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About the study

The study takes a highly participatory approach to gathering information on historic and living Cossletts, via a soon-to-be-launched website.

Variant names

The dominant spelling in the UK and US is actually Coslett. Cosslett is stronger in Wales. Coslet is almost only found in the US. Corslet and Coslette are both very rare

Name origin

The Oxford English Dictionary (OED) gives the following first definition of corslet / corselet: "€œA piece of defensive armour covering the body."€ Secondary definitions include "€œa soldier armed with a corselet"€, "€œa garment (usually tight-fitting) covering the body as distinct from the limbs"€ and, used in combination, as a "€œcorslet-maker"€ or "€œcorslet-man"€, the latter meaning "€œa soldier armed with a corslet."€ The word is of French origins, and its etymology is given by the OED as "€œdouble dim. of cors, or body".1

Not surprisingly given its etymology, the apparent first Corslet, and many of those who followed, were skilled iron workers. This first 'Corslet' came to Wales to work with iron.2 The Company of Mineral and Battery Works (hereafter "€œthe Company"€) was one of two mining monopolies created by Queen Elizabeth I in the mid 1560s, the other being the Society of Mines Royal. The Company'€™s rights were based on a patent awarded to William Humfrey on 17 September 1565. On 28 May 1568, this patent was replaced by a "€œpatent of incorporation",€ making the Company an early joint stock company. The patent of incorporation provided the Company with monopoly rights to manufacture various products including, in particular, iron wire.

Iron wire had many uses, perhaps none more important than the making of wool cards which were essential to Britain'€™s important wool industry. However, at this time, the methods for producing iron wire in England were traditional ones, inferior to methods that had been long been in use on the European Continent. The main technical barrier was a lack of knowledge about how to produce '€˜Osmond iron',€™ a high-quality iron essential to producing fine, relatively thin and malleable iron wire.

Humfrey was intent on introducing these '€˜modern'€™ techniques. Beginning in November 1566, in Tintern, a village along the Wye River in Monmouthshire, he oversaw the construction of England’s first wireworks operated by water power. What was now needed was a steady supply of high-quality iron from which the wire could be manufactured. In 1567, Humfrey succeeded in obtaining the services of an expert in the production of Osmond iron from the south-western part of Westphalia, in northern Germany. This expert arrived in Wales in 1567 and began working at a forge located in Rhyd-y-Gwern, a hamlet in the Glamorganshire part of the parish of Machen, about 20 miles southwest of the Tintern wireworks. The expert'€™s name was later provided in Humfrey'€™s letter of 24 August 1577:

'one Corslett, a German born who at his coming over into this realm first devised more commodius engines than ever before was known or used in England...engines, tools and devices as were first used and invented by the said Corslet, for the making and hoosing of Osmond iron...'3

According to historian H.R. Schubert, the full name of this expert was Corslett Tinkhaus. His place of origin? Westphalia, Germany.4

  1. 1 See Oxford English Dictionary. 1989. Second Edition. Online version at
  2. 2 The discussion that follows is drawn from two main sources: Schubert, H.R. 1957. History of the British Iron and Steel Industry from c. 450 B.C. to A.D. 1775. London: Routledge and Kegan Paul; Donald, M.B. 1961. Elizabethan Monopolies: The History of the Company of Mineral and Battery Works, 1568-1604. Edinburgh: Oliver and Boyd,
  3. 3 Stringer, M. 1709. Opera Mineralia Explicata. London. As quoted in Schubert, H.R., p. 298. Donald (1961) notes that "€œthe German who supervised the osmund iron works was Corslett", and provides the following original source: Exchequer Deposition by Commission 134/2 Jac. I. Hil. 12. Q.25.(9).
  4. 4 As his source, Schubert, (p.298) states "€œEvidence of the origin of Corslet Tinkhaus kindly supplied by the archive of the Castle of Altena, in Westphalia."€

(Full details of Coslett origins will be provided on the website mentioned above).

Distribution of the name

Wales (especially Glamorgan), England, US, Canada, New Zealand, South Africa, Australia.