power of a beam of xrays or other penetrating radiation. 2. An instrument used to determine the consistency of a material by measurement of the depth to which a standard needle penetrates into it under standard conditions.
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PANORAMIC RADAR
Nonscanning radar which transmits signals over a wide beam in the direction of interest.
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OPTOELECTRONIC SHUTTER
A shutter that uses a Kerr cell to modulate a beam of light.
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OPTICAL MICROPHONE
[ENG ACOUS] A microphone in which the motion of a membrane is detected using a light beam reflected from it, either with the aid of an interferometer or by detecting the deflection of the beam.
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OPTICAL INDICATOR
An instrument which makes a plot of pressure in the cylinder of an engine as a function of piston (or volume) displacement, making use of magnification by optical systems and photographic recording; for example, the small motion of a pressure diaphragm may be transmitted to a mirror to deflect a beam of light.
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NEUTRAL SURFACE
A surface in a bent beam along which material is neither compressed nor extended.
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NEUTRAL AXIS
In a beam bent downward, the line of zero stress below which all fibers are in tension and above which they are in compression.
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MOMENT DIAGRAM
A graph of the bending moment at a section of a beam versus the distance of the section along the beam.
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