Illumination

The best way of illuminating the field of the micrometer is to direct a low but variable light onto the wires, i.e. bright wire illumination. In some micrometers, notably the RETEL which uses a red LED, the field is bright and the wires are seen in shadow. Whilst red is usually regarded as the colour least likely to reduce the

Figure 15.4.

Alternative double distance measurement (Greaney).

Figure 15.4.

Alternative double distance measurement (Greaney).

effectiveness of the eye and distract the observer, some astronomers prefer a different arrangement. Paul Couteau uses a white light to illuminate the wires whilst Wulff Heintz prefers yellow. Observers will appreciate that white light is definitely not recommended for field illumination.

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