World war listening device Stock Photos and Images
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World war listening device Stock Photos and Images
world war one listening device to detect enemy aircraft Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-world-war-one-listening-device-to-detect-enemy-aircraft-76390940.htmlRMEC7WBT–world war one listening device to detect enemy aircraft
Imperial Japanese soldiers operate a 'war tuba', a listening device to warn of approaching aircraft before the wide use of radar, ca. 1933. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/imperial-japanese-soldiers-operate-a-war-tuba-a-listening-device-to-warn-of-approaching-aircraft-before-the-wide-use-of-radar-ca-1933-image230112878.htmlRMRAAF92–Imperial Japanese soldiers operate a 'war tuba', a listening device to warn of approaching aircraft before the wide use of radar, ca. 1933.
USA - 1939-1945 - Acoustic listening device used in World War II - Photo: Geopix Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/usa-1939-1945-acoustic-listening-device-used-in-world-war-ii-photo-geopix-image452329440.htmlRM2H7WAPT–USA - 1939-1945 - Acoustic listening device used in World War II - Photo: Geopix
French, soldier, army, military, acoustic, listening, device, air planes, noise, anti-aircraft, Western Front, World War I, War, Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-french-soldier-army-military-acoustic-listening-device-air-planes-43913384.htmlRMCFCBY4–French, soldier, army, military, acoustic, listening, device, air planes, noise, anti-aircraft, Western Front, World War I, War,
The photos date to the 1920s. The caption reads: Anti-Aircraft Devices Observation post fitted with instruments for gauging the height and speed of enemy aircraft, a giant searchlight, a listening post and a “75” gun installed on the outskirts of Paris. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-photos-date-to-the-1920s-the-caption-reads-anti-aircraft-devices-observation-post-fitted-with-instruments-for-gauging-the-height-and-speed-of-enemy-aircraft-a-giant-searchlight-a-listening-post-and-a-75-gun-installed-on-the-outskirts-of-paris-image265023113.htmlRFWB4RK5–The photos date to the 1920s. The caption reads: Anti-Aircraft Devices Observation post fitted with instruments for gauging the height and speed of enemy aircraft, a giant searchlight, a listening post and a “75” gun installed on the outskirts of Paris.
Sound mirror, early warning radar Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/sound-mirror-early-warning-radar-image353091032.htmlRF2BECK60–Sound mirror, early warning radar
Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-allied-anti-aircraft-listening-device-which-amplified-the-sound-of-78824382.htmlRMEG6N8E–Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945.
The 'ears' of the anti-aircraft defenders of Paris - A 'poste d'ecoute' or listening-post fitted with four 'reserved megaphones' with microphone. Photo from 1915. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-ears-of-the-anti-aircraft-defenders-of-paris-a-poste-decoute-or-listening-post-fitted-with-four-reserved-megaphones-with-microphone-photo-from-1915-image501317933.htmlRM2M3H03W–The 'ears' of the anti-aircraft defenders of Paris - A 'poste d'ecoute' or listening-post fitted with four 'reserved megaphones' with microphone. Photo from 1915.
