The following data is extracted from Fitzwilliam, Cheshire County, New Hampshire History.
Isaac Davis, a native of Royalston, Vt., and brought up at Princeton, Mass., came here March 11, 1839. He is a blacksmith by trade, and, in 1877, invented the compound force cartridge, which he patented the same year. It is intended for shooting long distances, and the principal has been acted upon for heavy ordinances for piercing iron-clad vessels. By dividing the charge of powder great accumulative force is gained.
Source: Fitzwilliam, Cheshire County, New Hampshire History