Further modifications of its burning rate were achieved by shaping the powder grains into prismatic shapes, typically single-perforated hexagonal or octagonal prisms.
fˈɜːðɚ mˌɑːdɪfɪkˈeɪʃənz ʌv ɪts bˈɜːnɪŋ ɹˈeɪt wɜːɹ ɐtʃˈiːvd baɪ ʃˈeɪpɪŋ ðə pˈaʊdɚ ɡɹˈeɪnz ˌɪntʊ pɹɪsmˈæɾɪk ʃˈeɪps, tˈɪpɪkli sˈɪŋɡəlpˈɜːfɚɹˌeɪɾᵻd hˈɛksɐɡənəl ɔːɹ ˈɑːktɐɡənəl pɹˈɪzəmz.