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Telephony, Equipment

IMAGE number
UIS5069396
Image title
Telephony, Equipment
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
object
Image description

Telephony, Equipment. Brown repeater, c 1918. The Brown repeater was devised to strengthen the pattern of telephone signals by copying them onto another circuit. By sending incoming signals through two wire coils, the Brown repeater produced different magnetic fields. These newly created magnetic fields then vibrated a small metal strip or 'reed' attached to a brass cylinder. The cylinder, which contained carbon granules of the type also used in telephones, altered the strength of the current and therefore amplified the call. The Brown repeater was installed at telephone exchanges to boost long distance calls. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
20th century / invention / thing / phone / year / 1910's / communication / photography

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Not available to clients invoiced in the UK
Largest available format 3504 × 3081 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 3081 px 297 × 261 mm 1.0 MB
Medium 1024 × 901 px 87 × 76 mm 985 KB

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