May 22 2020

Home improvements: Conservatory edition

In a break from my usual service I thought I’d write about some DIY I have been doing during the covid-19 movement restrictions which have meant we have been confined to the home for a large part of the time. The idea of this blog post is to remind me what I have done, and perhaps provide a guide to others.

The Problem

Our house has a small conservatory at the back which opens into the dining room and looks out onto the back garden which is rather pleasant. It contains a large collection of toys, mainly Lego which lives on and in  Ikea Trofast storage units around the perimeter. There is a bespoke storage unit which holds more toys, including mounts for my son’s substantial collection of nerf guns. More recently it has gained an electric drum kit, and my guitar amplifier. It is where I practice playing, slightly detached from the rest of the family but vaguely audible and visible. It is also the cat’s dining room.

Below is a "before" picture, taken nearly 10 years ago to illustrate our new patio. It serves to shows the context of the conservatory rather than illustrate the problems:

IMG_1115

The Problem is that the conservatory faces west and this means for a substantial part of the year it gets unbearably hot in the afternoon, and very bright. Before the movement restrictions there were no blinds or window covers of any sort. Along with the issues of heat, it is also a little unattractive to look into and the view to one side looks into an odd space outside our kitchen door, facing onto our neighbour’s kitchen extension. So some decorative interest would not go amiss.

I have a vague plan to replace the conservatory with an extension running across the back of the house, so I don’t want to spend a huge amount of money for something that will be torn down in a few years time.

Some solutions

The deluxe solution to this problem is to get in someone like Hilary’s blinds who do a bespoke installation. It’s not quite clear what the price would be but it looks like well over £1000 possibly approaching £2000. Also they cover off the blinds side of the problem well but not any sort of decorative elements and the flexibility around what to do with the roof is limited.

I also looked at these clip fit blinds (and here), they are made to measure and have a spring fitting that sticks under the double glazing seal to hold them in place. They would be rather cheaper than the Hilary’s blinds option – probably a couple of hundred pounds for the four windows I’d like to install them on – the big ones looking down the garden. I looked at a few options like this but held off since I wasn’t confident of delivery under the circumstances. I also wasn’t too sure about whether the anchoring mechanism would work on my windows and under the current circumstances sorting out issues would be a pain.

As it turns out there is a very cheap blinds solution: Stick-on paper blinds! You can get a pack of six here on Amazon for less than £25. I liked this option because it was really cheap and, following a comment on the Q&A on Amazon I thought I could use the paper blinds as a try out for style and if I liked them go for some of the clip fit ones.

For the roof I felt there should be some sort of billowy sail like drapings which I thought would be rather good but I couldn’t find just I what I was looking for – again there seemed to be bespoke options but the route to DIY installation was not so clear. There are "conservatory sails" but these are sails which you use as a sun shade rather than install in a conservatory. I worried about fixings for such things too – I would need to screw mountings into the UPVC frame of the conservatory which didn’t seem ideal. In the end I went with this high reflective film for the roof, I think it had come up as I searched for blinds and the like. It cuts out about 90% of the light which is fine for a sunny spot. I spent about £140 on the reflective film.

Finally the decorative part to go on the windows looking towards the back door. It took me a while to hit the right such term for this, I ended up with this "privacy film" with a bird pattern – I spent about £40 on this.

Installation

I installed in three stages. The patterned film was a couple of evenings after dinner. The paper blinds similarly a couple of short evenings. The reflective film was an evening, and three weekend mornings – a rather bigger job. I wish I’d installed the paper blinds last because they didn’t like having water dripped on them and installing the films required quite a lot of water

The paper blinds are the simplest to install – you cut them to width with a pair of scissors and then stick them to the window at the top with a sticky strip. I found cutting them neatly tricky because they are pleated, and sufficiently thick that you can only cut them a couple of folds at a time. They come supplied with some little alcohol wipes so you can make sure the window you stick to is really clean. Each blind comes with a couple of plastic clips which you can use to hold the folds of the blind up. The inadequacies of my cutting and installation are not too obvious, these blinds work quite well. I found it necessary to cut them to length in order that the clips were able to old the folded part. They could do with a stiffening rod along the bottom edge.

The decorative film was relatively easy to install, you cut to size then peel off a backing film, wet the window thoroughly then squeegee them into place to remove the bubbles. My Stanley knife blade was feeling its age so I ended up scoring the film with the blade then cutting it with the scissors which occasionally left untidy edges. If I did this again I’d use more water on the window – a lesson I learnt from the final piece to be installed.

