Air raid siren man Black & White Stock Photos
Air raid siren man, 1952. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-air-raid-siren-man-1952-142215363.htmlRFJ7AD43–Air raid siren man, 1952.
A policeman is fitting an air raid siren along with a warning sign to a police car in Eltham , Kent . 1939 Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-policeman-is-fitting-an-air-raid-siren-along-with-a-warning-sign-to-a-police-car-in-eltham-kent-1939-image359773606.htmlRM2BW92WA–A policeman is fitting an air raid siren along with a warning sign to a police car in Eltham , Kent . 1939
A policeman is fitting an air raid siren along with a warning sign to a police car in Eltham , Kent . 1939 Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-policeman-is-fitting-an-air-raid-siren-along-with-a-warning-sign-to-a-police-car-in-eltham-kent-1939-image359773590.htmlRM2BW92TP–A policeman is fitting an air raid siren along with a warning sign to a police car in Eltham , Kent . 1939
Vocal gas alarm tested . Test are being made at Hendon to discover the best warnings in the event of a gas attack from the air . Sirens are being sounded separately from Hendon Police station , which is in the centre of a ring of observers , policemen the stationed in pairs at distances of 100 , 200 , 300 , 400 yards away . They have sound recording instruments to determine the power and penertration of the various notes . The findings of the observers will be recorded on a special map , and the best siren discovered . Photo shows , a man demonstrating a small movable air raid alarm . 10 March Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/vocal-gas-alarm-tested-test-are-being-made-at-hendon-to-discover-the-best-warnings-in-the-event-of-a-gas-attack-from-the-air-sirens-are-being-sounded-separately-from-hendon-police-station-which-is-in-the-centre-of-a-ring-of-observers-policemen-the-stationed-in-pairs-at-distances-of-100-200-300-400-yards-away-they-have-sound-recording-instruments-to-determine-the-power-and-penertration-of-the-various-notes-the-findings-of-the-observers-will-be-recorded-on-a-special-map-and-the-best-siren-discovered-photo-shows-a-man-demonstrating-a-small-movable-air-raid-alarm-10-march-image359651449.htmlRM2BW3F2H–Vocal gas alarm tested . Test are being made at Hendon to discover the best warnings in the event of a gas attack from the air . Sirens are being sounded separately from Hendon Police station , which is in the centre of a ring of observers , policemen the stationed in pairs at distances of 100 , 200 , 300 , 400 yards away . They have sound recording instruments to determine the power and penertration of the various notes . The findings of the observers will be recorded on a special map , and the best siren discovered . Photo shows , a man demonstrating a small movable air raid alarm . 10 March
Vocal gas alarm tested . Test are being made at Hendon to discover the best warnings in the event of a gas attack from the air . Sirens are being sounded separately from Hendon Police station , which is in the centre of a ring of observers , policemen the stationed in pairs at distances of 100 , 200 , 300 , 400 yards away . They have sound recording instruments to determine the power and penertration of the various notes . The findings of the observers will be recorded on a special map , and the best siren discovered . Photo shows , a man demonstrating a small movable air raid alarm . 10 March Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/vocal-gas-alarm-tested-test-are-being-made-at-hendon-to-discover-the-best-warnings-in-the-event-of-a-gas-attack-from-the-air-sirens-are-being-sounded-separately-from-hendon-police-station-which-is-in-the-centre-of-a-ring-of-observers-policemen-the-stationed-in-pairs-at-distances-of-100-200-300-400-yards-away-they-have-sound-recording-instruments-to-determine-the-power-and-penertration-of-the-various-notes-the-findings-of-the-observers-will-be-recorded-on-a-special-map-and-the-best-siren-discovered-photo-shows-a-man-demonstrating-a-small-movable-air-raid-alarm-10-march-image359651473.htmlRM2BW3F3D–Vocal gas alarm tested . Test are being made at Hendon to discover the best warnings in the event of a gas attack from the air . Sirens are being sounded separately from Hendon Police station , which is in the centre of a ring of observers , policemen the stationed in pairs at distances of 100 , 200 , 300 , 400 yards away . They have sound recording instruments to determine the power and penertration of the various notes . The findings of the observers will be recorded on a special map , and the best siren discovered . Photo shows , a man demonstrating a small movable air raid alarm . 10 March
