By John Oswin

ISBN-10: 354076691X

ISBN-13: 9783540766919

ISBN-10: 3540766928

ISBN-13: 9783540766926

This targeted paintings examines the technology of geophysics operations in archaeology and provides non-specialist scholars either the arrogance and the competence to establish and perform their very own surveys.

A box consultant to Geophysics in Archaeology

• explains the procedures considering transparent and obtainable language;

• provides a step by step advisor to developing and conducting a survey;

• demonstrates the appliance of technology to instruments;

• supplies examples of result of surveys and indicates the way to interpret

them;

• explains soil stipulations measured by way of the thoughts and relates

them to archaeological features.

With many illustrations to give an explanation for the textual content and strategies, this ebook could be a useful source for experts and non-specialists in archaeological geophysics alike.

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Extra info for A Field Guide to Geophysics in Archaeology

Example text

7 The ‘wobbly cart’ belonging to English Heritage. It is designed to carry caesium magnetometers in a non-magnetic, suspended environment. These types of magnetometer need to be well-cushioned from mechanical shocks and jarring and completely separated from their electronics and batteries. They can be carried in a suitable frame, but are best mounted on a large carriage, which has to be non-magnetic, and pulled along. This makes it unwieldy and expensive kit, more suitable for research at large budget professional and academic levels.

The lower frequencies (very long wavelengths) extend down to the audio range, but are difficult to transmit. The lowest frequency here (200 kHz) has a wavelength of 1500 m, which is the UK BBC Radio 4 Long Wave transmission. This travels hundreds of miles, over hill and dale, and can be picked up just about anywhere in Europe. Next shown is the band used for FM radio, about 3 m. 7 megahertz’ (mega means a million times). If you multiply that by the wavelength close to 3, you arrive at 300,000,000, which is our speed of light.

If some current can flow, there will be two bad effects for the light. It will slow down, and it will lose energy, so eventually it will sink to nothing. The energy is turned into heat. We are used to water slowing the wave down, an effect known as refraction, because we can see it. When we put a stick into some water, it appears to bend. This is a result of water having a slower speed of light, about one quarter less than the speed in space. The speed of light through the ground is much less than through air, so the wavelength of radar in the ground is much less than it is in air for any frequency.

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A Field Guide to Geophysics in Archaeology by John Oswin


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