I left installing the reflective film for last since it involved working overhead and looked the most difficult. The length of the roof panes in the conservatory is nearly 3 metres, I decided wrangling that length of wet, sticky, thin film above my head was a step too far. So after a bit of experimentation I went for installing 150 centimetre strips, this worked pretty well. Installation was similar to the decorative film, except the instructions suggested spraying the window with water spraying the film with water and then spraying the exposed surface of the film with water once it was in place. This was a lot of water, most of which dribbled down my arms as I squeeged the film into place but it actually worked really well. Initially the film has lots of bubbles under it but one pass of the squeegee sorts most of that out. You need to clean the windows properly before putting the film on since any dirt leaves pimples in the film. I never quite cracked cutting the film to exactly the right size, if you cut slightly to big then I found it impossible to cut neatly down to size once in place (perhaps a sharper Stanley knife would have helped), so I ended up undersizing slightly – this isn’t too noticeable though. Similarly butting the edges of the film together was a bit tricky but mistakes here only show if you stand staring at the roof. Finding a corner to peel off the backing takes a knack, I found the best way was to pare away a corner.

The picture below captures the decorative film, the blinds and the reflective film once installed. The narrow windows at the top also have the reflective film on them.

finished

Close inspection shows the installation is not perfect but imperfections are only really noticeable to me when I go looking for them. This second picture shows a bit more context, it is full sun outside and the conservatory is not overheating!

finished2

I wondered about putting some modesty panel style film on the lower half of the patio doors.

Conclusions and further work

I am quite pleased with the results, the conservatory no longer gets unbearable hot in the sun. The reflective film is perhaps a little too reflective in the morning making the dining room a little dim. I’m not sure what the solution is here, the conservatory is quite small and I worry more substantial blinds, and their control mechanisms would be too bulky. You can get electrically switchable window/films but they cost about £40 for an A4 sized panel. The blinds look like pleated paper which is exactly what they are – I will replace them with proper fitted ones in due course.

May 08 2020

Book review: The Pope of Physics by Gino Segrè and Bettina Hoerlin

fermiThe Pope of Physics by Gino Segrè and Bettina Hoerlin is the biography of Enrico Fermi. I haven’t read any scientific biography for a while and this book on Enrico Fermi was on my list. He is perhaps best known for leading the team that constructed the first artificial nuclear reactor as part of the Manhattan Project. As a lapsed chemical physicist I also know him for Fermi surfaces, Fermi-Dirac statistics, and the Fermi method. Looking on Wikipedia there is a whole page of physics related items named for him.

Fermi was born at the beginning of the 20th century, his parents were born before Italy was unified in 1870 when illiteracy was not uncommon and people typically stayed close to home since travel quickly involved crossing borders.

Fermi was identified as something of a prodigy whom a friend of his father, Adolfo Amidei, took under his wing and smoothed his path to Pisa Scuola Normale Superior. As I sit here in in a mild lockdown I was bemused to note that the entrance exams Fermi took were delayed by the 1918 Spanish Flu pandemic. At Pisa Fermi learned largely under his own steam, at the time physics was not an important subject – the Pisa Scuola had five professors in physics and only one in physics. Fermi graduated at the top of his class.

After Pisa Fermi fell into the path of Orso Mario Corbino, a physicist, politician and talented organiser who set about helping Fermi to build a career in physics. At the time a new quantum physics was growing, led primarily by young men such as Pauli, Dirac, Heisenberg and Schrödinger who was a little older. Fermi met them on a scholarship to Göttingen in Germany. He later went to Leiden on a scholarship where he met Ehrenfest, and Einstein who was very taken with him. This was preparation for building a new physics capability in Italy.

The fruits of this preparation were a period in the mid-1930s which saw Fermi and his research group at Rome University invent a theory of nuclear decay which revealed the weak nuclear force and postulated the existence of the neutrino (this theoretical work was Fermi’s alone). The wider research group studied the transmutation of elements by slow neutron bombardment. This work was to win Fermi the 1938 Nobel Prize for Physics.

This research led on directly to the discovery of nuclear fission and the chain reaction which became highly relevant as Fermi fled Italy to the US with his wife on the eve of the Second World War. Many of Fermi’s friends, including his wife Laura, were Jewish. Fermi steered clear of politics to a large degree, he benefitted from the patronage of Mussolini but was no fascist enthusiast. The Italian uses of chemical weapons in Ethopia and, ultimately, the racial laws of the late 1930s which expelled Jews from their positions drove him from the country. He had visited the US a number of times in the early 1930s and had little trouble finding a position at Columbia University.

