|Caption||The picture shows Henry Mance and a colleague in the British army with their heliograph, an instrument that uses a mirror to focus the rays of the sun.|
|Artwork medium||Printed material|
|Copyright notice||© Look and Learn|
|Keywords||soldier sun signal heliograph army mirror Henry Mance British|
|Image ref||Sizes available||Views|
Hi-res: 4,432 x 3,610 pixels
Lo-res: 1,108 x 902 pixels
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