Friction Primer

Two copper tubes soldered at right angles to each other. The short tube contains a charge of friction composition surrounding the roughened end of a wire, the outer extremity of which forms a loop for the lanyard; the long tube, for insertion into the vent, is filled with fine powder, retained by a wad of wax. This primer is used for a radial vent; for the axial vent of the field piece, model of 1890, an obturating primer is used.