Yesterday's surveyors marked boundaries
with wooden posts, stones, concrete, steel bars, pipes and aluminum.

Today's surveyors choose
HARRISON'S 21st century technology.

PERMANENT*
They are cast iron-the proven metal.
(They don't disintegrate under ground like aluminum or wood.)
*Cast iron buried 300 years ago is still intact. Only the passage
of centuries will show the full extent of its lasting durability.

STABLE
They are secure in all soils. They resist side
and pull-out thrusts. If accidentially struck, the top cracks off.
The bottom maintains its position.

MAGNETIC
They are easily located. Even a HARRISON'S depth
is no problem. A dip-needle or an electronic sensing
device responds emphatically.

ECONOMICAL
Cast iron is abundant and low in cost.