: Cadwraeth

In the last two weeks our Geology galleries at National Museum Cardiff have been closed to the public due to major refurbishments. We are coming to the end now, we are just asking for your patience for a few more days before opening the permanent exhibition again.

We have already written about some of the work in the gallery: cleaning and repairing displays and changing lighting. In addition, we have replaced display screens and fire beams, and here’s why and how.

There are a number of videos in the galleries which used to be played from medieval cathode ray tubes – if you are as old as me you will remember the old TV screens which were always surprisingly front-heavy when you had to lift them. They are larger (deeper, which limits exhibition space), use more electricity and have a lower resolution than the new flat screens we just installed. If you are a regular visitor you will notice that the screens are not sticking out of the wall as much as they used to. And the resolution is sooo much better now! The videos are now much clearer for you, the visitor, while we, the museum, will save money on our electricity bills which we can then invest in improved collection care and exhibitions – everybody wins.

At the same time we used the gallery closure to work at height – underneath the ceiling, to be precise. Fire safety is more than a legal requirement for us; it is part of our work to care for the national collections. After all, if the museum burns down a large part of your heritage disappears forever. From time to time, even fire and smoke detection equipment needs servicing. This was undertaken this week by a specialist company. And this certainly caused a bit of a stir in the building.

As in your house, the smoke detection equipment is situated underneath the ceiling. It’s just that the ceiling in our Geology galleries is about 12m high. We can’t get there with ladders or scissor lifts, not to speak of all the displays that are in the way. The solution was to climb up the walls. So if any staff are still wondering what why there was a man dangling from the ceiling – it wasn’t a burglar, as in the 1996 film Mission: Impossible, but a rope access operator keeping the museum save from fire.

We are now in the process of completing the last few pieces of work and cleaning up in the next few days. The exhibition will be open to the public again on Tuesday 5^th July.

Find out more about care of collections at Amgueddfa Cymru - National Museum Wales here.

Our Geology galleries at National Museum Cardiff are still closed for essential maintenance. We are changing things around a bit – out with the old and in with the new: we are changing old display screens for new ones; old light bulbs for new ones; old fire beams new ones; old dust – well, for no dust at all. Yes, the dinosaurs are having their vertebrae tickled to release some of the dust of the centuries and keep them looking pretty.

Actually, if you have been to see the dinosaurs recently there is a good chance you have left some of yourself on them. Dust in our galleries is composed of tiny particles that come into the building through our ventilation system (although we have very good air filtration). Other dust particles are fibres from the clothes you wear. But the bulk of dust is, actually – well, there is no easy way of saying this: bits of YOU. Especially hair and skin.

Humans are living beings whose bodies renew themselves constantly. Our skin is our largest organ. New cells are formed constantly at the base layer of the epidermis (the outer part of the skin). These new cells move up through the layers of the epidermis and die as they are further away from blood vessels that supply nutrients. Eventually they reach the corneum, the outermost layer, and slough off.

We love having you in the museum (actually, next time you visit why don’t you bring a friend who hasn’t been for a while). But if you shed your skin while you are in the museum you are inevitably leaving a small part of your body in the building. Nice.

These particles are tiny and very light. They will happily settle on surfaces. Our dinosaurs (and, of course, all other displays) provide ideal surfaces for dust to settle. And no, dust bunnies do not evolve into dust rhinos – so there is no need to set up protective zones to save these cute little things.

Dust will form a layer on objects, which, contrary to popular opinion by people who dislike cleaning, is not protective. On the contrary: dust attracts moisture from the air and then becomes very reactive, which can lead to corrosion and other forms of damage to our objects. This is not only unsightly but can result in expensive conservation treatments or even irreparable damage.

We’re in the business of heritage preservation for the long-term. We want to help keep all of the important national collections for generations to come. This includes removing your dead skin cells from the dinosaur skeletons while we have the space to work in the gallery.

And no, we would not get rid of our vacuum cleaner because it is only collecting dust.

Our Geology galleries are going to re-open on Tuesday 5^th July.

Find out more about care of collections at Amgueddfa Cymru - National Museum Wales here.

Next week our dinosaurs will go to sleep for two weeks. The Geology exhibition will close for “essential maintenance” – you will have seen similar signs in other places. In our case “essential maintenance” does not mean that the dinosaurs’ toilet is blocked (now we do have coprolites on display but they are well and truly fossilised). But if you thought all the light bulbs were blown and we have to fit new ones you wouldn’t be far off. Except that we never did have any black holes in our galleries – no need to bring miners’ lamps which are absolutely reserved for Big Pit.

What we are going to do does indeed involve changing light bulbs. We need light in order to see, and without light we would not be able to appreciate most objects in museums. Light, however, can damage many types of objects. You may have noticed at home that old photographs fade, as do organic inks and pigments on prints and paintings. Leave a newspaper out on the window sill for a few days and it will have yellowed.

In the museum, where we preserve objects for posterity, the damage done by light can be a major problem. Any such damage is irreversible and cannot be repaired by our best conservators. Ultraviolet (UV) radiation is particularly damaging. How long do you think museum objects should last? As part of our collections care, we plan lighting in galleries carefully to leave colours bright and vivid for as long as possible.

The new lighting systems we are fitting this month at National Museum Cardiff will be more energy efficient. In addition, the new lights will be of better quality which means you will see objects more vibrantly yet safely, without causing unnecessary fading. Because the new lights also produce less heat they will make it easier and cheaper to air condition our galleries.

