Elisa

The 1900´s

The 1900s

Operators in manual exchanges to connect calls

The office building, designed by architect Lars Sonck and made of grey and red granite, was completed in the autumn of 1905. The telephone exchange with its operators moved to Korkeavuorenkatu in February 1907. The first telephones were connected through wires to the telephone exchange, where operators connected the lines manually.

The year 1906 saw the invention the invention of the electron tube. The invention was a giant leap in voice transmission technology. New audio frequency amplifiers achieved better audibility in long distances. Electron tubes also enabled the adoption of carrier wave technology. Several simultaneous calls could take place on the same wire. Finland implemented the carrier wave system in 1922 as the first one of the Nordic countries.

In 1900, there were 2,655,900 citizens in Finland. The rapid growth in the amount of inhabitants of Helsinki increased the demand for the telephone: there were already 9,000 subscribers.

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