Calibration Range
In order to calibrate EDM equipment, a monumented base line has been set up along the Frontage Road (Old U.S. 421) on the north-side of Interstate Highway 74, northwest of Pleasant View, Indiana. Located in southeast part of Marion County, Indiana.
The monuments are 42" deep poured concrete with brass tablets in the highway pavement. The monuments were allowed to settle for several months prior to measuring and marking.
Monuments have been established at intervals of 0, 50, 100, 200 and 300 feet, and at 150, 800 and 1400 meters.
Distances were taped using precise procedures with a Lufkin Minvar Low Expansion Tape, Serial No. 2386.
Following is a tabulation of the horizontal measurements and their elevations assuming 100.00 ft. on the 0 monument.
MONUMENT
MEASUREDDISTANCE
ELEVATION OFMONUMENT
0 feet
100.00
50 feet
50.00 feet
100.11
100 feet
100.00 feet
100.31
200 feet
200.00 feet
100.63
300 feet
300.00 feet
100.89
150 meters
492.00 feet
101.18
800 meters
2623.97 feet
103.03
1400 meters
Not measured
119.00