In the twentieth century, meter became an object of disdain, reimagined as an automated metronome to be transcended by new rhythmic practices of free verse. Yet meter remained in the archives, poems, letters, and pedagogy of modern poets and critics. In Modernism's Metronome, Ben Glaser revisits early twentieth-century poetics to uncover a wide range of metrical practice and theory, upending our inherited story about the "breaking" of meter and rise of free verse.