The Royal Society meeting on February 5 discussed the theory of relativity. Mr. J. H. Jeans compared it to a ward in a lock, directing efforts to open it. He likened it to the conservation of energy and the second law of thermodynamics. Einstein's 1905 hypothesis that light's velocity is constant for all observers, based on the Michelson-Morley experiment, formed the theory's foundation. It explained physical phenomena and visualized space-time as a four-dimensional continuum. A spherical wave-surface transforms under rotation, mixing time and space. An example showed a man's life and travel distance appearing different to a distant observer. This concept was preferred over Lorentz contraction, which had issues with rotating wheels. Jeans compared relativity to cave-dwelling people discovering Earth's rotation through experiments. Einstein's theory explained Mercury's perihelion shift without arbitrary constants. The theory's law of gravitation involved no force, with motion laws in simple form. Space-time could be explored via clocks, scales, or moving particles. The spectral shift, due to time dilation, was a key test. Mercury's perihelion shift was explained by Einstein's theory, while other effects like Venus's node were minor. Prof. Fowler discussed redshift in the sun's spectrum, attributing it to convection currents. Mr. Cunningham showed that spectral shift could occur without gravity. Prof. Lindemann noted the recession of B-stars, possibly due to Einstein's effect. Prof. Whitehead proposed a mathematical method to satisfy Einstein's predictions without time as a fourth dimension. The flight from Cairo to the Cape discussed air travel's advantages over railways and ships, though it was more dangerous and expensive. Air travel was faster for urgent mail, but less so for goods. Sea travel was cheapest, while railways were more economical in remote areas. The meeting concluded that air travel would be valuable for urgent transport, though not for general travel.The Royal Society meeting on February 5 discussed the theory of relativity. Mr. J. H. Jeans compared it to a ward in a lock, directing efforts to open it. He likened it to the conservation of energy and the second law of thermodynamics. Einstein's 1905 hypothesis that light's velocity is constant for all observers, based on the Michelson-Morley experiment, formed the theory's foundation. It explained physical phenomena and visualized space-time as a four-dimensional continuum. A spherical wave-surface transforms under rotation, mixing time and space. An example showed a man's life and travel distance appearing different to a distant observer. This concept was preferred over Lorentz contraction, which had issues with rotating wheels. Jeans compared relativity to cave-dwelling people discovering Earth's rotation through experiments. Einstein's theory explained Mercury's perihelion shift without arbitrary constants. The theory's law of gravitation involved no force, with motion laws in simple form. Space-time could be explored via clocks, scales, or moving particles. The spectral shift, due to time dilation, was a key test. Mercury's perihelion shift was explained by Einstein's theory, while other effects like Venus's node were minor. Prof. Fowler discussed redshift in the sun's spectrum, attributing it to convection currents. Mr. Cunningham showed that spectral shift could occur without gravity. Prof. Lindemann noted the recession of B-stars, possibly due to Einstein's effect. Prof. Whitehead proposed a mathematical method to satisfy Einstein's predictions without time as a fourth dimension. The flight from Cairo to the Cape discussed air travel's advantages over railways and ships, though it was more dangerous and expensive. Air travel was faster for urgent mail, but less so for goods. Sea travel was cheapest, while railways were more economical in remote areas. The meeting concluded that air travel would be valuable for urgent transport, though not for general travel.