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Measurement & Units

  • I3-01: BAROMETER - ANEROID TYPE

    I3-01
    Indicate air pressure.
    The barometer measures air pressure in the closed system; squeezing the bulb increases the air pressure. Pressure readings below ambient atmospheric pressure can be obtained by removing the tube and holding the bulb squeezed while replacing the tube.

  • J5-51: GAUSSMETER

    J5-51
    Demonstrate use of a gaussmeter
    This is a Hall probe gaussmeter of research quality. It can measure fields from a fraction of a gauss to over 10 kilogauss (1 Tesla). Radial (the flat one) and axial (the cylindrical one) probes are included. Ask for magnets (Demonstration J5-04: MAGNETS) and measure their fields with a gaussmeter.
    J5, K1

  • K8-03 LIGHT NANOSECOND

    K8-03
    Shows the distance light travels in one nanosecond
    This stick of wood is slightly less than 30cm. This length is the distance light travels in one billionth of a second
    K8

  • K8-04: SPEED OF LIGHT

    K8-04
    Measure the speed of light

    A laser light pulse a few nanoseconds long is emitted by a light-emitting diode and immediately strikes a partially silvered mirror. The reflected light returns to a phototransistor to give the first pulse of the oscilloscope trace shown in the picture. The light transmitted through the partially silvered mirror reflects off a distant front-surface mirror, in the foreground of the picture, returning to the phototransistor to create the second pulse. The distance the laser beam travels, measured using a metric tape, and the elapsed time, determined from the oscilloscope trace, are used to calculate the speed of light.

    Please Note: Care must be used to position the light reflected from the distant mirror onto the phototransistor. This needs to be carefully monitored while in use, as environmental changes can affect it. Also, if there are issues of signal stability, check the trigger level on the oscilloscope to confirm that it is compatible with the trigger signal.

    K8, ME2

    K8-04A

  • K8-33: NANOSECOND CABLES

    K8-33
    Cables which delay a signal by a fixed time interval.
    In performing research in nuclear and particle physics it is often necessary to introduce short time delays into a signal; this is sometimes done using cables. Included here are cables with delay times of 1, 4 and 8 nanoseconds. These are lemo cables in which the wave velocity is 0.68 c.

  • P4-51: MILLIKAN OIL DROP MODEL

    P4-51
    Demonstrate geometry for the Millikan oil drop experiment.
    This is a non-working model to illustrate the geometry of the Millikan experiment. A helium balloon tethered to the lower plate represents the oil drop. The plates are charged by the Wimshurst machine to create the electric force on the charged oil drop.