To ensure that a lighthouse is easily distinguished, engineers use clear and distinct varieties of lights[67]. Now-a-days five characters of lights are recognized: the 'fixed light,' the 'flashing light,' the 'revolving,' the 'intermittent,' and the 'double lights in one tower'[65]. Suitable variations and modifications have been supplied by the valuable labors of Fresnel[65].
The lights may also be of an uniform color, some are red, others white, and others again are blue or green[63]. The manageable variety in the range and aspect of the 'beacon-fires' has a special object[63].
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