Adrian Stephens was an English

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 engineer, noted for inventing the steam whistle

Steam whistle

A steam whistle is a device used to produce sound with the aid of live steam, which acts as a vibrating system .- Operation :...

 in 1833.

Stephens was born in the Penzance

Penzance

Penzance is a town, civil parish, and port in Cornwall, England, in the United Kingdom. It is the most westerly major town in Cornwall and is approximately 75 miles west of Plymouth and 300 miles west-southwest of London...

 area of Cornwall

Cornwall

Cornwall is a unitary authority and ceremonial county of England, within the United Kingdom. It is bordered to the north and west by the Celtic Sea, to the south by the English Channel, and to the east by the county of Devon, over the River Tamar. Cornwall has a population of , and covers an area of...

 and came to Merthyr Tydfil

Merthyr Tydfil

Merthyr Tydfil is a town in Wales, with a population of about 30,000. Although once the largest town in Wales, it is now ranked as the 15th largest urban area in Wales. It also gives its name to a county borough, which has a population of around 55,000. It is located in the historic county of...

, Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

, in 1827 to work at the Dowlais

Dowlais

Dowlais is a village and community of the county borough of Merthyr Tydfil, in Wales. As of 2001, it has a population of 6646.Dowlais is notable within Wales and Britain for its historic association with ironworking; once employing, through the Dowlais Iron Company, roughly 5,000 people, the works...

 ironworks. The purpose of his invention was to act as a warning device on the boilers, and an early example can be seen in the museum at Cyfarthfa Castle

Cyfarthfa Castle

Cyfarthfa Castle is the former home of the Crawshay family, historical ironmasters of Cyfarthfa Ironworks in Park, Merthyr Tydfil, Wales. Despite appearing superficially to be a fortified building it is a house built in the style of a large mansion...

. Stephens did not patent

Patent

A patent is a form of intellectual property. It consists of a set of exclusive rights granted by a sovereign state to an inventor or their assignee for a limited period of time in exchange for the public disclosure of an invention....

 the device, and it was adopted by the Liverpool & Manchester Railway after it had been seen in operation at Dowlais in 1835.

Sources