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Timeline of united states inventions (before 1890)Timeline of united states inventions (before 1890)Timeline of united states inventions (before 1890)







  • Timeline of united states inventions (before 1890)

    An octant, also called "reflecting quadrant", is a measuring instrument used primarily in navigation.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. this allows the instrument to use a one-eighth circle arc to measure a quarter circle or quadrant.

  • Timeline of united states inventions (before 1890)

    An octant, also called "reflecting quadrant", is a measuring instrument used primarily in navigation.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. this allows the instrument to use a one-eighth circle arc to measure a quarter circle or quadrant.

  • Timeline of united states inventions (before 1890)

    In 1641, the first patent in north america was issued to samuel winslow by the general court of massachusetts for a new method of making salt. on april 10, 1790, president george washington signed the patent act of 1790 (1 stat. 109) into law proclaiming that patents were to be authorized for "any useful art, manufacture, engine, machine, or device, or any improvement therein not before known ...