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Telephony, Equipment Brown repeater, c 1900s

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UIS5064617

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Telephony, Equipment Brown repeater, c 1900s

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Telephony, Equipment Brown repeater, c 1900s. 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

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Largest available format 3459 × 3504 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3459 × 3504 px 293 × 297 mm 1.2 MB
Medium 1011 × 1024 px 86 × 87 mm 939 KB

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