'Peter Roget's new device for performing mechanically the involution & evolution of numbers'
the slide rule
19th CENTURY INVENTIONS: Peter Rogets new device for performing mechanically the involution & evolution of numbers
Peter Roget's new device for performing mechanically the involution & evolution of numbers
Peter Roget's new device for performing mechanically the involution & evolution of numbers
19th CENTURY INVENTIONS
the slide rule
19th CENTURY INVENTIONS