What is "contact level"

Contact \Con"tact\ (k[o^]n"t[a^]kt), n. [L. contactus, fr. contingere, -tactum, to touch on all sides. See Contingent.]

1. A close union or junction of bodies; a touching or meeting.

2. (Geom.) The property of two curves, or surfaces, which meet, and at the point of meeting have a common direction.

3. (Mining) The plane between two adjacent bodies of dissimilar rock.
   --Raymond.

4. (Electricity) A metallic conducting component of an electrical device connected to a circuit within and so situated that it may form a conducting pathway to an external power source or device when contacted by another conductor; as, the contact on a standard light bulb has the shape of a screw for easy insertion into the socket.

5. A person who serves to commmunicate information to or from one group to another, whether formally or informally; as, a good Washington reporter has contacts in the White House.

   Contact level, a delicate level so pivoted as to tilt when two parts of a measuring apparatus come into contact with each other; -- used in precise determinations of lengths and in the accurate graduation of instruments.

n. A delicate level pivoted so as to tilt when two parts of a measuring apparatus come into contact with each other; used in precise determinations of lengths and in the accurate graduation of instruments.