A French listening sentry, 1915 Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-a-french-listening-sentry-1915-37035335.htmlRMC472XF–A French listening sentry, 1915
![Anti-aircraft device, First World War, 1914-1918, (c1920). 'The War against German Aircraft: a "Listening Post" in the French anti-aircraft Section. These listening posts in the French army consist of four huge horns, which gather up the slightest sound and magnify it by means of a microphone, so that it is impossible for an enemy or other aviator to approach unheard. The horns may be described as reverse megaphones.' From "The Great World War - A History" Volume IV, edited by Frank A Mumby. [The Gresham Publishing Company Ltd, London, c1920] Stock Photo](https://c8.alamy.com/comp/W6P91M/anti-aircraft-device-first-world-war-1914-1918-c1920-the-war-against-german-aircraft-a-quotlistening-postquot-in-the-french-anti-aircraft-section-these-listening-posts-in-the-french-army-consist-of-four-huge-horns-which-gather-up-the-slightest-sound-and-magnify-it-by-means-of-a-microphone-so-that-it-is-impossible-for-an-enemy-or-other-aviator-to-approach-unheard-the-horns-may-be-described-as-reverse-megaphones-from-quotthe-great-world-war-a-historyquot-volume-iv-edited-by-frank-a-mumby-the-gresham-publishing-company-ltd-london-c1920-W6P91M.jpg "Anti-aircraft device, First World War, 1914-1918, (c1920). 'The War against German Aircraft: a "Listening Post" in the French anti-aircraft Section. These listening posts in the French army consist of four huge horns, which gather up the slightest sound and magnify it by means of a microphone, so that it is impossible for an enemy or other aviator to approach unheard. The horns may be described as reverse megaphones.' From "The Great World War - A History" Volume IV, edited by Frank A Mumby. [The Gresham Publishing Company Ltd, London, c1920] Stock Photo")
Anti-aircraft device, First World War, 1914-1918, (c1920). 'The War against German Aircraft: a "Listening Post" in the French anti-aircraft Section. These listening posts in the French army consist of four huge horns, which gather up the slightest sound and magnify it by means of a microphone, so that it is impossible for an enemy or other aviator to approach unheard. The horns may be described as reverse megaphones.' From "The Great World War - A History" Volume IV, edited by Frank A Mumby. [The Gresham Publishing Company Ltd, London, c1920] Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/anti-aircraft-device-first-world-war-1914-1918-c1920-the-war-against-german-aircraft-a-quotlistening-postquot-in-the-french-anti-aircraft-section-these-listening-posts-in-the-french-army-consist-of-four-huge-horns-which-gather-up-the-slightest-sound-and-magnify-it-by-means-of-a-microphone-so-that-it-is-impossible-for-an-enemy-or-other-aviator-to-approach-unheard-the-horns-may-be-described-as-reverse-megaphones-from-quotthe-great-world-war-a-historyquot-volume-iv-edited-by-frank-a-mumby-the-gresham-publishing-company-ltd-london-c1920-image262333504.htmlRMW6P91M–Anti-aircraft device, First World War, 1914-1918, (c1920). 'The War against German Aircraft: a "Listening Post" in the French anti-aircraft Section. These listening posts in the French army consist of four huge horns, which gather up the slightest sound and magnify it by means of a microphone, so that it is impossible for an enemy or other aviator to approach unheard. The horns may be described as reverse megaphones.' From "The Great World War - A History" Volume IV, edited by Frank A Mumby. [The Gresham Publishing Company Ltd, London, c1920]
Listening device used to detect approach of Zeppelins; operated by Spanish? soldier April 1917, during World War I Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/listening-device-used-to-detect-approach-of-zeppelins-operated-by-spanish-soldier-april-1917-during-world-war-i-image271861324.htmlRMWP89W0–Listening device used to detect approach of Zeppelins; operated by Spanish? soldier April 1917, during World War I
A WWI tunnellers geophones, used to listen for enemy activity, Imperial War Museum, London, UK. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-wwi-tunnellers-geophones-used-to-listen-for-enemy-activity-imperial-war-museum-london-uk-image501999792.htmlRM2M4M1T0–A WWI tunnellers geophones, used to listen for enemy activity, Imperial War Museum, London, UK.
Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/redcar-sound-mirror-world-war-1-ww1-acoustic-listening-device-now-surrounded-by-a-modern-housing-estate-at-redcar-north-yorkshire-image264994950.htmlRFWB3FNA–Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire.
Concrete 'ears' on the cliffs of Dover. Used as a listening device during WWII these are scattered all along the coast. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-concrete-ears-on-the-cliffs-of-dover-used-as-a-listening-device-during-50382545.htmlRFCWY3CH–Concrete 'ears' on the cliffs of Dover. Used as a listening device during WWII these are scattered all along the coast.