Changing the lights is not all we are going to do – there are a myriad of additional jobs to be done while we have the opportunity. All this takes a little time – between the 20^th June and 3^rd July. It won’t really be the dinosaurs changing their own lights, of course – there will be technicians, curators and conservators busily climbing ladders and scaffolding.

We do all we can to preserve our national collections and to improve our sustainability. So please bear with us when you see the signs and come back to see the Geology galleries in a new light in early July.

 Find out more about care of collections at Amgueddfa Cymru - National Museum Wales here.

Adeiladwyd Y Garreg Fawr yn y Waunfawr yn 1544, ac mae yn enghrifft dda o’r math o dŷ a oedd yn gyffredin yn ardal Eryri. Yn ystod y cyfnod yma tai fel hyn oedd tai mwyaf crand y wlad, a sail ein cartrefi ni heddiw. Cyn canol yr unfed ganrif ar bymtheg roedd y Cymry cyfoethog yn byw mewn neuaddau pren unllawr. Rhannwyd hwythau i mewn i dri rhan: yn un pen roedd llaethdy a phantri, ac yn y pen arall oedd yr ystafell wely (y solar). Rhwng y ddau oedd y neuadd – sef ystafell fyw gyda lle tân agored yn y canol. Mae’r Garreg Fawr yn cynrychioli ymadawiad chwyldroadol o’r cynllun canol-oesol gynt, gan gyflwyno nifer o elfennau newydd. Wrth ddewis adeiladugyda cherrig yn lle coed, roedd modd codi dwy simdde effeithiol – un ar bob pen y tŷ. Gan bod y mŵg yn gallu gadael trwy’r ddwy simdde roedd modd creu ail lawr cynnes, di-fŵg, yn y gofod a arferai fod yn llawn mŵg a parddu.

Enwyd Y Garreg Fawr ar ôl y garreg oedd yn brigo i’r wyneb y tu ôl i’r tŷ. Mae ‘Mawr’ yn enw cyffredin ar y tai yma, er enghraifft Tŷ Mawr Wybrnant a Tŷ Mawr Nantlle. Mae’r defnydd o’r gair yn tynnu sylw tuag at safon yr adeiladau, ac hefyd eu maint - oherwydd roedd adeiladau deulawr yn dal yn anghyffredin. Yn fwy pwysig fyth, roedd yn denu sylw tuag at statws y perchnogion o fewn y gymdeithas leol.

Mae’r Garreg Fawr yn un o nifer cymharol fach o dai Eryri sydd wedi goroesi, ac oherwydd hynny o bwysigrwydd cenedlaethol. Erbyn 1976 roedd y tŷ crand yn cael ei ddefnyddio fel sgubor, ac wedi dirywio cymaint fel yr oedd bron yn amhosib ei adnabod. Ar y pryd yr unig ffordd o achub yr adeilad oedd ei symud yn gorfforol - carreg wrth garreg - 165 milltir i Amgueddfa Werin Cymru yn Sain Ffagan, lle cafodd ei ail-adeiladu. Ddeugain mlynedd yn hwyrach mae’r tŷ yng nghanol gwaith adnewyddu.

Gwnaeth ymchwiliad diweddar nodi fod wyneb mewnol y waliau wedi cael ei rendrio gyda sement adeg ei ail-godi. Nid ydym yn ystyried y dechneg yma yn un addas erbyn hyn, ac mae gwaith wedi cychwyn i dynnu’r sement a gosod morter calch yn ei le. Wedi’r newid bydd waliau Y Garreg Fawr yn gallu ‘anadlu’ yn well, a dylai fod yn iawn am sawl canrif arall. Mae’r tŷ yn awr wedi cau am rai misoedd nes i’r gwaith adfer ei gwblhau.

Don't worry no violence was involved. It was the turn of Llainfadyn this week, our quarrymen’s cottage from Gwynedd, to receive a clean and make over from our Historic Interior and Conservation Volunteer team. It was a big task so thanks to everyone involved. This included stripping the beds and giving everything including the feather mattresses a good airing and beating to remove a winter's worth of dust and dirt. As long as the textiles are strong enough this is still a very effective method of removing grime without the aid of modern appliances.

We also held a competition between a modern broom and a traditional one made from hazel twigs (that all important witches’ accessory at Halloween). To help protect the collections on display it's important we try and reduce the amount of dust and dirt being brought into the houses by our thousands of visitors each year. Our first line of defence to achieve this is the cobbles outside, these help dislodge the grit and dirt from peoples' shoes before they even enter the building, but for these to work the cobbles need to be clean and not clogged up with dirt. So one of our first important tasks was to clean the stones outside.

So which broom won? The traditional of course, with its long twiggy brush it was the best at dislodging the dirt from between the cobbles. This job would certainly have been an everyday task for most households in the past.

Our second line of defence to keep the dust down is the rag rug, often found in cottages of this period. These were made from scraps of material or worn out clothes and blankets, so as well as providing much needed comfort and colour they were great at trapping dirt. They could then be picked up, taken outside and beaten with a carpet beater to remove the grime. We are currently making one for Llainfadyn, unfortunately the odd hail storm meant that Jane and Emma had to find seats by the open fire to carry on their work.