Postman rings twice

[sagehen]

As one who does remember the 40's (& 30's, too, for that matter), I can say
that in Lincoln Nebraska, at least, the postman on our route (Mr. Beggs)
neither rang nor knocked, but simply put the mail through the letter slot.
What he DID do twice, was deliver the mail each day.  There were both
morning and afternoon deliveries in those days.   The second delivery was
stopped sometime during the war.
A. Murie