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  2. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    Levelling or leveling ( American English; see spelling differences) is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure vertical position with respect to a vertical datum, and in construction to measure ...

  3. Attenuator (electronics) - Wikipedia

    en.wikipedia.org/wiki/Attenuator_(electronics)

    passive. Electronic symbol. 100 Watt power attenuator. An attenuator is a passive broadband electronic device that reduces the power of a signal without appreciably distorting its waveform . An attenuator is effectively the opposite of an amplifier, though the two work by different methods.

  4. Elastomeric bridge bearing - Wikipedia

    en.wikipedia.org/wiki/Elastomeric_bridge_bearing

    Elastomeric bearing pads, to serve as bridge beam supports heads. An elastomeric bridge bearing, also known as a pot bearing or elastomeric bearing, is a commonly used modern bridge bearing. The term encompasses several different types of bearings including bearing pads, bridge bearings, laminated elastomeric bearings, and seismic isolators ...

  5. T pad - Wikipedia

    en.wikipedia.org/wiki/T_pad

    Schematic circuit of a T-pad attenuator. The T pad is a specific type of attenuator circuit in electronics whereby the topology of the circuit is formed in the shape of the letter "T". Attenuators are used in electronics to reduce the level of a signal. They are also referred to as pads due to their effect of padding down a signal by analogy ...

  6. Vibration isolation - Wikipedia

    en.wikipedia.org/wiki/Vibration_isolation

    Vibration isolation is the prevention of transmission of vibration from one component of a system to others parts of the same system, as in buildings or mechanical systems. [1] Vibration is undesirable in many domains, primarily engineered systems and habitable spaces, and methods have been developed to prevent the transfer of vibration to such ...

  7. Level staff - Wikipedia

    en.wikipedia.org/wiki/Level_staff

    Level staff. A level staff, also called levelling rod, is a graduated wooden or aluminium rod, used with a levelling instrument to determine the difference in height between points or heights of points above a vertical datum . When used for stadiametric rangefinding, the level staff is called a stadia rod .

  8. Π pad - Wikipedia

    en.wikipedia.org/wiki/Π_pad

    The Π pad ( pi pad) is a specific type of attenuator circuit in electronics whereby the topology of the circuit is formed in the shape of the Greek capital letter pi (Π). Attenuators are used in electronics to reduce the level of a signal. They are also referred to as pads due to their effect of padding down a signal by analogy with acoustics.

  9. AOL Mail

    mail.aol.com

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

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