“An firm of vehicle proprietors in London has rendered important service to the public in connection with the raids of the German air pirates. When warning of an air raid is gained in the metropolis, explosive sky rockets are fired from various points. Cars then drive via the metropolis streets, honking their horns to appeal to interest. On every single facet of the vehicle, a large indicator is carried, on which is printed the warning, ‘Take Address.’ When the hazard is handed the reverse facet of the indicator is demonstrated, which reads, ‘All Distinct.’ A Boy Scout bugler who rides in the vehicle also assists to notify the citizens that the Huns have departed.”

Scientific American, June 1918

A lot more gems from Scientific American’s initial a hundred seventy five a long time can be observed on our shiny anniversary web page.