Tag Archives: UCL

Adventures in Digital

Hello, my name’s Rose and I’m a student at University College London, where I’m studying for an MA in Digital Humanities. As part of my course I spent ten weeks completing a placement at the BPMA, working with Martin, the Head of Digital, and Rachel, the Digital Media Manager.

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One of the main projects I worked on involved creating 3D models of items from the museum collections using photogrammetry, which I wrote about previously. I’d already learnt a little about the techniques involved, and this project gave me some valuable practical experience putting those lessons into action. It was amazing to be given access to photographic equipment and modelling software, and to have the freedom to experiment with different techniques. I benefitted a lot from the Digital Team’s photography knowledge, and I’m very proud of the models our experiments produced! Check them out here: https://sketchfab.com/postal

3D model of Stamp Snake. You can manipulate the model here: https://sketchfab.com/models/8c78b277cb0c4b2c9a3901970c94e2f4

3D model of Stamp Snake. You can manipulate the model here: https://sketchfab.com/models/8c78b277cb0c4b2c9a3901970c94e2f4

Another project involved digitisation work of a different kind, scanning historical maps and documents. A highlight was handling documents related to the sinking of the Titanic, and learning about the Post Office and Mail Room which were on board. This really made me appreciate how unique a resource the BPMA’s collections are.

I also digitised the negatives of maps depicting different postal routes; it was fun to take a small piece of film and digitise it to reveal the detailed and colourful illustrations it held. Digitisation can help preserve the museum and archive collections and make them more accessible; it’s exciting to think these images could help engage people in the story of Britain’s social and communications history.

Newly digitised map ready if needed for The Postal Museum!

Newly digitised map ready if needed for The Postal Museum!

I really enjoyed my time at the BPMA as I was given the opportunity to develop so many new skills and to work on more projects than I have space to mention! I’m interested in seeing how digital technologies continue to play a part in the BPMA’s work, and especially in the new Postal Museum. My placement gave me a valuable insight into life in the museums and heritage sector, and I’m extremely grateful to everyone I met who took the time to talk to me about their role.

Exploring 3D technologies at the BPMA

The last 12 months have been exciting for the Digital team here at the BPMA. Our Share Academy/London Museums Group funded project, From Vault to View, which partnered us with Mona Hess from UCL’s Civil, Environmental and Geomatic Engineering Department, has given us both a lot to do and to think about. The project has now come to an end, but it has increased the knowledge we now have of 3D technologies, and encouraged us to do much more.

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George V Die for striking leads. 1½d postage British Empire Exhibition, 1925

The aim of the project was to test different methods of capturing objects in 3D. Working with our little-viewed objects, Mona tried a variety of techniques to see what would produce good 3D models and what wouldn’t. The objects chosen posed real challenges: many were made of bright metals, which makes them difficult to capture using laser scanning or photogrammetry techniques; some were complex shapes, such as a flintlock pistol; while others had such a lack of detail making them difficult to measure and recreate as 3D computer models.

So what did we get out of it? Before the project we knew very little about how 3D

imaging worked. We felt the buzz around these technologies, such as 3D printing, but had little idea of how these things were created or how they might be used. All we really knew was that we had a rich treasure of 3D objects that no-one could really access physically in a satisfactory way.

By the end of the project, the BPMA had purchased photogrammetry software which has enabled us to try 3D imaging for ourselves – and the results are extremely promising. These techniques can be learnt by our staff and employed to create 3D models of items in the museum collection for exploration by the public.

This new-found knowledge, though still fairly elementary, has given us confidence to explore other uses for 3D imaging. In December 3D experts, ScanLab Projects, spent a week scanning the work depot, platforms and tunnels of Mail Rail which we will be opening to the public in 2016 as part of our plans for The Postal Museum. The results are truly astounding and we hope to show them in the near future.

