airgraph

airgraph

(ˈɛəˌɡrɑːf)
n
1. a system devised in the Second World War in which letters were photographed in miniature and sent by airmail
2. a letter sent by the airgraph system
References in periodicals archive ?
features on the app include the ability to use the Airgraph function to see where and when in your day you have been subjected to the highest levels of carbon monoxide.
George sent his 1944 Christmas cards by airgraph, messages on microfilm that were flown to Britain to be printed and posted to recipients.
This idea of a place of healing is not at all unknown to Tolkien, as he notes in an airgraph to his son Christopher in 1944: "I do not think so well of the concluding chapter of C.