levelage

The act or process of leveling.

Since connection was made by levelage with German main shaft, a large body of ore has been opened which is being backstoped.^([sic])

The entire group can be worked by a system of levelage and cross-cuts from the workings of the main shaft on the Columbia Avenue.

The measured level of something.

The surface of Lake Erie has generally been considered as five hundred and sixty-four feet above tide-water at Albany; see the Report of Michigan, 1839-40. The topographer of that State, S.W. Higgins, Esq., puts it at 565, 333 feet. If this last number represents the levelage of the Erie Canal, it is probably good for the surface of the Lake, as it was when the surveys were made for that work, twenty-five years since.

The little instrument and methods which I shall describe can be applied in any of our American laboratories, either in the recumbent posture, which I believe is the most popular, or it can be used in the vertical position, because the instrument will give an accurate levelage of the skull in any position.