[BC] question for you engineers, take 2

[Donna Halper]

So I just found an article from late January 1929 (!) that says phone 
calls were put on the air from station KSTP in St. Paul MN, by means 
of "a special telephone-microphone pick-up."  The photo shows an 
announcer, identified as Jack Little, talking into an old-style phone 
with that candlestick style (there's a name for that type of phone, 
but I don't recall it) .  There is a microphone, but it's next to the 
other announcer on the show, Harry Giese.  The photo could certainly 
have been staged (the story comes from the Associated Press), but it 
describes how during the show, the announcers asked if people were 
listening from a long distance, invited them to call, and a guy from 
Texas did so, whereupon his call was put on the air.  So, the 
suggestions you good folks offered about how America's Town Meeting 
of the Air might have put callers on the air live... that was in 
1935.  Would the same process have been possible for telephones in 
the late 1920s?