baɪ ɐnˈælədʒi wɪð stˈiːm pɹˈɛʃɚ ˈiːkwəlz ðə nˈiːd fɔːɹ wˈɜːk, ðɪ ɛnˈæktmənt əvə fɹˈiː lˈænd lˈɔː, ɪt wʌz bᵻlˈiːvd, wʊd ˈækt æz ɐ sˈeɪfti vˈælv.
By analogy with steam pressure (= the need for work), the enactment of a free land law, it was believed, would act as a safety valve.