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The New Scientific Spirit
Bachelard's 1934 inaugural treatise on twentieth-century scientific revolution — the book that established rupture, obstacle, and phenomenotechnique as the core concepts of his epistemology.
Le nouvel esprit scientifique (1934) is Bachelard's first major work in philosophy of science and the foundational text for everything that followed. The book argues that the scientific revolutions of the early twentieth century — relativity, quantum mechanics, non-Euclidean geometry — require a new philosophy of science adequate to their radically novel character. The old empiricism, which treated science as accumulation of observation, cannot account for theories that predict phenomena no previous framework could have imagined. The old rationalism, which treated science as deduction from first principles, cannot account for theories that overthrow the first principles of preceding frameworks. Bachelard proposes a dialectical rationalism: science advances by the interplay between theoretical construction and experimental confrontation, with each transforming the other through ruptures that reorganize what counts as knowledge.
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The book is shorter and more programmatic than Bachelard's later epistemological works, but it established the conceptual vocabulary — rupture, obstacle, phenomenotechnique, applied rationalism — that would structure his