ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvənti wˈʌn ðɪ ˈɔːɹstᵻd skˈeɪl wʌz ɛkstˈɛndᵻd wɪð plˈʌs ænd mˈaɪnəsstˈɛps, ænd nˈuːmɚɹəl vˈæljuːz wɜːɹ ˈædᵻd ɐkˈoːɹdɪŋli.
In 1871 the Ørsted scale was extended with plus and minus-steps, and numeral values were added accordingly.