The route to the atomic bomb was not quick and smooth in the early years of the war, a number of physicists had noted the possibility of the fission bomb and attempted to warn politicians of its potential. This all changed when the Americans joined the war, following the Japanese attack on Pearl Harbour.

Building an atomic bomb presented a number of scientific challenges which Fermi was well-placed to address, primary amongst these was building “Critical Pile 1” the first system to undergo a self-sustaining nuclear chain reaction. It was constructed, slightly surreptitiously, in a squash court at Chicago University. It was built there as a result of a dispute with the contractor who was due to build it a little outside Chicago, at Argonne.

The “critical pile” demonstrated two things: firstly that chain reactions existed, and secondly it provided a route to producing the nuclear isotopes required to produce a bomb. It still left the question of how to purify the isotopes, and the question of how to produce a critical mass fast enough to cause a worthwhile explosion.

Fermi would go on to help in the Manhattan Project at Hanford and then Los Alamos where he held a position combining both universal scientific consultancy and administration, or at least organisation.

It is difficult to talk about Fermi’s strengths as a physicist – he had so many – he is almost unique in being both a top flight experimentalist, and theoretician. This is the great divide in physics, and people who are talented in both fields are rare. He was also clearly an excellent teacher, as well as undergraduate teaching and writing a high school physics book he supervised 7 students who would go on to earn Nobel Prizes in physics. Alongside this he was clearly personable.

Fermi died in November 1954 a little after his 53rd birthday, leaving in his wake a large number of prizes, buildings and discoveries as a memorial.

I found The Pope of Physics highly readable, the chapters are quite short but focused.

Apr 18 2020

Book review: Sea monsters on Medieval and Renaissance Maps by Chet van Duzer

sea_monstersA borrowed book for my next review: Sea monsters on Medieval and Renaissance Maps by Chet van Duzer. Mrs H bought this as a by-product of buying a Christmas present on some quirky gifts site.

The book is well-described by its title, it is about sea monsters on medieval and Renaissance maps. Although a couple of classical antecedents are mentioned the main action starts in the 9th century and finishes at the beginning of the 17th century.

The book is organised roughly chronologically without chapters but with sections recorded in the contents – there are approximately 50 sections broken up by four "pictorial excursions". Much of the material is from the 16th century. As we go further back in time fewer and fewer examples of any sort of written or printed materials survive. Prior to 1472 any maps will have been reproduced by hand rather than printed.

Sea monsters were not found universally in maps through this period, in fact they were relatively rare. Adding sea monster was an additional cost and rarely added any useful information. The sea monsters were often drawn separately from the cartographic elements of the map, suggesting they were a specialisation. Sometimes they were direct copies from other sources. Sea monsters were often derived from recent scientific works, and influences can be seen across multiple maps. Sometimes the sea monsters depicted are playing a role in myths or stories such as Jonah and the whale, or the story of Saint Brendan who, on a voyage, is said to have landed on a whale, not realising its nature a fire was lit and the whale sank beneath them.

There is a lot of evidence of artist working from verbal descriptions of animals by non-expert observers. This is at a time before naturalists had been invented so observations of wildlife were not systematic. There’s a great double page spread illustrating the development of drawings of walruses from pretty much elephants to recognisable walruses(see below).

walruses_1walruses_2

Figure 1: The cartographic career of the Walrus

Sea monsters came in various forms, many reflected real animals we might see today, although rendered strangely as we see with the walrus. Others were human – animal hybrids such as mermaids. Finally there are the outright whimsical – various dragons, krakens, unicorns – owl faced creatures and the like.

Mappamundi were the earliest maps to contain sea monsters although they are not maps as we would recognise them, you couldn’t navigate by them. They were symbolic representations of the world both physical and spiritual, rather than being entirely useful for navigation. A common feature was that the focus in these maps on the land rather than the sea. I was confused by mentions of the Beatus mappamundi which appears in multiple locations before realising that these were copies of a single mappamundi which varied since they were manually created. The place name refers to a particular copy (i.e. Genoa or Manchester), and different copies have different sea monsters. They are based on a map found in the Commentary on the Apocalypse by Beatus of Liébana. This was written sometime in the 8th century and subsequently copied.

The earliest surviving navigational maps are from the 13th century, these are intended as more functional objects and initially focussed on the region around the Mediterranean. In contrast to the mappmundi, these maps were focussed on the sea and coastal areas. There were variants made which clearly played a more decorative role, collectors items that showed your wealth and knowledge. These maps were more likely to contain illustrations of sea monsters.

