Patent model for Edison speaking telegraph, US Patent #203015

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Object Details

maker

Edison, Thomas Alva

Description (Brief)

A model to accompany the application for US Patent #203015, "Speaking Telegraph," issued 30 April 1878 to Thomas A. Edison. A wooden base supporting a piece of heavy iron tubing, mounted horizontally and carrying a mica diaphragm to which is attached a steel spring that contacts a point on an adjustable shaft.

Location

Currently not on view

Date made

1878

ID Number

EM.252620

catalog number

252620

accession number

49064

patent number

203015

Object Name

Telephone

experimental telephone

Other Terms

Telephone; Telephones

Measurements

overall: 3 1/4 in x 3 in x 5 in; 8.255 cm x 7.62 cm x 12.7 cm

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Work and Industry: Electricity

Data Source

National Museum of American History

Metadata Usage

CC0

Link to Original Record

https://n2t.net/ark:/65665/ng49ca746ab-72d1-704b-e053-15f76fa0b4fa

Record ID

nmah_703422