Reversed Speech
Edward W. Kellogg · The Journal of the Acoustical Society of America · 1939
Recording sound and then reproducing it with the rotation of the record reversed is not only a means of amusement, but serves to throw some light on our habits of speech, particularly if one tries reversing the order of the original pronunciation, so that the reproduced sound may be actual words. Some of the writer's observations are given in the paper.