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  2. Spherometer - Wikipedia

    en.wikipedia.org/wiki/Spherometer

    A spherometer is an instrument used for the precise measurement of the radius of curvature of a curved surface. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens .

  3. Lens clock - Wikipedia

    en.wikipedia.org/wiki/Lens_clock

    Lens clock. A lens clock is a mechanical dial indicator that is used to measure the dioptric power of a lens.It is a specialized version of a spherometer.A lens clock measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.

  4. Rainbow coloring - Wikipedia

    en.wikipedia.org/wiki/Rainbow_coloring

    It is easy to observe that to rainbow-connect any connected graph , we need at least () colors, where () is the diameter of (i.e. the length of the longest shortest path). On the other hand, we can never use more than m {\displaystyle m} colors, where m {\displaystyle m} denotes the number of edges in G {\displaystyle G} .

  5. Total coloring - Wikipedia

    en.wikipedia.org/wiki/Total_coloring

    Total coloring arises naturally since it is simply a mixture of vertex and edge colorings. The next step is to look for any Brooks-typed or Vizing-typed upper bound on the total chromatic number in terms of maximum degree. The total coloring version of maximum degree upper bound is a difficult problem that has eluded mathematicians for 50 years.

  6. Spectrometer - Wikipedia

    en.wikipedia.org/wiki/Spectrometer

    An XPS spectrometer. A spectrometer (/ s p ɛ k ˈ t r ɒ m ɪ t ər /) is a scientific instrument used to separate and measure spectral components of a physical phenomenon. Spectrometer is a broad term often used to describe instruments that measure a continuous variable of a phenomenon where the spectral components are somehow mixed.

  7. Sphygmomanometer - Wikipedia

    en.wikipedia.org/wiki/Sphygmomanometer

    A sphygmomanometer (/ ˌ s f ɪ ɡ m oʊ m ə ˈ n ɒ m ɪ t ə r / SFIG-moh-mə-NO-mi-tər), also known as a blood pressure monitor, or blood pressure gauge, is a device used to measure blood pressure, composed of an inflatable cuff to collapse and then release the artery under the cuff in a controlled manner, [1] and a mercury or aneroid manometer to measure the pressure.

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