ðə sˈʌməsˌɛt smˈuːðboːɹ kˈænən wɜː ɹᵻplˈeɪst ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvənti wɪð fˈoːɹ sˈɛvənˈɪntʃ wˈʌnhˈʌndɹɪd ˈeɪɾiˌɛmˈɛm sˈɪks ɐ hˈæftˈʌn mˈʌzəllˈoʊdɪŋ ɹˈaɪfəlz, lˈɑːɹdʒli bɪkˈʌz ʌvðə dˈɪfɪkˌʌlti ɪn wˈɜːkɪŋ ænd kəntɹˈoʊlɪŋ ðə ɡˈʌnz.
The Somerset smoothbore cannon were replaced in 1870 with four 7-inch (180-mm) 6½-ton muzzle-loading rifles, largely because of the difficulty in working and controlling the guns.