Indian signallers operating a heliograph, 1935
Photograph, India, North-West Frontier, 1935.
The heliograph used a mirror to reflect sunlight to a distant observer. By moving the mirror, flashes of likght could be used to send Morse code. It was an ideal tool in the mountainous wilderness of the North-West Frontier of India as it allowed long distance communication without a fixed infrastructure.
From an album of 387 photographs compiled by Captain (later Major) Wynne Howes-Roberts, 1st Battalion 13th Frontier Force Rifles, 1935.
NAM Accession Number
NAM. 1997-12-11-188
Copyright/Ownership
National Army Museum, Out of Copyright
Location
National Army Museum, Study collection
Object URL
https://collection.nam.ac.uk/detail.php?acc=1997-12-11-188
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