Whispering Jack

The two who sat at a table in an obscure corner of the room were the noted burglars "Whispering Jack" and "Jim the Cracksman," as they were nick-named by their associates.

1879 Jan., "A Night with Burglars" in Gleason's Monthly Companion, vol. 8, no. 1, p. 281 (Google preview)

[T]he microphone enabled a Whispering Jack Smith to make a rhythmic mumble pass for singing and gave Bing Crosby a means of taking advantage of his casual, intimate style.

1981 March 8, John S. Wilson, “Barbara Cook—Pop and Polish”, in New York Times, retrieved 27 Jul 2014

Case 3 Whispering Jack: Jack was a quiet and perceptive young man who was well respected by his peers.

2002, J. John Loughran, Developing Reflective Practice, →ISBN, page 136

Under the lone operating streetlight, Whispering Jack comes into full view. . . . In his usual low tone, . . . Jack speaks in the manner that earned him his nickname.

2004, Ray Scott, Street Justice, →ISBN, page 55

Whispering Jack Reddington graduated from the Colorado School of Mines in 1899 and began his career as a mining engineer. His real passion however, was the transmission and amplification of sound waves.

c. 2009, B. J. Sears, “Reddington's Phonelescope”, in Professor Sears' Technological Rarities, retrieved 27 Jul 2014