ɪnðə wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti z ɹˈæpɪd tʃˈeɪndʒᵻz wɜː tˈeɪkɪŋ plˈeɪs ɪnðə tɛknˈɑːlədʒi ʌv ˈɑːɹməmənt pɹədˈʌkʃən, ænd kˈælɪbɚz wɜːɹ ɪŋkɹˈiːsɪŋ baɪ ɐbˌaʊt ɐn ˈɪntʃ pɜː jˈɪɹ.
In the 1860s rapid changes were taking place in the technology of armament production, and calibres were increasing by about an inch per year.