from The Century Dictionary and Cyclopedia

  • n. A machine for ruling diffraction gratings.


Sorry, no etymologies found.


  • Other projects tackled by Siegbahn and his staff include the construction of an electron microscope of a new pattern and an automatically working ruling-engine for scratching well-defined gratings (with up to 1,800 lines per mm), especially for X-rays and the extreme ultraviolet field.

    Manne Siegbahn - Biography


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