industrial manual turntable suction sandblasting cabinet price in mexico


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.