The field postcard from 1918 shows German soldiers sitting at a table listening to a radio device. The backside of the postcard, the handwritten date is 08.10.1918 and the indicated location is Champagne in France. On 11 November 1918, Germany capitulated. The First World War was carried out in Europe, the Middle East, Africa, East Asia and on the world's oceans from 1914-1918. Photo: Sammlung Sauer - NO WIRE SERVICE Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-field-postcard-from-1918-shows-german-soldiers-sitting-at-a-table-image67064640.htmlRMDW31HM–The field postcard from 1918 shows German soldiers sitting at a table listening to a radio device. The backside of the postcard, the handwritten date is 08.10.1918 and the indicated location is Champagne in France. On 11 November 1918, Germany capitulated. The First World War was carried out in Europe, the Middle East, Africa, East Asia and on the world's oceans from 1914-1918. Photo: Sammlung Sauer - NO WIRE SERVICE
Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-allied-anti-aircraft-listening-device-which-amplified-the-sound-of-78824291.htmlRMEG6N57–Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945.
American soldiers using a geophone instrument for underground listening during World War One. The geophone played a significant role in detecting mining and countermining activities, ultimately aiding in their prevention. Photograph taken by the Signal Corps, issued in 1919. Image number 30735. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/american-soldiers-using-a-geophone-instrument-for-underground-listening-during-world-war-one-the-geophone-played-a-significant-role-in-detecting-mining-and-countermining-activities-ultimately-aiding-in-their-prevention-photograph-taken-by-the-signal-corps-issued-in-1919-image-number-30735-image558210154.htmlRM2RC4JMX–American soldiers using a geophone instrument for underground listening during World War One. The geophone played a significant role in detecting mining and countermining activities, ultimately aiding in their prevention. Photograph taken by the Signal Corps, issued in 1919. Image number 30735.
Old German-made blood pressure measuring device with brown wooden box Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/old-german-made-blood-pressure-measuring-device-with-brown-wooden-box-image558364290.htmlRF2RCBK9P–Old German-made blood pressure measuring device with brown wooden box
Signal Battalion, One hundred and seventeenth Field Signal Battalion outpost 'listening in' on a suspicious wire. Taken in January 1918. Censored and released on March 8, 1918 by the War College Division. Photograph number 86/37. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/signal-battalion-one-hundred-and-seventeenth-field-signal-battalion-outpost-listening-in-on-a-suspicious-wire-taken-in-january-1918-censored-and-released-on-march-8-1918-by-the-war-college-division-photograph-number-8637-image558147347.htmlRM2RC1PHR–Signal Battalion, One hundred and seventeenth Field Signal Battalion outpost 'listening in' on a suspicious wire. Taken in January 1918. Censored and released on March 8, 1918 by the War College Division. Photograph number 86/37.
![A soldier sits at the crank handle of a French listening device mounted on a trailer. Unknown location, photo taken in 1940. [automated translation] Stock Photo](https://c8.alamy.com/comp/2X0GHD5/a-soldier-sits-at-the-crank-handle-of-a-french-listening-device-mounted-on-a-trailer-unknown-location-photo-taken-in-1940-automated-translation-2X0GHD5.jpg "A soldier sits at the crank handle of a French listening device mounted on a trailer. Unknown location, photo taken in 1940. [automated translation] Stock Photo")
A soldier sits at the crank handle of a French listening device mounted on a trailer. Unknown location, photo taken in 1940. [automated translation] Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-soldier-sits-at-the-crank-handle-of-a-french-listening-device-mounted-on-a-trailer-unknown-location-photo-taken-in-1940-automated-translation-image602727809.htmlRM2X0GHD5–A soldier sits at the crank handle of a French listening device mounted on a trailer. Unknown location, photo taken in 1940. [automated translation]
Army, U.S. Field Buzzer, 1915. First World War: device which could be used as a field telephone, or by use of the buzzer, could also send Morse code via audio. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/army-us-field-buzzer-1915-first-world-war-device-which-could-be-used-as-a-field-telephone-or-by-use-of-the-buzzer-could-also-send-morse-code-via-audio-image485217911.htmlRM2K5BGB3–Army, U.S. Field Buzzer, 1915. First World War: device which could be used as a field telephone, or by use of the buzzer, could also send Morse code via audio.
