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The word "ceramics" comes from the Greek keramikos (κεραμικος), meaning "pottery", which in turn comes from keramos (κεραμος) meaning "potter's clay".

Most traditional ceramic products were made from clay (or clay mixed with other materials), shaped and subjected to heat, and tableware and decorative ceramics are generally still made this way.

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With the increasing use of ceramic marks in the 19th century, a large proportion of English pottery and porcelain can be accurately identified and often dated.

'England':- Inclusion of the word 'England' in marks denotes a date after 1891, although some manufacturers (Thomas Elsmore & Sons for example) added the word slightly before this date. It was William Mc Kinley (the 25th president of the USA) who introduced the highly protectionist Mc Kinley Tariff Act of 1890 - this imposed tariffs on many imports (including pottery) in order to make it easier for the American manufacturers to sell their products.

This provided well-known marks such as "Bavaria," "England," "Nippon," - indicating the country of manufacture.

Electronic document, accessed APA style: Peeples, Matthew A. ( ) | return to my homepage | more R scripts | Mean Ceramic Dates: The mean ceramic date (MCD) of an assemblage is a point estimate of the occupation of a site calculated based on the frequency and date range of types present, most often used in historic archaeological contexts.

(2011) R Script for Calculating Mean Ceramic Dates and Estimating Error. The MCD is calculated by multiplying the number of sherds of a given type by the mid-point of the date range for that type (based on absolute dates or the known production interval), summing those values for all types, and then dividing by the total ceramic count (South 1977).

The sample sizes for each row are held constant, equal to the total number of sherds in that row in the original data and with the probability of drawing each ceramic type determined by the actual proportions of that type in the observed sample.

MCDs are then calculated for each of these bootstrapped replicates to provide a means of assessing sampling error associated with the original MCD.

Ceramic art is art made from ceramic materials, including clay.

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