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  2. Ballast - Wikipedia

    en.wikipedia.org/wiki/Ballast

    Ballast weight is also added to a race car to alter its performance. In most racing series, cars have a minimum allowable weight. Often, the actual weight of the car is lower, so ballast is used to bring it up to the minimum. The advantage is that the ballast can be positioned to affect the car's handling by changing its load distribution.

  3. Ballast (car racing) - Wikipedia

    en.wikipedia.org/wiki/Ballast_(car_racing)

    Ballast weights may be added to a race car to alter its performance. [1] In most racing series, cars have a minimum weight. Often, the actual weight of the car is lower, so ballast is used to bring it up to the minimum. The advantage is that the ballast can be positioned to affect the car's handling by changing its weight distribution.

  4. Battery holder - Wikipedia

    en.wikipedia.org/wiki/Battery_holder

    By the 1920s, battery holders used twin metal clips (like fuse holders) to hold the battery in place while making electrical contact. Patent no. 1439429 was granted in Dec. 1922 for an assembly with two spring arm clips, a small switch, and a lamp assembly on the end of connected wires.

  5. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    Multimeter test leads. A multimeter can use many different test probes to connect to the circuit or device under test. Crocodile clips, retractable hook clips, and pointed probes are the three most common types. Tweezer probes are used for closely spaced test points, as for instance surface-mount devices. The connectors are attached to flexible ...

  6. Tamping machine - Wikipedia

    en.wikipedia.org/wiki/Tamping_machine

    Jackson 6700 switch tamping machine A Plasser & Theurer 09-16 CSM Tamper / Liner A MATISA tamper at Keighley in February 2017 Customer VolkerRail. A tamping machine or ballast tamper, informally simply a tamper, is a self-propelled, rail-mounted machine used to pack (or tamp) the track ballast under railway tracks to make the tracks and roadbed more durable and level.

  7. Test light - Wikipedia

    en.wikipedia.org/wiki/Test_light

    A test light, test lamp, voltage tester, or mains tester is a piece of electronic test equipment used to determine the presence of electricity in a piece of equipment under test. A test light is simpler and less costly than a measuring instrument such as a multimeter , and often suffices for checking for the presence of voltage on a conductor.