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MOIRE FRINGES APPLIED TO LINEAR
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adjustment amplitude angles of incidence angular applied approximately beams carriage centre circuit collimator conﬁned contrast convenient counting curve dark current decollimating lens Dekatron difference diffraction gratings direction displacement effect equal equipment exit slit factor ﬁeld slot ﬁgure ﬁlament ﬁrst ﬁtted ﬁtting ﬁxed ﬂuctuations focal length fraction fringe counter fringe-width gap thickness gap-width goniometers IIII IIII IIIIII IIIIII incidence and emergence index grating index-grating assembly inter-ruling angle interpolation lamp lathe lenses light linear lines per inch load resistance maximum ment method metrological micrometer millimetre minimum deviation moiré fringes mounted movement National Physical Laboratory normal obtained operation optical orbit output parallel periodic error phase photocell phototransistor pitch plane position practical produced pulse quadrature radial gratings range reading reduced relative rotation ruling width ruling-width rulings per inch scale grating screw servo signiﬁcant sinusoidal spectral st/w target tion transistor trigger point variation vernier visual voltage wavelength zero