Speaking tubes - residential

I have the interior speaking tube whistle but would like more, as this one appears not to whistle. I also lack one for the front door.
Lonnie    lonniechu at gmail dot com
About speaking tubes (Wikipedia)





Mailboxes sold on eBay (top)
A mouthpiece at entry door of house similar to mine in my neighborhood (bottom)




The following are in .pdf format -
you'll need Adobe or Foxit Reader.

Speaking Tube Supplies

Patent lawsuit including speaking tube specs (to a degree)

Ferryboat Confession: story published in NY Times, 1900





Speaking tube whistle still in its wall in a home in San Francisco














  Three whistles in a row - communicated with three different locations in this large house.


Last updated February 7, 2009   lonniechu at gmail dot com