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The reading of the leveling staff in its unchanged position when the leveling instrument has been taken to a new position; a sight directed backwards to a station previously occupied.

Another interesting application relates to the most ancient form of leveling instrument known to us.

John knew what ought to be done, and he could show the soldiers new and better ways of getting results, although he was actually too small to reach the eyepiece of his leveling instrument without the aid of a camp-stool which he carried about with him.

Tom busied himself in picking out the best leveling instrument in camp, while Hazelton secured the rods and a chain.

"Well, then," Tom answered, "you get through here because you kicked one of the tripod legs of your leveling instrument the other day, and left a mark on the wood."