Description of the Pratt Range Board Model of 1905 Mechanical Features And Ru
Description of the Pratt Range Board Model of 1905 Mechanical Features And Ru
United States Army Ordnance Dept
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Clamp the movable clamping device with pointers to the movable bar. Turn the knob of the gear mechanism until the pointer of the movable clamping device is exactly opposite the normal of its set of correction curves. Clamp this mov- able clamping device with pointers to the stationary bar. In like manner set each of the other pointers of the movable clamping devices to the normal of its correction curve and clamp to the stationary bar. When all four pointers of the movable clamping devices are ...at their normals and clamped to the stationary bar, turn the knob until the reading-glass holder support slide with cross wire and reading glass indicates the same range on both the scale graduated on the body and the movable scale. Clamp one outside movable clamping device only to both movable bar and stationary bar, locking the system. OPERATION. 15. Set each curve indicator at its proper correction curve. Set the cross wire with the aid of the reading glass at the range to the set- forward point on the scale graduated on the body.
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