1997 TOP SECRET CODE PAGE
Did you know that it is possible to find
sites without excavating at all??
There are various ways of doing this,
two ways to avoid probing into an
area and damaging artifacts are by using
a proton magnetometer
and soil resistivity meter.
Wow, big words, eh ? See
if you can say that ten times in a row !!
By taking a proton magnetometer over a
site, archaeologists can very
quickly build up an clear map of many
underground archaeological remains.
This instrument works by sending an electrical
current into the ground and
then looking at the changes in the magnetic
field. Strong magnetic fields
are produced by things underground like
buildings. Weak magnetic fields
are found where there are no hidden remains.
Archaeologists have to be careful, however,
because they can
easily be led to a modern sewer system
instead of a real find !!
Soil Resistivity Meter
Soil resistivity makes use of the way
that disturbances in the ground,
such as buildings, pits and ditches make
differing degrees of resistance to
the passage of an electrical current.
The soil above postholes and ditches,
for example, will be drier than undisturbed
soil and so it gives a different
resistance reading (a higher one) than
the rest of the soil around it. BUT,
filled in ditches, pits and postholes
are damper and will give lower resistance than
I know, I know, a bit tricky but, in a
nutshell, these instruments can
let archaeologists "look" underground
without moving anything by
sending down in to the ground certain
types of electrical currents which
can detect buried sites and objects.