The Library of Congress has digitized and made available online Alexander Graham Bell’s sketchbook of ideas. Above is a sketch of his telephone system.
The books are a priceless treasure of an incredibly fertile mind working through one of the most exciting periods of technological innovation in the history of the world. The sketches, though, are more than just dry recordings of physical principles. Bell’s drawings are expressive in ways that few technical sketches are. Little flourishes and annotations make paging through his drawings a delight.
Story: The Atlantic | Photo: Library of Congress