During the percussion period saw many gun makers come up with different patents to improve and quicken the percussion ignition two examples known has the centre fire system were by makers Bentleys of Liverpool and James Rowntree of Barnard Castle UK Both patents directed the cap ignition straight to the main powder charge by a straight flash hole and not like the the ordinary percussion on which the flash channel is angled to the left or right side of the nipple housing Enclosed are a couple of images showing this patent
Feltwad
Rowntree
patent
Bentleys Patent
Feltwad
Rowntree
Bentleys Patent