![]() These days it is now known as an octant, the name given to it by its American inventor, Thomas Godfrey. Originally this instrument was referred to as "Hadley's quadrant", after the English inventor. Both men have an equal and legitimate claim to the invention of the octant. The octant was invented in 1730 by Thomas Godfrey, a glazier in Philadelphia, and independently at the same time in England by the mathematician John Hadley, who began work on a similar version of the octant. This allows the instrument to use a one-eighth circle arc to measure a quarter circle or quadrant. It is a type of reflecting instrument that uses mirrors to reflect the path of light to the observer and, in doing so, doubles the angle measured. An octant, also called "reflecting quadrant", is a measuring instrument used primarily in navigation. ![]() Franklin has since been posthumously honored by being inducted into the International Swimming Hall of Fame. Shaped like lily pads or an artist's paint palette, they helped attain greater speed with each stroke. ![]() Contrary to today's version of rubberized swim fins worn on the feet, Franklin's swim fins were originally intended for use on a person's hands. His original design consisted of 10-inch-long (250 mm) and 6-inch-wide (150 mm) palettes. ![]() Benjamin Franklin invented wooden swim fins in 1717. Swim fins are typically made of rubber or plastic. They aid movement in aquatic sports such as swimming, surfing, and underwater diving.
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