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Bell’s diaphragm telephone

In June 1876, Alexander Graham Bell and his assistant Thomas Watson showed telephones at the U.S. Centennial Exposition in Philadelphia. A U.S. Supreme Court report on the telephone patent cases says that two magneto telephones with diaphragm membranes were used in the public test on June 25. This was about 11 years after the Paris–Lyon commercial pantelegraph service began in 1865. “About ten years” is a reasonable rounding, but not the exact interval. [1–3]

AI-згенерована синтетична музейна ілюстрація (бонус, остання в порядку); не фото конкретного артефакту. Prompt: “Editorial museum-style illustration of Alexander Graham Bell's 1876 early telephone transmitter and receiver with thin vibrating diaphragms, two instruments connected by a wire, subtle Centennial Exposition context, accurate 19th-century brass and wood construction, muted archival colors, educational diagram-like composition, no readable labels, clearly an illustration and not a historical photograph.”

AI-згенерована синтетична музейна ілюстрація (бонус, остання в порядку); не фото конкретного артефакту. Prompt: “Editorial museum-style illustration of Alexander Graham Bell's 1876 early telephone transmitter and receiver with thin vibrating diaphragms, two instruments connected by a wire, subtle Centennial Exposition context, accurate 19th-century brass and wood construction, muted archival colors, educational diagram-like composition, no readable labels, clearly an illustration and not a historical photograph.”