(10) Enter the interval between the upper and middle threads and the interval between the middle
and lower threads.
(11) Enter the total interval between the upper and lower threads or the sum of the two half
intervals.
(12) Record the rod number and temperature for the first backsight in each section. If it is found
that the readings of the two thermometers differ, the number of each rod and its temperature should be
recorded, with the reading for the backsight recorded first (specify Centigrade or Fahrenheit).
(13) Record the foresight readings to the nearest 0.001 meter.
(14) Enter the mean of the three thread readings for each foresight.
(15) Enter the reading of the middle thread on the back of the rod to the nearest 0.01 foot.
(16) Perform the procedures as for (10) above, but for the foresight readings.
(17) Perform the procedures as for (11) above. This sum must not differ from the backsight sum
(11) of any one instrument setup by more than 30 intervals (when using a level with a stadia constant of
1/300) or by more than 33 intervals (when using a level with a stadia constant of 1/333). The 30-interval
and 33-interval figures are equivalent to 10 meters of distance (30 x 0.333 = 9.99 or 10 meters; 33 x
0.300 = 9.9 or 10 meters).
(18) Enter any other pertinent information in this column.
(19) Enter the sum of the mean thread readings continuously for columns (8) and (14).
(20) Enter the sum of the back of the rod readings continuously for columns (9) and (15).
(21) Enter the sum of the intervals continuously down columns (11) and (17).
(22) Enter the sum of all backsight readings.
(23) Enter the sum of mean backsight readings.
(24) Enter the sum of the back of rod backsight readings.
(25) Enter the final sum of the backsight thread intervals.
(26) Enter the sum of all foresight rod readings.
EN0593
4-20
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