World war two communications equipment at the Porthcurno telegraph museum in Cornwall, UK Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/world-war-two-communications-equipment-at-the-porthcurno-telegraph-image67117655.htmlRMDW5D73–World war two communications equipment at the Porthcurno telegraph museum in Cornwall, UK
Budapest, Hungary - November 26th, 2022: A tourist listening at an old wartime early warning air raid listening device at the foot of Buda hill. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/budapest-hungary-november-26th-2022-a-tourist-listening-at-an-old-wartime-early-warning-air-raid-listening-device-at-the-foot-of-buda-hill-image552195733.htmlRF2R2AK85–Budapest, Hungary - November 26th, 2022: A tourist listening at an old wartime early warning air raid listening device at the foot of Buda hill.
9-foot parabolic sound detector mobile type, front view. This image was taken in December 1918 at Ellington Field in Houston, Texas. The sound detector was utilized for military activities during World War One. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/9-foot-parabolic-sound-detector-mobile-type-front-view-this-image-was-taken-in-december-1918-at-ellington-field-in-houston-texas-the-sound-detector-was-utilized-for-military-activities-during-world-war-one-image558173646.htmlRM2RC3052–9-foot parabolic sound detector mobile type, front view. This image was taken in December 1918 at Ellington Field in Houston, Texas. The sound detector was utilized for military activities during World War One.
Sound mirror, early warning radar Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/sound-mirror-early-warning-radar-image353090100.htmlRF2BECJ0M–Sound mirror, early warning radar
Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945. (BSLOC 2014 10 167) Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-allied-anti-aircraft-listening-device-which-amplified-the-sound-of-170506931.htmlRMKWB797–Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945. (BSLOC 2014 10 167)
Dictographs used by the Allied Forces for spying and espionage during World War II on display at the National Air Force Museum of Canada in Trenton, Ontario, Canada, on June 10, 2012. (Photo by Creative Touch Imaging Ltd./NurPhoto) Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/dictographs-used-by-the-allied-forces-for-spying-and-espionage-during-world-war-ii-on-display-at-the-national-air-force-museum-of-canada-in-trenton-ontario-canada-on-june-10-2012-photo-by-creative-touch-imaging-ltdnurphoto-image489669688.htmlRM2KCJAK4–Dictographs used by the Allied Forces for spying and espionage during World War II on display at the National Air Force Museum of Canada in Trenton, Ontario, Canada, on June 10, 2012. (Photo by Creative Touch Imaging Ltd./NurPhoto)
This is an image of a camouflage listening suit. It was taken on January 2, 1918, by photographer MA HORES. The suit has a wire screen covered with artificial grass to blend in with the surroundings. The photograph was released to C.P.I on the same day. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/this-is-an-image-of-a-camouflage-listening-suit-it-was-taken-on-january-2-1918-by-photographer-ma-hores-the-suit-has-a-wire-screen-covered-with-artificial-grass-to-blend-in-with-the-surroundings-the-photograph-was-released-to-cpi-on-the-same-day-image558253976.htmlRM2RC6JJ0–This is an image of a camouflage listening suit. It was taken on January 2, 1918, by photographer MA HORES. The suit has a wire screen covered with artificial grass to blend in with the surroundings. The photograph was released to C.P.I on the same day.
Sound Mirrors at Fan Bay Deep Shelter Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/sound-mirrors-at-fan-bay-deep-shelter-image255543247.htmlRMTRN00F–Sound Mirrors at Fan Bay Deep Shelter
This is a photograph taken in December 1918 at Ellington Field in Houston, Texas. It shows an experimental 9-foot parabolic sound detector, which was a mobile type device with a drawn sheet metal frame. This frame design has since been superseded by the T framing. The photograph was received from source c.0. 54860. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/this-is-a-photograph-taken-in-december-1918-at-ellington-field-in-houston-texas-it-shows-an-experimental-9-foot-parabolic-sound-detector-which-was-a-mobile-type-device-with-a-drawn-sheet-metal-frame-this-frame-design-has-since-been-superseded-by-the-t-framing-the-photograph-was-received-from-source-c0-54860-image558188661.htmlRM2RC3K99–This is a photograph taken in December 1918 at Ellington Field in Houston, Texas. It shows an experimental 9-foot parabolic sound detector, which was a mobile type device with a drawn sheet metal frame. This frame design has since been superseded by the T framing. The photograph was received from source c.0. 54860.
