Mason-Dixon Line Crownstone

The North-South line between the colonies of Maryland and Pennsylvania, now Delaware, was surveyed between June and September 1764 by Charles Mason, an astronomer, and Jeremiah Dixon, a mathematician and surveyor.

Leading a party of thirty-nine, Mason and Dixon measured off ...

Mason-Dixon Crownstone

Responsible for marking the boundaries of Maryland and Pennsylvania (including the "Three Lower Counties" of Delaware), Mason and Dixon began their survey of the North-South or Tangent Line at the southwestern corner of present-day Delaware in June 1764. Proceeding northward, ...