The Stockholm Telephone Tower with approximately 5,500 telephone lines, 1890

In the late 19th century, the miracle device called the telephone had been invented but the simple concept of undergrounding telephone cables had eluded engineers. Due to technical limitations of the earliest phone lines, every telephone required its own physical line strung between a house or business to a phone exchange where the call was … Continue reading The Stockholm Telephone Tower with approximately 5,500 telephone lines, 1890