ɪt kəmpɹˈaɪzd ɐn ɛkstˈɜːnəl kˈeɪsɪŋ, jˈuːʒuːəli ʌv kˈæst ˈaɪɚn, fˈɪld wɪð ɐ hˈaɪli flˈæməbəl mˈɪkstʃɚ, ænd hˌævɪŋ θɹˈiː tə fˈaɪv hˈoʊlz θɹuː wˌɪtʃ ðə bˈɜːnɪŋ fˈɪlɪŋ kʊd blˈeɪz ˈaʊtwɚd.
It comprised an external casing, usually of cast iron, filled with a highly flammable mixture, and having three to five holes through which the burning filling could blaze outward.