Wall telephone with Blake transmitter, made by the United Telephone Company, 1880-1890.
This telephone uses a Blake carbon transmitter, designed and patented by Francis Blake (1850-1913) in 1877. It used a platinum contact with a button of carbon to transmit speech, and was found to be more sensitive that earlier transmitter designed used in telephones. Blake was eventually hired by Alexander Graham Bell (1847-1922) and, along with Emile Berliner (1851-1929), designed the Berliner Blake microphone, which was the standard at Bell Telephones for many years.
- Object Number:
main boxes: 280 mm x 301 mm x 78 mm,
handset: 95 mm x 68 mm diameter
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