National Maritime Museum collections blog
Conservation of a Royal Standard
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June 5th, 2013

One of the objects I have worked on during my time as a HLF ‘Skills for the future’ conservation intern at the National Maritime Museum has been a silk Royal Standard (post 1837). This object had sadly deteriorated to the point where it was difficult to see many of the typical features present in this type of flag. The Royal Standard is flown when and where a monarch is in residence. It has a distinctive layout which has changed over the centuries to include emblems that relate to the formation of the United Kingdom, in this case England, Scotland and Northern Ireland.

Prior to commencing any work on the object, I carried out a full assessment of its condition. This identified two major concerns regarding the long-term preservation of the flag. Most prominently that the warp threads had disintegrated, and left large sections where weft threads were ‘floating’, or only partially still in a woven structure. This gave the flag a straggly appearance with bundles of fibres twisted and knotted together. The flag is also significantly faded. This is particularly evident in areas which have more saturated colour, such as in the folds of the hems, which can sometimes show the original colour scheme of textiles. The main cause of this type of damage is exposure to light.

The Royal Standard flag (AAA2020) before conservation treatment

The flag had been printed or resist dyed to give it red, blue and gold colouring. The red has faded completely, and the yellow has discoloured giving the flag a uniformly brown colour. The printed areas appear to have deteriorated much more than the unprinted areas.  Some historic dyes and pigments contain compounds such as Iron Oxide, that are known to deteriorate over time and damage the materials to which they were applied, and this may be why the printed areas are far more damaged than the unprinted areas.

Royal Standard flag (AAA0809) from the National Maritime Museum collection, showing the intended colour scheme.

The royal lions prior to treatment

The flag was very crumpled and my first priority was to ease out the creases before any stitching could take place to secure it down to a lining fabric. To achieve this without using excessive heat, pressure or water, the best available option available to me was the use of cool moisture through a humidifier, and letting the flag rest under light, flat glass weights until the creases were slowly eased out. Once in this condition, I could place the flag onto a support fabric that I had coloured to match using stable, lightfast dyes. The flag was then secured to the support fabric with rows of couching stitches, and placed onto a padded board. The board provides a rigid but soft support that is suitable for long term storage. A layer of dyed net was used to overlay the surface of the flag, creating a ‘sandwich’ that will keep the fragile fibres aligned and secure for the future.

The flag has been a great project with plenty of challenges. It has enabled me to work through a range of different techniques, that will benefit me greatly in future textile conservation projects.

The Royal Standard (AAA2020) after conservation treatment

An extraordinary day when time and a pig flew…
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December 6th, 2012

To mark the centenary of the sinking of the Titanic on 12 April 1912, the National Maritime Museum put on an exhibition, entitled, Titanic Remembered, which highlighted some of the stories told by survivors of the disaster to Walter Lord, who wrote the book,  A Night to Remember on which the 1957 film of the same name was based.  When the exhibition closed at the end of September, there was a brief opportunity to research two of the Museum’s most emotionally evocative Titanic-related items before they are re-displayed in the ‘Voyagers’ gallery. Both are mechanical objects: an 18-carat gold pocket watch and a child’s musical pig.

Robert Douglas Norman and his 18-carat gold pocket watch (ZBA0004)

The owner of the watch, 27-year old Robert Douglas Norman, had joined the Titanic at Cherbourg, intending to visit his brother in Vancouver and from there continue to travel the world. As a male passenger, Norman’s chances of surviving the disaster were poor at best and his body was one of over 300 recovered by the cable ship, Mackay-Bennett. The watch was returned to his brother and passed down through the family until it was donated to the Museum in 1995.

The musical pig belonged to Edith Rosenbaum (1879–1975), who, like Norman, boarded the ship at Cherbourg. Edith, a 32-year old American, was a successful player in the fashion world and could afford to travel first-class. However, despite her professional success, her personal life was in pieces after she narrowly survived a road traffic accident, which claimed the life of her fiancé, Ludwig Loewe, in 1911.