Scanner capturing Mount Pleasant platform

Scanner capturing Mount Pleasant platform

Beyond all this, the project has given us an opportunity to revisit the objects and see them afresh. Although we weren’t able to obtain good 3D models of objects such as the large printing plates and the rollers, we did get excellent images of a number of dies using a technique known as Reflectance Transformation Imaging [RTI]. We also obtained an excellent laser-scanned 3D model of the Machin cast of Queen Elizabeth II – a truly unique and iconic object. The fruits of these experiments will eventually be made available via our website and online catalogue as we integrate the technology.

Plaster head of HM the Queen made by Arnold Machin for new definitive issue of stamps, third version (POST 118/5373)

Plaster head of HM the Queen made by Arnold Machin for new definitive issue of stamps, third version (POST 118/5373)

-Martin Devereux, Head of Digital

Capturing Mail Rail: 3D survey of the depot, loop and platforms

Last week was an exciting one for the Digital team here at BPMA! For the past five days, Rachel and I have been accompanying ScanLAB Projects Ltd. while they undertake a 3D survey of Mail Rail.

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Scanner capturing the west platform.

 

ScanLAB have been targeting the areas of the network that are to be the focus of our Mail Rail  visitor attraction – that is the work depot at Mount Pleasant, the platforms beneath Mount Pleasant and the tunnel loop from the depot to the platforms – just about 1km of tunnels.

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Will from Scanlab discusses the technology with guests from FARO, New Scientist and Harry (BPMA Communications Manager).

 

The 3D scanning of Mail Rail is important in that it captures the industrial heritage of an unexplored and little-known feature of central London. The survey records the details and the features of Mail Rail as a working space, with all the flotsam and jetsam left behind when the service was suspended. From tools and equipment to newspapers and calendars from over a decade ago, Mail Rail is a time capsule just waiting to be explored. These features will inevitably be tidied up when we open it to the public so it is crucial to capture that detail for posterity.

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Thomas and Will from Scanlab sharing the raw data.

 

The survey will allow users to see these features in three dimensions – bringing the platforms to life in ways not possible even when the train ride is running. The survey can be shown via the web and used in the exhibitions we create at the Postal Museum and Mail Rail attraction to offer a truly explorative experience of Mail Rail in a way that the train ride cannot. Imagine navigating the tunnels and platforms for yourself?

Scanner on the platform.

Scanner on the platform.

Using the latest scanning technology from FARO, and using the surveying and imaging expertise of ScanLAB, we will be obtaining as faithful a representation of the site as we possibly can. From the work depot to the platforms and the tunnels in the loop around Mount Pleasant, we will be recording a truly significant piece of Britain’s industrial history.

-Martin Devereux, Head of Digital

3D Scanning moves into its final phase

Over the last fortnight we have been undertaking the latest stages of scanning of our 3D philatelic objects as part of our Share Academy funded project – from vault to view.

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Scanning the flintlock pistol.

We took a number of dies, including the Old Original die of the Penny Black, and the Silver Wyon Medal, over to UCL to be photographed in a PTM dome. The dome is opaque and is fitted with 84 flash lights arranged in rings around the hemisphere. Each flash is activated one at a time and a photograph taken. Once all 84 flashes have been triggered the resulting 84 photographs are processed together into one image so that all the lighting conditions can be observed via a special viewing computer program. The observer can manipulate the lighting condition to reveal hidden features – the engraving, the scratches on a die, etc

The activity described above is part of a series of techniques for a process known as Reflective Transformation Imaging (RTI). You can find out more here – http://culturalheritageimaging.org/Technologies/RTI/

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Scanning at UCL

The results of this test are still being processed, but the images we’ve seen so far are impressive and we’re very excited by them.

Last week UCL’s 3D specialist, Mona Hess, visited the BPMA bringing a portable 3D laser scanner with her. This was to be the last set of trials with laser scanning and we wanted to try the same set of objects which were digitised by the PTM dome. This time around, the results were more mixed as the laser had difficulty with the shiny surfaces of the dies and medal. We also tried scanning the flintlock pistol we had scanned previously with the large laser scanner at UCL and the results were slightly better. The scanner rendered the wooden parts of the handle and stock, but struggled to render the metallic parts, such as the barrel and the firing mechanism.