In addition to freestanding maps there were also illustrated versions of Ptolemy’s Geography which included sea monsters, although the Madrid version of 1455-60 is the only manuscript version to include such sea monsters. Later printed version contained more sea monsters.

The sea monsters in Olaus Magnus’s Nautical chart and description of the Northern lands and Wonders published in 1539 are particularly rich and varied. They can also be found copied in Mercator’s globe of 1541 and Euphrosynus Ulpius’s globe of 1542. Mercator was less eclectic in his collecting of sea monsters for his atlas of 1569.

The book finishes as the 17th century opens when fantastical sea monsters on maps largely fell out of favour to be replaced with more ships and practical illustrations of whaling and the like. The sea was no longer quite so mysterious and man was increasingly exerting control over it, and its contents.

This is a fun book, a nice present for a cartophile. It would have been good to have a timeline of the maps discussed. There is probably an interesting parallel book on the monsters seen in terrestrial maps of the same period.

Apr 06 2020

Strategies for dealing with anxiety

These are some strategies for coping with anxiety which I have been learning about in counselling sessions which I have been doing over the last few weeks. For me anxiety manifests itself as a tightness in the chest, disturbed sleep – typically waking very early, and repetitive thoughts. The repetitive thoughts can be benign, aside from keeping me awake all night, or they can be about how I’m going to fail to do something and let people down. These thoughts become more and more consuming. The current covid-19 pandemic actually helps me with my normal anxiety since the things that usually make me anxious are forbidden! It turns out this is not unique – see this article.

    • Mindfulness – this is a general strategy which is about focussing on doing one thing at a time, being engaged in that one thing exclusively. It can be applied to many activities but often it is used with a breathing exercise – focussing on counting breathes. For me a good start is not looking at my mobile phone when I am doing something else! That said the Headspace phone app provides some useful exercises in mindfulness;
    • Worry time – this is a strategy for dealing with underlying anxiety. The idea is that you set aside a time for worrying, and if you find you are worrying outside that time you can put off worrying until later. My strategy involved deferring worrying but then not scheduling worry time. I’m not sure whether this is how it is supposed to work but it is effective to a degree! There are some more notes on this here;
    • Safe space – this a strategy for dealing with anxiety in the moment. It involves focusing the mind on a “safe space”, a place where you feel safe and relaxed. It’s best not to include people in your safe space since they can be unpredictable and stressful. I use a place where I go walking, I also use the feeling of sitting on my train reading my book after it has pulled away from the station although this one isn’t so good since the train may stop unexpectedly or get busy. There is an exercise of safe spaces here;
    • Narration – this is a strategy for dealing with anxiety in the moment. It involves narrating what you are doing as you feel anxious thoughts arising. It always makes me think of the Pulp track, I Spy. It is a form of distraction;
    • Empty bowl meditation – breathing exercise with focus on endpoints and the flow. The breathing exercises I’ve done in the past tend to focus on counting breaths rather than observing individual breaths in detail.Instructions for this are here. I keep reading this as “Empty Bowel”…;
    • Willing hands – different posture for anxiety reduction. Looks like the “classic” mediation/yoga pose with palms upwards. The idea is that it prepares you for acceptance. Instructions for this are here – page 175;
    • Radical acceptance skills – this is a general strategy about accepting things as they are not as you wish them to be. The radical here just means ‘complete’. One difficulty with anxiety is the feeling that you should somehow be able to think yourself better, that an act of will will cure you. This reminds me of the lyric from Frozen “Let it go, let it go…” Instructions for this are here, they are oriented around dealing with past painful events;
    • Compassion mindfulness – this is a general strategy about feeling compassion towards yourself. It fits in with the acceptance exercise and starts with feeling compassion towards someone else (the exercise uses the Sanskrit word metta which means compassion or loving kindness). Instructions for this are here;
    • Relaxation – muscle relaxation is a common strategy in mindfulness. I see it more as a focus on the body and bodily sensations rather than muscle relaxation per se. There are some instructions here;
    • Effective rethinking and paired relaxation – this combines the relaxation step above with “rethinking”, that is taking a stressful situation and replacing the thoughts causing distress with alternative less stressful interpretations. Instructions for this are here (on page 332);
    • Body scan meditation – this is another mindfulness technique, I get hung up on the fact that it asks me to imagine my breathe flowing to my toes – which is not how respiration works! I should work out a suitable modification. Instructions for this are here (on page 335);
    • Wise mind: states of mind – this is more background than a skill as such. It talks about the combination of the logical “reasonable mind” and the “emotion mind”. The handout for this is here (on page 50);

Obviously, it doesn’t really work to only try these things only once you are having a bit of a crisis. I have struggled to find a quiet time to practice, we have an early rising 8 year old around the house the whole time at the moment. I’m working on practising when I wake up before I get up, this is usually a guaranteed quiet time.

