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"I'm a fairly visual thinker. In doing science, I think in terms of pictures of things happening, and then do the mathematics."
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Robert Heinlein did not invent the term "hush-a-phone" - but he did expand on the original device with futuristic attachments.
The original Hush-a-Phone was first manufactured and sold in 1921. It was a very simple device that provided privacy, avoided annoying other people and helped you hear better. It had versions for pedestal phones as well as those new-fangled handsets. It was a very simple device that just slipped onto the phone; it had no moving parts or electrical components.
Heinlein, however, has added some improvements. The rubber mask improves noise suppression; the bone-conduction receiver means that none of the other person's part of the conversation ever goes out in the open air.
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