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Latest tests at the BPMA

The preliminary findings of the tests show that the PTM dome renders the most useful images of metallic objects from the stamp printing process. We have one day of scanning left to complete in this fascinating project and we will then make the results of the whole project publicly available.

After a break following the first trials of our 3D scanning project

After a break following the first trials of our 3D scanning project, work continued last week when Martin Devereux, Head of Digital, and Stuart, Philatelic, took three objects to UCL to be scanned by Mona Hess, our 3D specialist. 

These were no ordinary objects, however. Stuart, our philatelic archivist and I took a flintlock pistol used to guard mail coaches, a handstamp used to cancel mail carried by the first airmail trial in 1911, and an iconic plaster cast of Her Majesty the Queen, sculpted by Arnold Machin. The Machin cast is recognised around the world as it has appeared on UK stamps since 1967.

Handstamp getting scanned by the

Handstamp being scanned by the Arius 3D colour scanner.

Each of these items poses a serious challenge to current 3D digitisation techniques. Glossy surfaces and deep features mean that lasers do not work as effectively as with less shiny and less detailed subjects.

Mona spent over 3 hours scanning the plaster cast with the Arius 3D colour scanner, while Stuart and I, along with MSc student, Sarah Sifontes Duran, captured the geometry of the handstamp and flintlock pistol, using an infra-red scanner – a technique that Mona is pioneering. The aim of this work is to produce a set of techniques which can be combined quickly and at low-cost to produce accurate and detailed representations of objects in three dimensions.

Stuart carefully transporting the Machin cast.

Stuart carefully transporting the Machin cast.

Output of the Machin 3D scan.

Output of the Machin 3D scan.

Digitising the plaster cast of Her Majesty was the climax of the day and a highpoint for Mona. She has scanned many memorable objects over the years and the Machin cast is certainly a significant addition to her list.

Flintlock pistol being scanned.

Flintlock pistol being scanned.

Machin cast close-up.

Machin close-up.

Once the cast had been scanned, the remainder of the day saw the scanning of the flintlock pistol and handstamp using the Arius colour scanner.

Mona is working to refine the results of the trials and further work will be undertaken over the summer as the project moves forward.

-Martin Devereux, Head of Digital

From Vault to View: Scanning trials

It’s been an exciting month for those involved in our 3D digitisation project, as it moved into the trial stages. A while back we shared what objects we selected for the scanning. A couple of weeks ago, Mona Hess, the project’s 3D digitisation specialist, visited the BPMA to undertake trials of low-cost scanning and photogrammatery techniques. 

In conjunction with our Conservator, Krystyna Koscia, Mona tested the application of a cyclododecane spray – a substance which, when applied to objects, makes them easier to digitise with a laser–scanner.

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Cyclododecane spray applied to test objects.This substances evaporates shortly after application and makes the object easier to scan with a laser.

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Mona applies the Cyclododecane spray to test objects as Krysia looks on.

The main event of the day was the photographing of a large printing plate against a target background, from which photogrammetric measurement will be taken to create a 3D map of the plate. You can find out more about photogrammetry and other techniques we will be using in this post. The plate was also scanned using a low-cost laser scanner, to obtain a rough geometry of the plate itself. Other objects were also photographed and scanned, including a die, an embossing die, a slogan die and a roller.

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Martin examines the plate.

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Mona standing on a stool for photogrammetry imaging.

You can check out the preliminary 3D model of the plate online now, and manipulate the model. We promise that the final results will be more detailed!

Trials continue in May, when Mona will be using the laser-scanner at UCL to scan other key objects from the collection.

-Martin Devereux, Head of Digital

From Vault to View: Object Selection

Earlier this year we announced  our 3D scanning project with UCL to capture objects from our philatelic collection. Over the past month, the Philatelic team has been selected just a few objects from its vast collection to scan. Joanna Espin, our Philatelic Assistant, introduces the objects in this post.

