British Museum blog

Lost Change: mapping coins from the Portable Antiquities Scheme

coin visualisation
Daniel Pett, ICT Advisor, British Museum
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Today sees the launch of Lost Change, an innovative and experimental application that allows coins found within England and Wales and recorded through the British Museum’s Portable Antiquities Scheme (PAS), to be visualised on an interactive, dual-mapping interface. This tool enables people to interrogate a huge dataset (over 300,000 coin records can be manipulated) and discover links between coins’ place of origin (the issuing mint or a more vague attribution if this location is uncertain) and where they were discovered and then subsequently reported to the PAS Finds Liaison Officers.

While much of the the data is made available for re-use on the PAS website under a Creative Commons licence, some details are closely guarded to prevent illicit activity (for example night-hawking or detecting without landowner permission) and so this application has been developed with these restrictions in mind. An object’s coordinates are only mapped to an Ordnance Survey four-figure National Grid Reference (which equates to a point within a 1km square), and only if the landowner or finder has not requested these to be hidden from the public.

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The distribution of coins is biased by a number of factors (a project funded by the Leverhulme Trust is looking at this in greater depth) which could include:

  • Whether metal detecting is permitted by the landowner, or the topography makes detecting difficult
  • Soil type and land use
  • Whether there is an active community of metal detectorists within the vicinity

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The tool is straightforward to use. The left hand pane holds details for the place of discovery; the right hand side holds details for the place of issue, the mint. These panes work in tandem, with data dynamically updating in each, depending on the user’s choice. A simple example to get going is this:

  • Click on “Iron Age” within the list of periods
  • Within the right hand pane, click on one of the three circular representations and this will highlight where the coins from this mint were found in the left hand pane. The larger the circular representation, the more coins from that mint have been recorded.
  • If one clicks on any of the dots within the left hand pane, these are selected and an overlay in the right hand pane allows dynamic searching of the PAS database.

The PAS intends to build on this project at a later stage and will be seeking further funding to enable this to happen, with many more facets of discovery available to query the dataset.

Lost Change was funded through a £5,000 grant from the CreativeWorks London ‘Entrepreneur-in-Residence’ programme.

The PAS is grateful to Gavin Baily and Sarah Bagshaw from Tracemedia who developed the application, and everyone who has contributed to the PAS database.

If you have any feedback on the project, please contact the PAS via info@finds.org.uk.

If you would like to leave a comment click on the title

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US artist John Sloan was born #onthisday in 1871. 
John Sloan, painter, printmaker and teacher, first took up etching as a self-taught adolescent.  Moving to New York in 1904, he became part of a group of eight artists, better known as “The Ashcan School”, who focused on creating images of urban realism. Between 1891 and 1940 Sloan produced some 300 etchings. He was also one of the first chroniclers of the American scene and wrote about printmaking and the etching technique.
This etching comes from the series of 10 prints entitled 'New York City Life', recording the lives of the ordinary inhabitants in less affluent areas of Manhattan. The prints had a mixed reception at the time and a number were rejected from an exhibition of the American Watercolor Society as ‘vulgar’ and ‘indecent’. #August is named after the Roman emperor Augustus. Before 8 BC the Romans called it Sextilis! 
This head once formed part of a statue of the emperor Augustus (ruled 27 BC – AD 14). In 31 BC he defeated Mark Antony and Cleopatra at the battle of Actium and took possession of Egypt, which became a Roman province. The writer Strabo tells us that statues of Augustus were erected in Egyptian towns near the first cataract of the Nile at Aswan and that an invading Kushite army looted many of them in 25 BC.
Although Roman counter-attackers reclaimed many of the statues, they did not reach Meroë, where this head was buried beneath the steps of a native temple dedicated to Victory. It seems likely that the head, having been cut from its statue, was placed there deliberately so as to be permanently below the feet of its Meroitic captors.
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Drawing played a major role in Henry Moore's work throughout his career. He used it to generate and develop ideas for sculpture, and to create independent works in their own right.
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#vanGogh #etching Beatrix Potter was born #onthisday in 1866. Here are some of her flopsy bunnies! 🐰
#BeatrixPotter
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