The 'lucky pig' (ZBA2989)

Edith changed her surname to Russell in 1918, owing to political sensitivities following the First World War. In a televised interview, about 1970, she described how, when was asked to evacuate, she locked all 19 of her trunks before heading for the lifeboats. ‘I never would have left the ship,’  she recalled, ‘but a sailor came along and he said “say you;  you don’t want to be saved, well I’ll save your baby” and he grabbed this pig from under my arm and he tossed it in the lifeboat … when they threw that pig, I knew it was my mother calling me.’ (British Pathé 347801)

Edith followed the musical pig into the crowded Lifeboat 11 and, during the seven hours before being picked up by the passenger liner Carpathia, she comforted children on board with the tune, thought to be the Maxixe, from her lucky pig. Played by Theresa Thorne, Edith and the pig appear briefly in William MacQuitty’s film of Lord’s book, which shows her leaving her jewellery behind in favour of her lucky toy.

Edith Russell meets Theresa Thorne during filming of 'A Night to Remember'

The pig came to the Museum as part of the Lord-MacQuitty collection in 2003.

So did the pig really fly?

Well, dear reader, I am afraid that I may have over-egged the flying bit; it was more like travelling at sensible speed up the M1 in a van en route to the Nikon Metrology factory in Hertfordshire. But it was to be an extraordinary day, and as is the case with extraordinary days, relativity comes into effect and they are over all too soon. Even if the pig didn’t literally fly the time certainly did!

Nikon Metrology produces high resolution X-ray equipment that is normally used for doing failure analysis on, and checking the internal quality and precision of components such as electronic chips, automotive parts and aircraft turbine blades: objects with complex internal structure that have to be made exactly to specification. The systems can also be used to examine material properties in materials research, soil science and geology. We were met by computed tomography (CT) specialist, Andrew Ramsey, who is incidentally the first person in over 2000 years to have seen inside the Antikythera Mechanism, an ancient Greek astronomical calculator, and had very kindly agreed to set a couple of days aside to examine our two Titanic relics using state-of-the-art CT scanning equipment.

A common factor of both of these objects is that neither can be opened without causing irreparable damage. The pig’s body is constructed from organic material, wood and papier maché are identifiable where the legs have broken and the outermost layer is of pig skin moulded around the carcass and pinned in places. Externally there is no evidence to suggest that the toy was designed so that the musical movement could be extracted for servicing and also no clue as to what sort of movement it contains. The watch, with its rust-stained glass and dial, is an extraordinarily poignant object with the hands – which read 3.07 – apparently frozen at the time of entering the water. Because of the watch’s condition and the nature of its history, we could never justify opening its case, let alone dismantling the movement.

Ready for the first scan, the watch safe inside its travel box on the turntable and the lucky pig packed in plastazote and acid-free tissue

We hope that the CT scan will eventually help us to answer the big question surrounding the watch, which is raised by the discrepancy between the time it shows and the officially recorded time of sinking of 2.20 a.m. It has always been believed that watch stopped when it entered the sea and that the time disparity highlights the issue of the changing local time as one travels westwards. Put another way, passengers would probably have had to adjust their watches daily to keep in step with local time, and so Norman would have been due to set his back the following day. But, of course, there was always a slim chance that the watch had stopped some time before entering the water and we hope the CT scan will help clarify this. We also hoped to learn what sort of watch movement was hidden within the case and who might have made it.

When it comes to x-rays, gold has similar properties to lead in that it tends to act as a shield. For this reason the watch went into the scanner first, in case we needed to use a more powerful machine. In this day and age, the x-ray image is not an unusual phenomenon, but the first view of its inside was thrilling: despite the 18-carat gold inner case back, known as the cuvette, we were going to get a really good look.

Each scan took just under half an hour to complete and, during scanning, the object is rotated through 360 degrees. The data is sent to a computer and converted into tiny building blocks called voxels, each representing a cube measuring 32.6 µm across (approximately 0.03mm) which are then put together to create the 3-D model. Once created it is possible to slice through any specified area to have a look inside the object.

One of the first dramatic shots of the mechanism shows it to be an English fusee watch with full-plate movement and bi-metallic balance.

A first view of the watch movement through the cuvette and cap

A maker/retailer’s signature can just be made out but the gold has rather fogged the image. Because of this lack of clarity there is still a lot of sifting to do through the vast quantities of data, approximately 80 gigabytes in total, before we can be certain that we have the answers we are looking for.

By contrast, the lucky pig was far more scanner-friendly and we were very quickly able to see some spectacular results. It required two scans, the first to pick out the details of the main body and a second to obtain good images of the musical movement. To scan the movement, the lower energy radiation had to be filtered out and this is achieved by placing a small copper sheet in the path of the x-rays before they met the object.

