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Eratosthenes - Calculation of the Size of the Earth, Geography, Prime Numbers Sieve 220-206 B.

Vitruvius - De Architectura: The Ten Books on Architecture, Odometer 50 A.

See also the timeline of the Discovery of the Elements Note Some events are grouped together to make it easier to follow a theme.

The dates indicate where to find the event in the text. Mesopotamians - (Sumerians, Babylonians and Assyrians) - Bronze Age - Weapons and Tools, Cuneiform Writing, Wheel and Axle, Potter's Wheel, Mathematical Numbering Systems, Calendar with Leap Years, Glass 2500 B. Egyptians, Imhotep - Soldering, Wire Drawing, Architecture, Medicine 2300 B.

It is vital for a radiocarbon laboratory to know the contribution to routine sample activity of non-sample radioactivity.

Obviously, this activity is additional and must be removed from calculations.

This is calculated through careful measurement of the residual activity (per gram C) remaining in a sample whose age is Unknown, compared with the activity present in Modern and Background samples. Thus 1950, is year 0 BP by convention in radiocarbon dating and is deemed to be the 'present'.

You can get an idea of the relationship between C14 and age at the Carbon Dating calculator page. 1950 was chosen for no particular reason other than to honour the publication of the first radiocarbon dates calculated in December 1949 (Taylor, 19).

Another standard, Oxalic Acid II was prepared when stocks of HOx 1 began to dwindle. The ratio of the activity of Oxalic acid II to 1 is 1.29330.001 (the weighted mean) (Mann, 1983). There are other secondary radiocarbon standards, the most common is ANU (Australian National University) sucrose.

The ratio of the activity of sucrose with 0.95 Ox was first measured by Polach at 1.50070.0052 (Polach, 1976b:122).

Beukens (1994) for instance has stated that this means the limit of the range for his Isotrace laboratory is 60 000 yr which is very similar to the conventional range.

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