The Science Museum in South Kensington has opened a geophysical exhibition and published a handbook that provides a historical overview and introduction to applied geophysics. This initiative is significant as it promotes the growing recognition of geophysical methods in Britain. The exhibition showcases geophysical prospecting, instruments, and practical problems addressed by these methods. The handbook details four main geophysical methods: magnetic, gravimetric, seismic, and electrical. It includes a historical account and explanations of the physical principles behind these methods. The handbook also addresses misconceptions, such as the connection between geophysical exploration and the divining rod, which is described as an unscientific device. The physical properties underlying these methods include magnetic susceptibility, density, elasticity, and electrical conductivity. The magnetic, gravimetric, and seismic methods are explained, with the seismic method using explosive charges to detect underground structures. The handbook also describes modern instruments used in geophysical surveys, such as the Schmidt vertical variometer and gravity gradiometer. These instruments are important for detecting subtle variations in the earth's magnetic and gravitational fields. The exhibition includes various exhibits, some of which are modern instruments not previously seen in public. The Imperial Geophysical Experimental Survey in Australia tested these methods under various conditions, leading to the publication of a report on geophysical prospecting. The handbook also discusses the development of geophysical methods, noting that while their theoretical foundations are largely due to British research, their practical applications have been largely developed by foreign enterprises. The Science Museum's exhibition and handbook aim to promote the development of applied geophysics in Britain. The article also discusses ultra-penetrating rays, a high-penetrability radiation discovered by Hess and Kolhörster, which is believed to have cosmic origins. The nature of this radiation remains uncertain, but recent experiments using pressure chambers and electron counters have provided new insights into its properties.The Science Museum in South Kensington has opened a geophysical exhibition and published a handbook that provides a historical overview and introduction to applied geophysics. This initiative is significant as it promotes the growing recognition of geophysical methods in Britain. The exhibition showcases geophysical prospecting, instruments, and practical problems addressed by these methods. The handbook details four main geophysical methods: magnetic, gravimetric, seismic, and electrical. It includes a historical account and explanations of the physical principles behind these methods. The handbook also addresses misconceptions, such as the connection between geophysical exploration and the divining rod, which is described as an unscientific device. The physical properties underlying these methods include magnetic susceptibility, density, elasticity, and electrical conductivity. The magnetic, gravimetric, and seismic methods are explained, with the seismic method using explosive charges to detect underground structures. The handbook also describes modern instruments used in geophysical surveys, such as the Schmidt vertical variometer and gravity gradiometer. These instruments are important for detecting subtle variations in the earth's magnetic and gravitational fields. The exhibition includes various exhibits, some of which are modern instruments not previously seen in public. The Imperial Geophysical Experimental Survey in Australia tested these methods under various conditions, leading to the publication of a report on geophysical prospecting. The handbook also discusses the development of geophysical methods, noting that while their theoretical foundations are largely due to British research, their practical applications have been largely developed by foreign enterprises. The Science Museum's exhibition and handbook aim to promote the development of applied geophysics in Britain. The article also discusses ultra-penetrating rays, a high-penetrability radiation discovered by Hess and Kolhörster, which is believed to have cosmic origins. The nature of this radiation remains uncertain, but recent experiments using pressure chambers and electron counters have provided new insights into its properties.