Fantastic original vintage glossy 11.75 x 9.25 silver gelatin photo of the first Solvay Conference, captioned "Conseil de Physique Solvay, Bruxelles 1911," depicting the famous attendees at the Hotel Metropole, including: Ernest Solvay, Albert Einstein, Hendrik Lorentz, Henri Poincaré, Marie Curie, Max Planck, Ernest Rutherford, and others. AGFA watermarks on the reverse date the photo to circa 1924. In fine condition, with a light bend to the lower right border. Hosted in Brussels in the autumn of 1911, the historic first Solvay Conference convened on the subject of 'the theory of radiation and quanta.' The success of the conference led Belgian industrialist Ernest Solvay to found the International Solvay Institutes for Physics and Chemistry, which continues to host series of conferences and workshops that bring together renowned scientists. The establishment of these historic conferences is considered a turning point in the history of physics.