The 3-D model of the pig assembled and ready for dissection

Dissecting the digital model down the middle gave us our first view of the pig’s interior and, as can be seen, it is made from moulded papier maché, with a transversely mounted wood soundboard to which the musical movement is mounted.

The rendered dissection showing the inner surface of the carcass, perhaps reminiscent of Damien Hirst’s ‘Mother and Child Divided’

From this scan we learn that the tail is simply a knotted piece of vellum that was never connected to the music box. Prior to scanning it seemed likely that this was spring-driven and activated by pulling the tail but the scans show us that it was a hand-powered type of movement, known as a manivelle (French for crank-handle). By slicing across the width of the model the cause of a rattling noise was identified as a hairpin, probably used in attempt to reconnect to the music box after the crank had broken away. The S-shaped object in the centre appears to be the original crank-handle and tail. Detailed examination of this object shows it to be a skin-covered metal tube, which is an unexpected and very exciting find, perhaps a case for key-hole surgery…

The model bisected horizontally, showing the shell construction of the carcass and the loose hairpin and what is possibly the original tail/crank-handle. The bright spots down the belly centreline are the pins securing the outer skin

The second scan of the lucky pig produced some brilliant images of the musical movement, showing it is quite simple in construction. It has a toothed wheel attached to the pin barrel, which is driven by a worm gear on the end of the crank shaft. The comb is marked with a distinctive star logo, which may in due course help us identify the maker.

Two views of the musical movement

The movement showing the star logo, by the screw on the near corner of the comb

What has been shown here is only the beginning of the study; these 3-D models provide invaluable information that will assist with our curatorial questions as well as the long-term care and conservation of these extraordinary objects.

Conservation of a shipwreck-recovered sextant
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July 3rd, 2012

In the corner of a vast store was a navigation instrument, whose history deserves to be revisited. It has not been used in any major battles, nor did it belong to any great commander. It served ordinary seamen on-board a trawler and it tells the story of the bravery of ordinary men who volunteered to protect British waters during the Second World War.

Admiralty sextant (NAV1229)

As the war in Europe progressed and the enemy started creeping closer and closer to the British shores, the Admiralty appointed a large number of fishermen to form the crews of additional minesweepers. The trawler HMS Royalo was one of those civil vessels converted to use by the Royal Navy in 1940. Its service history was short, for it struck a mine and sunk in September 1940 just off the shore of Cornwall, near Penzance.

The position of the wreck was known to the local community and in 1962 a group of divers recovered a wooden box. As it turned out, it contained a sextant, used for navigation, made in 1939 by famous Hughes & Son Ltd. of London. The Royal Museum Greenwich acquired the sextant in the 1970s.

During a recent inspection of scientific instruments it was decided the object should come to conservation for further investigation and possible treatment. As an intern at the Museum, I saw the instrument as an excellent learning opportunity, because it presents many intriguing conservation issues.

The sextant has the most fascinating combination of colourful corrosion products I have ever encountered. The instrument is made of different copper alloys, originally covered with a layer of paint. Sea water contains large amount of chloride and sulphide ions, which react with the metal. Different shades of green, blue, grey and yellow corrosion products covered large areas of metal surfaces. The paint remained unaffected by the elements, causing an ethical dilemma when considering any conservation treatment. Original paint is part of the object and should not be damaged by conservation treatment. The dilemma is whether to sacrifice the original finish for the longevity of the instrument or to do as much as possible without damaging the surface. A number of methods were tested to implement the second option. The best results were achieved using chelating agents, which chemically bond and remove the particles of corrosion products. The surface was then covered with a coat of wax to prevent oxygen and moisture reaching the metal and causing further corrosion. The sextant needs to be monitored regularly to make sure the treatment was sufficient.

Treatment of the sextant

Had it not been for the wooden box however, the preservation of the instrument would be considerably worse. Worm holes cover large area of the lid, causing the wood to become fragile and soft. Any loose dirt was removed mechanically from the box. The surface was washed with special soap and the most fragile fragments were carefully consolidated chemically using a syringe. Afterwards, a protective layer of wax was applied to all surfaces.

The main purpose of conservation treatment is to make sure the instrument survives intact for as long as possible. The damage sustained during its burial at sea is now part of its history.

Cleaning and reinterpretation of Miss Britain III
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May 21st, 2012

As part of the redevelopment of Neptune Court, right at the heart of the National Maritime Museum, the iconic power boat Miss Britain III has been the subject of a great deal of attention from the conservation team.

