Invented in 1921, the Hush-A-Phone was advertised as a “telephone silencer” and a device that “Makes your phone private as a booth.”
It produced the same effect as cupping both your hands around the mouthpiece of the two-pieced candlestick model telephone, with others in the room only hearing a rumbling of indiscernible sounds.
Callers only needed to slide the Hush-A-Phone over the mouthpiece of the phone, place their lips in the circular opening, and speak. The device was simple, easy to use, and it worked.
Yet, the Hush-A-Phone isn’t remembered for its simplicity, or success in creating an artificial cone of silence. Rather, the device is known for waging a war against the telecommunication giant, AT&T—a historic legal battle law experts compare to feuds over today’s open internet. more
Predating the Hush-A-Phone by about 20 years was The Whispering Mouthpiece. ~Kevin