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  2. Verge escapement - Wikipedia

    en.wikipedia.org/wiki/Verge_escapement

    Huygens claimed an accuracy of 10 seconds per day. In a pendulum clock, the verge escapement is turned 90 degrees so that the crown wheel faces up (top). The verge escapement consists of a wheel shaped like a crown, called the escape wheel, with sawtooth-shaped teeth protruding axially toward the front, and with its axis oriented horizontally.

  3. Holter monitor - Wikipedia

    en.wikipedia.org/wiki/Holter_monitor

    Each Holter system has hardware (called monitor or recorder) for recording the signal, and software for review and analysis of the record. There may be a "patient button" on the front that the patient can press at specific instants such as feeling/being sick, going to bed, taking pills, marking an event of symptoms which is then documented in the symptoms diary, etc.; this records a mark that ...

  4. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    Electrocardiography is the process of producing an electrocardiogram (ECG or EKG [a]), a recording of the heart's electrical activity through repeated cardiac cycles. [4] It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart [5] using electrodes placed on the skin.

  5. AliveCor - Wikipedia

    en.wikipedia.org/wiki/Alivecor

    The AliveCor iPhone ECG case does not fit on the iPhone 5 due to the change in geometry of the phone, and it would need further FDA approval to be used with the iPhone 5. [10] In October of 2013, AliveCor announced a new ECG device that would, for the first time, support Android devices. This new device would no longer need to fit the ...

  6. Complication (horology) - Wikipedia

    en.wikipedia.org/wiki/Complication_(horology)

    It is a mechanical pocket watch which features 57 complications, introduced by Vacheron Constantin in 2015. The company claims that it is the most complicated mechanical pocket watch ever created. The Reference 57260 took eight years to assemble, and has 2826 parts and 31 hands. It weighs 957 g (2.11 lb), and spans 98 millimetres (3.9 in).

  7. U wave - Wikipedia

    en.wikipedia.org/wiki/U_wave

    According to V. Gorshkov-Cantacuzene: "The U wave is the momentum carried by the blood in the coronary arteries and blood vessels". [4] [5] [6]The resistivity of stationary blood is expressed as () = | (+), where is a coefficient, and is the hematocrit; at that time, as during acceleration of the blood flow occurs a sharp decrease in the longitudinal resistance with small relaxation times.