| http://www.w3.org/ns/prov#value | - Among the various methods to measure AX, AY and 0, there is a method in which a magnified view projected on a screen is scanned by a scanner comprising a slit S with a constant velocity and the light passing through the slit S is received by a photosensitive element such as a phototube or a photodiode to obtain an electric current corresponding to the intensity of the light.
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