The period elevated neutron-induced fission from a theoretical curiosity to a practical process, guided by models linking deformation and surface energy to fission barriers and cross-sections. Early measurements quantified neutrons released per fission, establishing the feasibility of a self-sustaining chain reaction and informing initial reactor calculations. Research integrated rapid experiments on yields and decay characteristics with evolving theory, forging a direct bridge from fundamental physics to engineering applications. Historical Significance: Together, these data and models codified a paradigm that shaped later reactor design, fuel-cycle planning, and radiochemical analysis. By converting a fundamental nuclear process into an engineering-ready framework, researchers established the groundwork for the scalable, controlled use of nuclear energy and materials in subsequent decades. The integration of theory and measurement during this period continues to underpin modern nuclear engineering and related radiochemical disciplines.