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Originally, a system by which fresh air is drawn from outside the building and brought to an acceptable condition in terms of temperature and humidity before being introduced into the building.
The name is often also applied to chillers with no air handling, drying or heating capacity.
Excavation is digging or related types of salvage work, scientifically controlled so as to yield the maximum amount of data. The excavation of a site, however, involves the destruction of the primary evidence, which can never be recovered.
Excavation should therefore never be undertaken lightly or without an understanding of the obligations of the excavator to the evidence he destroys.
CATEGORY: technique DEFINITION: The systematic and scientific recovery of cultural, material remains of people as a means of obtaining data about past human activity.
Steel angle: a steel section whose cross-section is L-shaped. The measurement of angles using 360 degrees in a whole circle, with each degree divided into 60 minutes of 60 seconds each, is of very great antiquity, going back to the Babylonians who used a number system based on 60s rather than tens.
If the vertical and horizontal legs of the ' L' are the same length it is called an equal angle, if different, an unequal or odd leg angle. A basic form of masonry construction dating back millenia.
Yet supermarkets sell a lot of chilled meals that include rice and these can have "use by" dates up to a week away.
What is different about the cooked rice in these meals?It is the excavation of as large an area as possible without the intervention of balks and a grid system.