The lecture on the structure of metals, primarily as observed under a microscope, covered several key aspects. It began with the early application of microscopy to metallic structures by Dr. H. Sorby in 1864, followed by significant advancements in recent years. The lecturer highlighted the work of Cambridge researchers such as Rosenhain, Humphrey, Neville, and Heycock, who made substantial contributions to the field. The lecture detailed the structure of metal grains, their formation, and the effects of stress and fatigue. It also discussed the behavior of alloys, particularly binary alloys, and the formation of eutectic mixtures. The importance of iron and carbon in steel alloys was emphasized, along with the process of quenching and the evolution of heat during transformation. The lecture concluded with a comparison between the granular structure of glacier ice and metals, illustrating the continuous structural changes that occur over time.The lecture on the structure of metals, primarily as observed under a microscope, covered several key aspects. It began with the early application of microscopy to metallic structures by Dr. H. Sorby in 1864, followed by significant advancements in recent years. The lecturer highlighted the work of Cambridge researchers such as Rosenhain, Humphrey, Neville, and Heycock, who made substantial contributions to the field. The lecture detailed the structure of metal grains, their formation, and the effects of stress and fatigue. It also discussed the behavior of alloys, particularly binary alloys, and the formation of eutectic mixtures. The importance of iron and carbon in steel alloys was emphasized, along with the process of quenching and the evolution of heat during transformation. The lecture concluded with a comparison between the granular structure of glacier ice and metals, illustrating the continuous structural changes that occur over time.