Acoustic Mirror Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/acoustic-mirror-image465929729.htmlRM2J20X3D–Acoustic Mirror
Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/redcar-sound-mirror-world-war-1-ww1-acoustic-listening-device-now-surrounded-by-a-modern-housing-estate-at-redcar-north-yorkshire-image264994976.htmlRFWB3FP8–Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire.
Wide angle view of the Sound Mirrors at Fan Bay Deep Shelter Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/wide-angle-view-of-the-sound-mirrors-at-fan-bay-deep-shelter-image348892256.htmlRM2B7HBHM–Wide angle view of the Sound Mirrors at Fan Bay Deep Shelter
Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945. (BSLOC 2014 10 167) Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-allied-anti-aircraft-listening-device-which-amplified-the-sound-of-170508294.htmlRMKWB91X–Allied anti-aircraft listening device which amplified the sound of distant airplane engines. World War 2. Ca. 1941-1945. (BSLOC 2014 10 167)
Banquet Scene with Flag Draping And Men Seated Holding Up Listening Device To One Ear, between 1913 and 1917. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/banquet-scene-with-flag-draping-and-men-seated-holding-up-listening-device-to-one-ear-between-1913-and-1917-image491533433.htmlRM2KFK7WD–Banquet Scene with Flag Draping And Men Seated Holding Up Listening Device To One Ear, between 1913 and 1917.
Second world war communications equipment at the Porthcurno telegraph museum in Cornwall, UK Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/second-world-war-communications-equipment-at-the-porthcurno-telegraph-image67117660.htmlRMDW5D78–Second world war communications equipment at the Porthcurno telegraph museum in Cornwall, UK
Acoustic Mirror Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/acoustic-mirror-image465929716.htmlRM2J20X30–Acoustic Mirror
Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/redcar-sound-mirror-world-war-1-ww1-acoustic-listening-device-now-surrounded-by-a-modern-housing-estate-at-redcar-north-yorkshire-image264995026.htmlRFWB3FT2–Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire.
second world war communications equipment at the Porthcurno Telegraph museum in Cornwall, UK Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/second-world-war-communications-equipment-at-the-porthcurno-telegraph-image67117651.htmlRMDW5D6Y–second world war communications equipment at the Porthcurno Telegraph museum in Cornwall, UK
Acoustic Mirror Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/acoustic-mirror-image465929709.htmlRM2J20X2N–Acoustic Mirror
Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/redcar-sound-mirror-world-war-1-ww1-acoustic-listening-device-now-surrounded-by-a-modern-housing-estate-at-redcar-north-yorkshire-image264995011.htmlRFWB3FRF–Redcar Sound Mirror World War 1 WW1 acoustic listening device now surrounded by a modern housing estate at Redcar, North Yorkshire.
![First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photo](https://c8.alamy.com/comp/GKBW04/first-world-war-sound-mirror-built-as-acoustic-defence-at-boulby-near-GKBW04.jpg "First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photo")
First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-first-world-war-sound-mirror-built-as-acoustic-defence-at-boulby-near-115201748.htmlRMGKBW04–First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission]
second world war communications equipment at the Porthcurno telegraph museum in Cornwall, UK Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/second-world-war-communications-equipment-at-the-porthcurno-telegraph-image67117648.htmlRMDW5D6T–second world war communications equipment at the Porthcurno telegraph museum in Cornwall, UK
![First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photo](https://c8.alamy.com/comp/GKBW02/first-world-war-sound-mirror-built-as-acoustic-defence-at-boulby-near-GKBW02.jpg "First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photo")
First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-first-world-war-sound-mirror-built-as-acoustic-defence-at-boulby-near-115201746.htmlRMGKBW02–First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission]
![First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photo](https://c8.alamy.com/comp/GKBW03/first-world-war-sound-mirror-built-as-acoustic-defence-at-boulby-near-GKBW03.jpg "First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photo")
First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission] Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-first-world-war-sound-mirror-built-as-acoustic-defence-at-boulby-near-115201747.htmlRMGKBW03–First World War sound mirror built as acoustic defence at Boulby near Whitby [on private land; photographed with landowners' permission]
