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Magnetometer
Gradiometer

Sweden's hidden forgotten history.

The Grad 601 is a Fluxgate Gradiometer. It measures small variations in the earth's magnetic field. These variations are the result of changes to the magnetic characteristics of the soil and are often the result of human activity in the past.

In economic terms, the Grad 601 is the ideal tool to determine if an area may be of historical significance before development takes place. If this is the case, the development can be modified, moved or cancelled before large and expensive excavations are begun.

The Grad 601 is primarily a tool for the archaeologist. It provides them with advance knowledge of what is to be expected below the surface. This makes it easier to localize archaeological remains and avoid numerous random test pits which may miss a lot of the archaeology anyway.

This method does not in any way replace the archaeologist. Instead can be a very important aid for him/her to be able to form an opinion of what and where important ancient remains may be located.

An area of about 1 hectare can be covered with the Grad 601/1 in a day, and 2 - 2,5 hectare with the Grad 601/2. However this may be reduced by circumstances in the field and time of year. The instruments do not require perfectly flat or completely obstacle free terrain making them very versatile.

The Grad 601 is a brand new type of equipment and we at SAGA are the first to use it here in Sweden. As our experience increases we will become more skilled at interpreting the survey results. However already today we have a high level of certainty when it comes to telling if the results are modern remains or if it is ancient archaeology.

When looking at the results you should not concern yourself with the technical aspects of resolution, etc. In most cases the survey results will speak for themselves. Where the purpose of the survey is only to determine if a proposed building needs to be moved or modified the answer will be often be obvious. Excavations can be avoided, the only question left to you is what changes need to be made to the plans.

The survey results at the top of the page show an area of about 4,6 hectare. Three linked circles can be easily seen on the right-hand side that look like, and are the right size for, grave rings. But how can that be proved? Inventories made in the 1700's verify the presence of 3 grave rings at this location. However they are not included in the Ancient Remains Registry. By combining the survey results with historical information you can determine with a high degree of probability, what is revealed by the survey. With experience and some imagination, we can also locate the following:

Modern artifacts
Road, telephone cables, water pipes, filled ravine, owner shift lines, and ditches.

Geological phenomena
Brook lines, Old shoreline, Mountain and earlier water damaged areas.

Archaeology
Three grave rings, larger grave area, settlement area, old road, a possible iron manufacturing location and well.

This is an interpretation of this survey but it is pure speculation and CAN ONLY BE VERIFIED BY AN ARCHAEOLOGIST EXCAVATING THE AREA.

The survey seen above is on arable land and nothing that is seen on the map is visible on the surface except the road.

Click on the pictures for a bigger version.

Glenn Envall with Grad 601/1
Glenn Envall with Grad 601/2

 

 

 
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