![](https://paw.princeton.edu/sites/default/files/styles/feature_image/public/images/content/LIVE.FTA040208.jpg?itok=FMpScqg-)
Princeton University Archives
![](https://paw.princeton.edu/sites/default/files/styles/feature_image/public/images/content/LIVE.FTA040208.jpg?itok=FMpScqg-)
Princeton University Archives
The late Elwin Salter ’39 uses an early version of the hands-free headset in this undated photo. Salter was a night phone operator at the University exchange, according to archivists. Princeton’s telephone switchboard was located at 20 Nassau St., now the site of a retail dancewear shop