Bank-notes that Speak.

Kaipara and Waitemata Echo, 4 September 1914, Page 2

Bank-notes that Speak.

Bank-notes that speak are the latest invention of a bank-note expert as a precaution against forgery. The invention has been patented in England, and may be some day adopted when bank officials find themselves the victims of a desperare gang of rogues. The principle of this invention lies in the application to the edge of a bank-note of a "pictorial" record of some specially arranged phrase. A bank-note so provided would, when placed in a phonograph, reproduce this phrase for the bene-, iit: of the bank manager,or the person disputing the genuineness of the note. Assume ..hat the code phrase for a ilt> note is "£5 note." This would be extremely unlikely, but would serve td illustrate the point. A pictorial record of the oscillations produced during; the utterance of the phrase would be made and a die rut capable of reproducing the peculiar wave lines. With this die the edge of £5 notes would be perforated. The note than becomes, in addition to a unit in currency, a phonographic record of its own genuineness.