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  2. Electroscope - Wikipedia

    en.wikipedia.org/wiki/Electroscope

    An electroscope can only give a rough indication of the quantity of charge; an instrument that measures electric charge quantitatively is called an electrometer. The electroscope was the first electrical measuring instrument. The first electroscope was a pivoted needle (called the versorium), invented by British physician William Gilbert around ...

  3. Versorium - Wikipedia

    en.wikipedia.org/wiki/Versorium

    Gilbert used the versorium to test whether different materials were "elektrics" (insulators, in modern terms) or non-"elektrics" ().While he didn't devise a theory to explain his findings, it was a good example of how science was starting to change by incorporating empirical studies at the dawn of the Age of Reason. [4]

  4. Telectroscope - Wikipedia

    en.wikipedia.org/wiki/Telectroscope

    Headline from the New York Times article on Szczepanik's telectroscope (April 3, 1898). Nevertheless, the word "telectroscope" was widely accepted. It was used to describe the work of nineteenth century inventors and scientists such as Constantin Senlecq, [6] George R. Carey, [7] Adriano de Paiva, and later Jan Szczepanik, who with Ludwig Kleiberg obtained a British patent (patent nr. 5031) [8 ...

  5. File:Gold leaf electroscope diagram.svg - Wikipedia

    en.wikipedia.org/wiki/File:Gold_leaf...

    The original can be viewed here: Gold leaf electroscope diagram.jpg: . Modifications made by Krzysztof ZajÄ…czkowski (malyszkz) . I, the copyright holder of this work, hereby publish it under the following license:

  6. Faraday's ice pail experiment - Wikipedia

    en.wikipedia.org/wiki/Faraday's_ice_pail_experiment

    A gold-leaf electroscope (E), a sensitive detector of electric charge, is attached by a wire to the outside of the pail. When the charged ball is lowered into the pail without touching it, the electroscope registers a charge, indicating that the ball induces charge in the metal container by electrostatic induction. An opposite charge is induced ...

  7. A UCLA doctor is on a quest to free modern medicine ... - AOL

    www.aol.com/news/ucla-doctor-quest-free-modern...

    Using the bodies of executed people was "a centuries-old practice in anatomy," preferred because anatomists could time their work swiftly after a scheduled death, said Dr. Sabine Hildebrandt, an ...

  8. Photoelectric effect - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_effect

    Gold leaf electroscope demonstrating the photoelectric effect. When the electroscope disk is negatively charged with excess electrons, the gold leaves mutually repel. If high-energy light (such as ultraviolet) is then shone on the disk, electrons are emitted by the photoelectric effect and the leaf repulsion ceases.

  9. History of optics - Wikipedia

    en.wikipedia.org/wiki/History_of_optics

    This has come to be known as emission theory. [6] Hero demonstrated the equality of the angle of incidence and reflection on the grounds that this is the shortest path from the object to the observer. On this basis, he was able to define the fixed relation between an object and its image in a plane mirror.