The difference between these two readings was six feet and one inch, showing that, for the distance between first and second stakes the rise in the hillside was six feet one inch.

Thereupon Reade turned and sighted, from stake number two to stake number three, noting in his book the reading he secured from the rod at number three.

Once at number three he turned his telescope backward, taking a reading from Trotter's rod at number two.

Ten stakes were thus covered, and not only were the foresights and backsights read and recorded, but the distance between each pair of stakes was measured with the chain and the distances entered on the record.
At stake number ten Tom halted.
"Harry," he directed, "you take Black's leveling notes and hold them while I read my own notes.

Stop me every time that you note a difference between the two records." After that Harry steadily stopped his chum at every reading.
By the time that they had finished the comparisons Hazelton's face looked blank from sheer astonishment.
"Why, every single one of Blacks foresights and backsights is wrong!" gasped Harry.