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Значения термина use the heliograph на английском

Значения для термина "use the heliograph" отсутствуют.
Использование термина use the heliograph на английском
1
These lookouts now have telephones, but until last summer they used the heliograph instead.
Tenting To-night / A Chronicle of Sport and Adventure in Glacier...
2
He therefore used the heliograph, and with it flashed the news to the Spanish stations on the Canto River, asking that reinforcements be sent him.
The Great Round World and What Is Going On In It, Vol. 1, No. 47...