This 'harmonica pistol' is up for sale at the Hermann Historica auction house. Barmy design when compared to eg. the revolver...

It makes you think about airguns, particularly how the Certus and Parker 'Precision' were presumably hoped to be 'the next big thing' by their inventors/makers, who invested money into their manufacture.

But then as history showed, the simplicity and brilliance of the Johnstone & Fearn patent Webley design destroyed the commercial prospects of most other air pistols, in a design that persisted for many decades. The Certus was actually patented several years after the Webley and appears to be based on it, to some extent.