We have a large collection of three dimensional objects to do with the production of postage stamps; ranging from metal dies and transfer rollers, to printing plates. There are also three dimensional objects to do with the design of stamps and other aspects of postal operations. We have chosen a range of objects, of various sizes and materials, which are important to understanding postal history.

The objects selected are some of the most treasured in the Philatelic collection, and concern the history of the Penny Black, Machin Head and letterpress printing.

Wyon Medal, 1838

The Wyon Medal was the inspiration behind the engraving of Queen Victoria featured on the Penny Black.

Wyon Medal front

Wyon Medal front.

Wyon medal reverse

Wyon medal reverse.

‘Old Original’ Penny Black Die, 1840

The ‘Old Original’ Penny Black die, from which all Penny Black plates and most Penny Red plates were made.

‘Old Original’ Penny Black Die, 1840.

‘Old Original’ Penny Black Die, 1840.

Elizabeth II Machin head plaster cast, 1966

Arnold Machin intended his portrait of Queen Elizabeth to allude to the Penny Black: both were designed from a relief portrait and both monarchs are wearing the George IV State Diadem.

Elizabeth II Machin head plaster cast, 1966

Elizabeth II Machin head plaster cast, 1966

Machin Stamp roller, 1968

This object’s shiny surface has prohibited successful digital rendering. 3D scans would, in connection with the Machin curved plate, explain recess printing.

Machin Stamp roller, 1968

Machin Stamp roller, 1968

Machin curved plate, 1968

The 1968 high value Machin £1 stamp recess printing plate.

Machin curved plate, 1968

Machin curved plate, 1968

Edward VII Die, 2d Tyrian Plum, 1910

Almost 200,000 sheets of this iconic stamp were printed yet only one was ever used, as King Edward VII died before the stamp was issued. We plan to scan the die and box.

George V Die for striking leads. 1½d postage British Empire Exhibition, 1925

This object incorporates interesting shape, detail and colour. It connects with the 1924 Wembley slogan die and letterpress printing.

George V Die for striking leads. 1½d postage British Empire Exhibition, 1925

George V Die for striking leads. 1½d postage British Empire Exhibition, 1925

Downey Head ½d Skin, 1911

The first definitive stamps of King George V’s reign were based on a photograph taken in 1910 by W. & D. Downey. The Downey Head skin we plan to scan is an important part of the history of letterpress printing.

Downey Head ½d Skin, 1911

Downey Head ½d Skin, 1911

Edward VII embossing punch, 1902

Successfully capturing the detail and embossing on the punch would enable effective demonstrations of embossing technique.

Flintlock Pistol, 1816 – 1841

This object demonstrates the diversity of the BPMA Philatelic collection. A 3D rendering of the pistol will highlight the engravings on the end of the barrel, which state that the gun was for official GPO mail coach use.

Flintlock Pistol, 1816 - 1841

Flintlock Pistol, 1816 – 1841

Aerial Handstamp, 1911

The world’s first scheduled airmail service began in 1911 as part of the celebrations for the coronation of King George V. This handstamp, commemorating the event, has wide historical appeal. The object’s shape and material make it ideal for 3D scanning, as reflective surfaces are notoriously difficult to capture.

Aerial Handstamp, 1911

Aerial Handstamp, 1911

Slogan Die, Wembley, 1925

Issued as part of the celebrations marking the British Empire Exhibition, this slogan die has wide historical appeal and, due to its shape and material, is another interesting object on which to experiment 3D scanning techniques.

We will initially test various techniques, a process expected to take several hours for each object, and compare the results to existing two dimensional photographs. The processes to be employed are highly experimental and will shape recommendations for a standardised approach to 3D imaging. The results will enable ground-breaking access to treasured objects in the Philatelic collection and, ultimately, audiences will virtually handle important postal history objects.

Stay tuned next week to find out about the different techniques we will be using!

–  Joanna Espin, Philatelic Assistant