Belgian Percussion Eprouvette

    This contraption is a Belgian Percussion Eprouvette. Back in the days when blackpowder was of dubious quality, devices like these were used to test the potency of the powder at hand. The barrel plug is attached to a V shaped spring. When fired the spring compresses moving a slider. The strength can then be read off a scale. I am not if the units on the scale correspond to the energy of the powder, or if it is just used for comparative purposes.

    This particular Percussion Eprouvette is housed in the National Firearms Museum’s Robert E. Petersen gallery.

    [ Many thanks to Nic Jenzen-Jones for emailing us the link. ]

    Steve Johnson

    I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!