These strategies come from the Dialectical Behavioural Therapy (DBT) family which is related to Cognitive Behavioural Therapy. (dialectical means relating to the logical discussion of ideas or opinions, or concerned with or acting through opposing forces).

Mar 05 2020

Book Review: The Egg & Sperm Race by Matthew Cobb

egg_and_spermI follow quite a few writers on Twitter, and this often leads me to read their books. The Egg & Sperm Race by Matthew Cobb is one such book. It traces the transition in thinking on the reproduction of animals, including humans, which occurred during the second half of the 17th century.

Prior to this we had some pretty odd ideas as to how animals reproduced, much of it carried over from the Ancient Greeks. Ovid and Virgil both claimed that you could make bees by burying a bull with its horns protruding from the ground, waiting and then cutting off the horns to release the bees! This confusion is not surprising, the time between mating and the appearance of young is quite long, and the early stages of the process are hidden by being very small, and deep inside animals.

A random “fact” I cannot help but repeat is that Avicena wrote that “a scorpion will fall dead if confronted with a crab which a piece of sweet basil basil has been tied”. I wonder sometimes with quotes such as these whether they are a result of mistranslation, or a bored scribe. The point really is such ideas were not discounted out of hand at the time. The Egg & Sperm Race starts with a description of da Vinci’s copulating couple which is beautiful but wrong – da Vinci connects the testicles to the brain – these structures do not exist.

The heart of the action in The Egg and Sperm Race is in the Netherlands, in England the Royal Society showed relatively little interest in generation aside from some experiments on the spontaneous generation of cheese mites. The Chinese and Arab scholars who had worked in various fields showed little interest in generation.

The central characters are Jan Swammerdam, Niels Stensen (known as Steno) and Reinier de Graaf, who met in Leiden at the university in the early 1660s when they were in their early twenties. Swammerdam and Steno were a little older than de Graaf and were close friends. Soon after meeting in Leiden they visited Paris where they continued to build contacts in the scientific community.

In understanding generation a first step was to realise that all animals came from other animals of the same species, and that this meant mating between two animals of the same species. Steno went to Italy and worked with Francesco Redi’s whose experiments were key to this, he checked exhaustively that insects did not arise from the putrefaction of material. Swammerdam was also interested in insects, classifying four different types of invertebrate development and showing that in moths traces of the adult form are found in the caterpillar. At the time it was not clear that the larval stage and the adult were the same species.

A second step was to realise that all animals came from eggs of some sort, William Harvey –  of blood circulation fame – did experiments in this area but although he stated this conclusion but it was not well-supported by his experiments. In the period at the beginning of this book, the role of the ovary was not understand. Steno carried out dissections on fish both those that laid eggs, and those that gave birth to live young from this he concluded that the ovaries were the source of eggs and asserted that this was the case for humans as well. This idea rapidly gained acceptance.

The discovery of the human egg, and its origins in the ovary, was the subject of a dispute between de Graaf and Swammerdam on priority. The Royal Society decided in favour of van Horne with whom Swammerdam had worked on the dissection and illustration of female reproductive anatomy. To modern eyes the written record of the dispute, in letters, and publications is surprisingly personal. De Graaf died at the age of 32 just prior to the Royal Society decision. It was a difficult time in the Netherlands with the country at war with England and France with France troops invading parts of the country.

Leeuwenhook cast a spanner into the works with his microscopical studies, he observed spermatozoa but not the female egg and as a result became a “spermist”, believing that life came from the sperm in contrast to the “ovists” who believed life came from the egg. We now know that they are both right. The human egg was not observed until 1826 by von Baer. And I have to mention Spallazani’s experiments on frogs wearing taffeta shorts, demonstrating that male sperm was required to fertilise the female egg.

The final chapter covers events from the end of the 17th century or a little later to present day. Linneaus’s classification work, and Darwin’s theory of evolution follow on from some of the core realisations of this earlier period. Neither Linneaus’ work nor Darwin’s work make much sense if you don’t believe that animals (and plants) grow from eggs/seeds which came from the same species. It wasn’t until von Baer’s work in the early 19th century that the female egg was observed.