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These numbers, when known, are included in the catalogue.

In 1822 a secondary numbering system employing the prefix "B" was introduced for recording underglaze decoration, including transfer-printing, but was abandoned in 1841 after the recording of fewer than one thousand patterns.

In 1852 the main pattern series had reached a cumbersome 10,000 and a new series, in effect a continuation of the main series, was begun using the prefix "D." Early numbers in the D series were given to variations of patterns already in the company repertoire.

The Illustrations The transfer-print patterns are generally shown reduced from their actual size. Besides the patterns themselves, various other elements may appear on the copper plates.

In most cases the prints shown are designed for plates (every different type of object would have its own engraving and print of a pattern), but some of the prints for other objects are illustrated; for example, the print for a souptureen (Fig. As a general rule these would appear on the backs of the finished pieces, but were engraved on the same copper plate as the pattern.

Since Williams used only some of the watermarks as a dating device, his dates are rather less reliable than Whiter's.

Extracts from Williams's dating keys are presented in Appendix B.

Maker's marks appear frequently with the exception of W. Copeland (1847-67) marks which were engraved on separate copper plates.

Registration marks also appear, both the diamond mark, used from 1843 to 1883, and the simpler "Rd No" and number, used after 1883.

Dates The date range given for each pattern name includes, in most cases, the date the pattern was introduced and the latest date for which there is evidence that the pattern was considered usable by the factory.

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