Patent ID: 6467183
Filing Date: 2002-10-22
Classification: G01B

Abstract:
An instrument for measuring distances comprising:a rule having a whole unit scale; primary fractional graduations dividing said whole units by multiples of two into halves, quarters and eighths; secondary graduations dividing said rule; an adjustable body which is movable with respect to said rule; first vernier index graduations affixed to said adjustable body adjacent to said primary fractional graduations for subdividing said primary fractional graduations into equal first vernier index graduations, said first vernier index graduations, when added to a decimal equivalent of said primary fractional graduations, dividing said whole units into precise five-thousandths of said whole units; second vernier index graduations affixed to said adjustable body adjacent to said secondary rule graduations for subdividing said secondary rule graduations into equal second vernier index graduations, said second vernier index graduations further dividing said first vernier index graduations into precise one-thousandths of said whole units; wherein alignment of one of said first vernier index graduations with an adjacent primary fractional graduation designates a decimal division of said primary fractional graduation into five-thousandths of said whole units without interpolation and alignment of one of said second vernier index graduations with an adjacent secondary graduation designates one-thousandths of said whole units of measurement without interpolation.