Miss Britain III (BAE0064)

Miss Britain has always been of interest to me as she was built in my home city of Southampton. In 1933 she competed in the Harmsworth Trophy and later that year became the first boat to break the 100mph barrier. Despite approaching her 90th birthday she still shines in the sunlight and draws lots of attention from visitors.

During the first phase of the redevelopment Miss Britain was removed from her old stand, allowing better access for the conservation team, whilst awaiting her new stand. This allowed the Museum’s metals conservators to gain access and work on the gearbox which had been previously difficult.

Following on from this work, my colleague Fay, and I gave her the most thorough clean which has been possible for some years. Although she is cleaned nearly every week on the outside, the inside is usually out of reach. This clean largely consisted of removing dust, which was a loose covering outside, but thick and more compacted inside the boat. This is important to remove for several reasons. Firstly it affects the appearance of the object, making it dull and less eye-catching to visitors. Secondly, the dust can cause chemical or physical damage through abrasion or retaining moisture.

On the outside, the aluminium bodywork was cleaned with soft cloths and hogs hair brushes. This involved a detailed brushing out of every rivet and join. It is vital that this is carried out carefully, as any rough action can be abrasive and cause damage to the relatively soft surface. Although painstaking, the end result was excellent to see.

Once the outside had been cleaned it was time to turn our attention to the inside of the cockpit, and this was where the fun really started! Access was a tricky issue, with only two small openings, each with a fragile leather seat underneath. This meant that we had to lean head-first into the seating area, balancing on the wings of the boat and working as quickly and carefully as possible. To ensure that we did not cause damage through this process we had to first pad the wings with acid-free tissue and plenty of bubble wrap.

As the leather of the seats is so old it is quite dried and cracked, and so can only be gently dusted with our softest of goat hair brushes. This is done in conjunction with a low-suction vacuum cleaner to remove the dust leaving the surface of the object undamaged. The large ‘clumps’ of dust along the creases of the seat needed to be removed with tweezers as they were more robust than the surrounding leather at this point, and we found a number of stray sweet wrappers in the foot well as well! It was quite slow work due to the build-up of dust, but satisfying at the same time.

On the dashboard we were surprised to see not one, but two St Christophers, the patron saint of mariners. Seeing these small details on museum objects, although in this case it is something not visible to visitors, is always a pleasure. They give objects like Miss Britain a human story, bringing to mind a young man, unsure of how safe his journey was, placing his faith in the saint to bring him back from the journey.

The St Christophers inside Miss Britain III

Miss Britain III will be moving to her new stand in Neptune Court during May.

Conservation of a pair of Siebe Gorman weighted diving boots
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March 6th, 2012

Whilst undertaking my internship in the Metals Conservation studio at the National Maritime Museum, Greenwich, part of my duties involve regular visits to the stores. On a routine inspection of one of the sections, the discovery of these interesting objects quickly caught my attention. A pair of weighted brass and leather diving boots, with brass buckles and copper rivets is not something that one comes across every day.

Manufactured by famous London diving company Siebe Gorman in the mid-19th century, these boots would have been used for underwater diving on a soft and loose bottomed sea bed such as sand or silt.

The boots were showing signs of active corrosion products of a bright green soft waxy deposit predominantly around the areas where the copper rivets attach to the leather. This is caused by the reaction between the free fatty acids found in the leather with the copper, which forms a waxy metal salt, most commonly known in conservation as a metal soap. The brass was also covered in a green corrosion product, although this was a harder product, more firmly attached to the metal. The leather was dirty, very waxy and rigid and brittle in areas and due to its weight, the leather had collapsed and ‘set’ itself into a slumped form.

Various methods of treatment were decided on to remove the corrosion products, clean, reshape and support the slumped leather suitable for re-storage. Delicate mechanical removal of the waxy deposits was undertaken, taking care not to damage the brown coloured copper oxide layer beneath. Whilst working under a 20 x microscope mechanical removal using a scalpel was used to remove the harder corrosion products from the brass components. A temporary custom built ‘tent’ was used to house the boots for humidification to soften the leather to enable re-shaping and support.

Conservation work on the diving boots is still underway. I am continuing to stabilise the corrosion and will shortly start constructing inner supports for the leather.

Siebe Gorman Diving Boots before conservation treatment