This whistle calling telephone from 1878 is the oldest piece in the museum. The technology was introduced just two years after Bell had been granted a patent for the telephone in the United States. Siemens & Halske developed a version in which you blew the whistle at the top to produce a sound signal on the other end. You then removed the whistle and spoke into the hole. To listen, you put the hole on your ear. The voice ran along the line, and calling was possible across short distances only.
Photo: Sakari Kiuru