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  2. Gas volume corrector - Wikipedia

    en.wikipedia.org/wiki/Gas_volume_corrector

    Gas volume corrector - device for calculating, summing and determining increments of gas volume, measured by gas meter if it were operating base conditions. For this purpose, uses as input the gas volume, measured by the gas meter and other parameters such as: gas pressure and temperature.

  3. Prism cover test - Wikipedia

    en.wikipedia.org/wiki/Prism_Cover_Test

    Either BASE IN for an exodeviation (eye turned out), BASE OUT for an esodeviation (eye turned in), BASE UP for a hypodeviation (eye turned down) or BASE DOWN for a hyperdeviation (eye turned up). Steps: 1. The patient should be measured in primary position first and then in any other positions of gaze of concern.

  4. Base conditions - Wikipedia

    en.wikipedia.org/wiki/Base_conditions

    Base conditions, also known as standard conditions, consist of a specified absolute pressure and temperature. To ensure accuracy, it is important to refer to base conditions when measuring the volume of a sample of liquid or gas. This applies to both static measurement and flow measurement .

  5. Gas meter - Wikipedia

    en.wikipedia.org/wiki/Gas_meter

    A gas meter is a specialized flow meter, used to measure the volume of fuel gases such as natural gas and liquefied petroleum gas. Gas meters are used at residential, commercial, and industrial buildings that consume fuel gas supplied by a gas utility. Gases are more difficult to measure than liquids, because measured volumes are highly ...

  6. Maddox rod - Wikipedia

    en.wikipedia.org/wiki/Maddox_rod

    - BD: base down prisms - BU: base up prisms - BO: base out prisms - BI: base in prisms - eso: esotropia - exo: exotropias - L/R: left hypertropia or right hypotropia - R/L: right hypertropia or left hypotropia Double Maddox rod test. The double Maddox rod test can also be used to assess torsion and measure cyclotropias.

  7. Thomas Thorp (scientific instrument manufacturer) - Wikipedia

    en.wikipedia.org/wiki/Thomas_Thorp_(scientific...

    Thomas Thorp in Algiers, May 1900. Thomas Thorp (1850–1914) was an English manufacturer of scientific instruments credited with inventing the first practical coin-in-the-slot gas meter, with innovations in the field of photography, including that involving colour, and for producing an early example of what has since been developed into the modern spectrohelioscope.

  8. Exophoria - Wikipedia

    en.wikipedia.org/wiki/Exophoria

    Exophoria. Exophoria is a form of heterophoria in which there is a tendency of the eyes to deviate outward. [1] During examination, when the eyes are dissociated, the visual axes will appear to diverge away from one another. [2] The axis deviation in exophoria is usually mild compared with that of exotropia .

  9. Prism fusion range - Wikipedia

    en.wikipedia.org/wiki/Prism_fusion_range

    When measuring horizontal fusion ranges, base in prisms assess fusional divergence while base out prisms assess fusional convergence. The vertical fusional vergence amplitude can also be measured with base up and base down prisms although the horizontal PFR is typically the main focus when testing.

  10. Gas meter prover - Wikipedia

    en.wikipedia.org/wiki/Gas_meter_prover

    A gas meter prover is a device to verify the accuracy of a gas meter. Provers are typically used in gas meter repair facilities, municipal gas meter shops, and public works shops. Provers work by passing a known volume of air through a meter, while monitoring the gas meter's register, index, or internal displacement.

  11. Explosimeter - Wikipedia

    en.wikipedia.org/wiki/Explosimeter

    Explosimeter. An explosimeter is a gas detector which is used to measure the amount of combustible gases present in a sample. When a percentage of the lower explosive limit (LEL) of an atmosphere is exceeded, an alarm signal on the instrument is activated. The device, also called a combustible gas detector, operates on the principle of ...