Animal pens and bunny hotels

Project Manager, Paul Coleman, updates us on things underground.

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The Folly is under siege, this time from below.  We continue with the scientific approach of investigations and are radaring the ground for bunnies !!

They may be cute until they dig too close to the walls with their burrows, forming an extensive network of tunnels which can and are causing problems with the stability of the walls.

The area around the Folly is peppered with rabbit activity – what we’ve been doing is investigating where they are and how big their warrens are. But how do you check whether their tunnels are causing a problem or not and the extent of them.  Well, just like on TimeTeam we are using specialists to see under the ground – Peter Masters of Cranfield University is our expert, using his specialist equipment which is dragged behind him to slowly show a picture of the ground around the Folly walls.

WP_20150227_11_44_37_ProHe is using a technique called Ground Penetrating Radar (GPR),  which send electro magnetic pulses to the ground which are bounced back to the receiver and allows us to map out structure and features buried below us.

Some of the holes are ok and not causing a problem but we’ve found 2 areas which will need to be stabilised.

Not only have we found bunny hotels, it has also shown areas of previous buildings (now long gone) which were located around the Folly – we believe these to have been the old animal pens when the Game Keeper was in residence.

The big reveal

Project Manager, Paul Coleman, gives us an update on the Folly.

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The scaffold coming down

For those not fortunate to have visited Wimpole recently, what a view hits you.  From every approach you can we see the Folly, with its new crown as it rises above the park. The scaffolding is down, hoorrrraaaayy.

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The sound of chain saws lingers in the air as our ranger team start to get on top of the years of scrub which has surrounded the walls and has choked the ornate moat. Work to remove the felled timber has included using horses, horse logging, see our Forester Simon’s blog for more on this.  Over the next few months you will gradually see the ground being tendered, brambles removed, barbed wire taken down.

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So what’s happening now…..

  • The rear staircase is being crafted,
  • The support walls outside for the balcony start to get rebuilt,
  • We clear a vast pile of earth,
  • The doors get repaired,
  • Historic locks and door hinges get made to replicate ones from old photos,
  • Inside we continue to repair the lower floors,
  • We get to grip with flattening the ground where we made a little mess over the Winter,
  • . . . and most importantly we get to admire the fab conservation work on the walls

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If you visit the house, don’t forget to go to the Chancellors Dressing Room to admire the views.

We will be reporting on more conservation works over the next couple of weeks, so check the blog again.

Let’s play conservation spot the difference at the Folly….

Clunch weathers in many different ways however what we are seeing at the Folly is the semi hard face of the stone eroding in patches which leaves a soft fragile core face of stone exposed.  These areas are more susceptible to weathering and the decay accelerates as the water gets into the stones and it crumbles fast. In addition once the outer face is lost it reveals the original light cream stone colour which looks blotchy when viewed against the rest of the surrounding stone, the original has built up a patina over the last 240 years. We had a building which looked like a Friesian Cow, patches everywhere.

Area of clunch face loss

Area of clunch face loss

The conservators have been using their artistic touch to colour these areas to match the surrounding weathered and aged stone – the appearance is to capture the years of lichen and algae growth.

A repaired section (around the centre stone)

A repaired section (around the centre stone)

Not only will it blend with the surround stones but more importantly the coloured lime wash (shelter coat) holds the fragile surface in place (called consolidation,  it will bind the surface but allow it to breath. They have an artist’s palette of colour at hand and use a mixture of ingredients, greys, greens, browns, creams and whites.

Pallette test

Palette test

An array of stuff to test

An array of stuff to test

What’s in it … We use a base coat to add the background colours, this consists of : 5 Litre of “Cennini” limewash with casein 5 Litre of water 2.5 Tablespoons Cotswold stone dust 5 Tablespoons Raw Umber pigment and then over this the splodges, sponge effect, lines, with a typical green colour as 750 ml of the Base Mix, limewash with casein 25 ml Terra Vert 10 ml Raw Umber 5 ml Y47 Raw Sienna 2.5 ml Yellow Ochre 1 ml CSK Black there are then the other 5 colour mixes which are individually toned to make sure the Tower of the Folly looks perfect but is well protected.

Coloured sand and stone dust

Coloured sand and stone dust

Preparing lime shelter coat

Preparing lime shelter coat

The lime shelter coat prepared

The lime shelter coat prepared

They even add the white moss / lichen growths.

Repair to bottom left

Repair to bottom left

So can you spot the coloured patches.

A repaired section (look carefully)

A repaired section (look carefully)

Archaeology isn’t all about digging holes…

Paul Coleman, Project Manager updates us on paint.

It’s about uncovering the past to inform the future.

The scientific approach continues at the Folly where paint research has been undertaken to research and investigate the sequence of decorative colours which may have been used on the outside doors of the building.

What we want to do is try to find out what colours and paint types they used since the building was complete (1772) through to its occupation as the Game Keepers House (1805) up to present day.  We are trying to match the colour of the Game Keepers front door…..

The process is an archaeological investigation and we have employed Karen Morrissey a specialist paint researcher to look in depth at the building, colours and paint used.

The process involved taking bits of the paint which then are taken to the laboratory.  The samples were embedded in polystyrene resin, cut in half and the end polished which gives a cross section through the paint layers.  Using very high powered Microscopes under ultra violet and high power lighting – we are able to see each individual layer of paint.

Looking at the sample at 63x magnification, gives very impressive results.

Magnified cross section of paint layers

Magnified cross section of paint layers

Looking more like layers of cheese on toast or a vegetable lasagne, these images allow us to see the number of paint films, including primers and undercoats.

