A helio or sun-reflecting signal was evidently the desideratum.
Source: wiktionary
Helio
Synonyms for "helio" (1 found)
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Closest matches (1)
Noun(1 words)
Related word relations
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22 entriesShowing 16 of 22 words.
Sample sentences
3 total sentences available.
A light keeper's duties require him to be alone on a station for days or even weeks at a time, showing a helio to the observer in the afternoon for two or three hours and watching by the signal lamp at night.
Source: wiktionary
On a cloudy but bright day, it is possible to use a helio effectively over moderate distances of about 6 miles. Light keepers should be made aware of this, since they often think that brilliant sun is essential.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.