Can any one reccomend a company who hire out magnetometers, or sell used ones ?. Preferably in Essex, Suffolk or North London areas.
I hope to be able to follow up a couple of old rumours/leads later this year, & will need one of these to check them out.
Cheer’s.
Bob T.
By: sopwith.7f1 - 26th February 2013 at 12:08
Hope its not more buried Spits. Aaaarrrrgggg![/QUOTE]
NO not Spits, but possibly chunks of Henley, Hurricane & Battle etc.
The story for one site goes- After WW2, due to it’s location, any aircraft etc that couldn’t be made airworthy & flown away from the airfield, were bulldozed into the ground near the hangars.
Probably nothing to it, but worth spending a little time etc on, just incase.
Bob T.
By: sopwith.7f1 - 25th February 2013 at 11:19
Many thanks for the replies, I’ll check out your suggestions, & see how I get on.
The sites I want to investigate, are rumoured dumps/burial places. The aim is to use a magnetometer to discover IF anything is buried at these sites, & then try & arrange a dig IF anything is indicated as being there.
Bob T.
By: Ross_McNeill - 24th February 2013 at 13:44
The Barrington is usually too sensitive for locating ferrous aircraft parts.
All the magnetometers work on the same basis.
Heat some ferrous material over 600/700 deg c (vulcanising) and when it cools it takes up and “fixes” the magnetic flux pattern of the place it cools into it’s structure.
The Barrington and other geophysics devices are looking for the soils in the vicinity of a fire x 100 years ago and so are set up to measure and display as full scale the magnetic deviation from when the soils were heated at the the time to the rest of the immediate surrounds now (fractions of nT).
This will only help in an aircraft recovery if the parts were on fierce fire when or shortly after the crash.
Foerster etc, bomb locators work on the assumption that the previously forged ferrous parts retained their vulcanising magnetic flux arrangement and they now are lying at an angle to the surrounding magnetic flux lines giving a significant local magnetic deviation (10s of nT).
They will not be densed in measurement scale as the Barrington type.
For a crash site without subsequent fire I would go with the bomb locator. For one where the aircraft burnt on the ground or a fire dump I would choose the geophysical device but expect to have a wide spread of natural as well as man made hits.
Personally i’ve had better results (shallow depth) from this device
http://www.schonstedt.com/index.cfm?page=GA-52Cx
than the ex military Foerster (but this excels at depth)
Final caution – any magnets on site (from compass correctors or meters) will give results the same as a dump full of crated merlins while a whole aluminium airframe will be invisible to any magnetometer.
Regards
Ross
By: Junk Collector - 24th February 2013 at 13:20
Germany
Look on German Ebay, they turn up there and shipping from Germany is quite cheap, around 25 – 30 Euro, Vallons are common, and older Foersters. Newer Foersters attract a high price, although these are just basic things for pinpointing with.
There were some over here but they were of dubious quality and faulty, I used one that kept shutting off all the time. I got an older style Foerster from Sweden which was in as new condition at a good price.It has a few kill marks on its box now, hopefully a few more to come as well.
Ground penetrating radar hire if thats what you are after i think would be pretty expensive.
By: Resmoroh - 24th February 2013 at 13:19
Bob, Hi,
Most of the Uni Archaeology Depts have a number of these gizmos. Talk nicely to them and you might even get given a couple of students to do the “donkey work” for their Dissertations?!!!!!!!!!!!!!!!!!!! Not, perhaps, the full Time Team bit, but mutual backscratching!
HTH
Resmoroh
By: Bombgone - 24th February 2013 at 13:08
You may have done a Google Just found this hope it helps.
Hope its not more buried Spits. Aaaarrrrgggg!
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February 24, 2013 at 11:30 am