orograph

from The Century Dictionary.

• noun A surveyors' instrument designed for military use, to replace the engineers' chain and level. It records on paper an accurate profile of the country over which it is rolled.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Surveying) A machine for use in making topographical maps. It is operated by being pushed across country, and not only records distances, like the perambulator, but also elevations.