ɪn wˈʌn θˈaʊzənd fˈaɪvhˈʌndɹɪd sˈɛvənti θɹˈiː sˈæmjuːl zˈɪmɚmən dɪvˈaɪzd ɐn ɪmpɹˈuːvd mˈɛθəd wˌɪtʃ ɪŋkˈoːɹpɚɹˌeɪɾᵻd ɐ snˈæfæns ɔːɹ lˈeɪɾɚ, flˈɪntlɑːk mˈɛkənˌɪzəm ˌɪntʊ ðə tʃˈɑːɹdʒ ænd kənˈɛktᵻd ɪts tɹˈɪɡɚ tə ðə sˈɜːfɪs wɪð ɐ wˈaɪɚ.
In 1573 Samuel Zimmermann devised an improved method which incorporated a snaphance (or later, flintlock mechanism) into the charge and connected its trigger to the surface with a wire.