As well as the microscope work, samples were also sent away for testing to establish the presence of any natural, manmade or other pigments (colours), the type of pigment can be used to aid dating of the paint layer.

So, what have we found…..

Sample number 2

Ground floor door frame

 

The frame of the ground floor door is more interesting than the basement door – looking at the paint coatings to the timber and counting them, there are 13 schemes applied. The paints are generally stone and buff coloured lead oil paints; however there is one scheme of ‘invisible’ green and also one of very dark grey/ black early in the paint strata (schemes 2 and 3 respectively). These paints may be ‘impenetrable’ paints, which were manufactured from coal tar.

On one of the samples it shows that the oak timber frame appears weathered, suggesting that the timber may not have been painted originally or that its early coatings failed to protect the timber that well.

From the photographic evidence we can see circa 1880 that the doors were painted in a two tone colour (obviously in black and white in the photo !!!!) but gives an indication of the tonal difference which may be desired.

Problems can be experienced in paint analysis with such things as paint loss on the surface, weathering, deterioration of materials, colour fading and loss and as with the Folly there is evidence that some of the timber to the basement has been stripped with a blow torch.

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Ground floor door

 

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Gamekeepers door showing the two tone effect

The basement door is less interesting as there are only 3 paint layers,  with indication that the door has previously been stripped of all its paint.  However the Microscope images are much more dramatic…..

amber layer

The amber layer is the softwood frame

There is now the debate as to which of the 13 colours we should opt for –  so come along during the Summer to see if you like the Game Keepers front door.

Where looking for Screams and Clouds…..

….. but no Knobs, Stares or Mischief

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5 star accommodation for our mammals and birds are being trialled at the Folly, as scaffold comes down – we have put up a few bat and swift boxes to encourage a different use of the building. (Swift boxes at the top and Bat boxes below)

Whilst there are so many walls at the Folly, we had to be selective due to them interfering visually on the amazing structure, so they are tucked away.  We will keep an eye on if they are being used and possibly move them if not.

We know the area is frequented by a variety of bats some common but some unusual to the area so hopefully their new homes will be attractive.  Our bat records show that we have lots on the estate such as Pipistrelle, Natterer’s, Brown long-eared, Serotine, Daubenton’s, Noctule, Barbastelle and possibly Leisler’s.

So to test your collectives:

Cloud = bats
Scream = swifts
Knob = water fowl
Stare = owls
Mischief = mice

A helping hand

The National Trust works with many partners to promote and conserve the landscape, flora and fauna at Wimpole Estate.  One huge success has been the contributions made through an Environmental Stewardship Agreement, which have enabled essential works to be carried out to improve the parkland.

This great work is explained below….

I’m Alice Bateman and I work for Natural England in our Cambridge office. I have been involved in the setting up of the Environmental Stewardship schemes like the one at Wimpole National Trust for the last six years.

Wimpole’s folly conservation project

 

I am delighted to be working with Paul Coleman and Richard Morris from Wimpole to support the natural environment and heritage works that are underway at the Estate. It’s ensuring that this wonderful historic building and its parkland landscape continues to benefit people and wildlife into the future.

Through an Environmental Stewardship agreement, we are supporting wildlife conservation and parkland restoration here. Natural England has funded the management plan that has guided the repairs work to the Folly and we are helping to fund the restoration work with a contribution of £200,000. The agreement is also helping to safeguard and improve important wildlife habitats on the estate such as planting new trees, grazing the parkland with rare breed sheep and cattle, and managing the land in ways that will benefit declining farmlands birds including Grey Partridge, Skylarks and Lapwing and rare arable plants such as the Wild Pansy, Venus Looking Glass and Dwarf Spurge.

I would really encourage you to take a walk round the estate and have a look at the impressive historic parkland landscape.

A view from the Balcony

Karen Teideman-Barrett, Conservation Architect at Donald Insall talks about designing the replacement balcony and stair at the Folly entrance.

19th Century Photograph with balcony and stair in place

19th Century photograph with balcony and stair in place

Work is underway at the Folly and the Towers and Walls are covered in scaffold.  Earlier in the project, the only way into the Gothic Tower was through the basement and squeezing through a narrow opening into the Ground Floor and, at the same time, ensuring that the pigeons kept out.

We know from historic photographs of the Folly, that there was a wooden stair leading to a balcony in front of the main entrance into the Tower.  This would have been in use during the time that the Tower was the Game keeper’s cottage, from 1805 until the late 1920s.   By the 1970s, this outside staircase was in very poor condition and had almost collapsed and so was taken down.  Now, a new balcony and stair is to be constructed in place of the former stair.

Shadow of Stair on Brickwork c1970s

Shadow of stair on brickwork c.1970s

- and today

. . . and today

Using historic photographs as our starting point, we took detailed measurements of the brickwork on the rear of the tower; we examined brick pockets in the walls that once held timber joists which supported the balcony; we looked at dark shadow lines on the brick where the stair was once positioned.

Yellow brick path uncovered by Oxford Archaeology

Yellow brick path uncovered by Oxford Archaeology

On the ground close to the Tower, investigation work by Oxford Archaeology has uncovered yellow brick paths around the door to the Basement.   These brick paths helped to position the stair and to judge its scale and width.  Some more soil may be cleared away from this area to see how far the brick extends around the basement entrance.

Having collected all this information we are able to develop the stair design and produce scaled drawings so that a new timber stair can be made and installed.  The reconstruction of the balcony will make sense of the two doors at the back of the Tower and will provide access so that the interior can be maintained.