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  2. Tape measure - Wikipedia

    en.wikipedia.org/wiki/Tape_measure

    There are two basic types of cased measuring tapes: spring return tape measures and manual return tape measures. While spring return tape measures are compact and self-retracting, manual return measures are designed for longer distances and often require manual winding, often via hand crank.

  3. Wattmeter - Wikipedia

    en.wikipedia.org/wiki/Wattmeter

    Wattmeter. The wattmeter is an instrument for measuring the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. ...

  4. Wavelength - Wikipedia

    en.wikipedia.org/wiki/Wavelength

    The wavelength of a sine wave, λ, can be measured between any two points with the same phase, such as between crests (on top), or troughs (on bottom), or corresponding zero crossings as shown.

  5. Fizeau experiment - Wikipedia

    en.wikipedia.org/wiki/Fizeau_experiment

    Figure 4. Setup of the Fizeau Experiment (1851). A light ray emanating from the source S ′ is reflected by a beam splitter G and is collimated into a parallel beam by lens L. ...

  6. Electrical measurements - Wikipedia

    en.wikipedia.org/wiki/Electrical_measurements

    Ammeter and Voltmeter on a power supply. Electrical measurements are the methods, devices and calculations used to measure electrical quantities. Measurement of electrical quantities may be done to measure electrical parameters of a system.

  7. Fish measurement - Wikipedia

    en.wikipedia.org/wiki/Fish_measurement

    Standard length (SL) is the length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the hypural plate.

  8. Length contraction - Wikipedia

    en.wikipedia.org/wiki/Length_contraction

    Length contraction was postulated by George FitzGerald (1889) and Hendrik Antoon Lorentz (1892) to explain the negative outcome of the Michelson–Morley experiment and to rescue the hypothesis of the stationary aether (Lorentz–FitzGerald contraction hypothesis).

  9. Interferometry - Wikipedia

    en.wikipedia.org/wiki/Interferometry

    Figure 1. The light path through a Michelson interferometer.The two light rays with a common source combine at the half-silvered mirror to reach the detector. They may either interfere constructively (strengthening in intensity) if their light waves arrive in phase, or interfere destructively (weakening in intensity) if they arrive out of phase, depending on the exact distances between the ...