ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪkstiːn kˈoʊlt ˌɛndʒɪnˈɪɹ dʒˈɔːɹdʒ tˈænsli ɪnvˈɛntᵻd ɐ θˈɜːd sˈeɪfti fˈiːtʃɚ fɚðə pˈɪstəl, ðə mˌæɡɐzˈiːn sˈeɪfti dɪskənˈɛktɚ, wˌɪtʃ pɹɪvˈɛntᵻd ˌæksɪdˈɛntəl fˈaɪɚɹɪŋ wɪððə mˌæɡɐzˈiːn ɹᵻmˈuːvd.
In 1916 Colt engineer George Tansley invented a third safety feature for the pistol, the magazine safety disconnector, which prevented accidental firing with the magazine removed.