I found these earphones at local flee market. They were $20. They were made by Schwarze Electric in Detroit circa 1923. I got them working with a minor repairs. I tried to attach cotton lamp cord. This did not work out so there they are with modern earphone wire. At least with this arrangement I can unplug them. These earphones are of a 3000 ohm high impedance design. The voice coil goes over a fixed magnet. The magnet operates on a thin steel armature with no electrical connections on it. The sound is very tinny and awfull The Radiola III actually sounds much better with modern low impedance earphones. There I am hoping to live to see the upcoming modern age of the low impedance high fidelity loud speaker.
When you find something like this from the incipient age of electrical communication and get it working, you realize how short of a time that our modern electrical age has existed. Frank Znidarsic http://www.angelfire.com/scifi2/zpt/temp/OutOf1923.jpg
