Saturday, 25 March 2017

Come on, baby, light my fire

There is increasing resistance in France to the routine use of weedkiller products like glyphosate, with ideas like a complete ban from 2020 being mooted.  One of the advantages of weedkilling chemicals in general is that they're cheap and easy to use.  You can get enough for some 500 square yards, that kills the weeds and stops seeds from sprouting, in a single spraying that lasts for a whole growing season, for about €20.

In the light of the debate, various other techniques are being tried out.   I have seen council workers and plant nursery owners clearing weeds from gravel paths and raised beds with a steamer.  The steam kills the plant above the ground, and hopefully, the heat is enough to kill a proportion of the roots and seeds in the ground.  Uses quite a lot of energy, although I don't know how it might compare with the production, transport and sale of glyphosate.

As an alternative, you could use this compact gas burner.   To you, squire, and I'm cutting me own throat, a mere €1,490.  Seems a bit expensive to me; you can buy a very nice lawn mower with a complicated, 4-stroke internal combustion engine for a couple of hundred euro, and this burner looks very simple by comparison.

It has a line of burners mounted on a metal frame, plus a shelf on which you can fix a big bottle of gas (not included in the price).  You fire it up, and walk slowly along while it burns the weeds and roasts their seeds.

It even has a little shelf on the back for the fire extinguisher, in case of unfortunate events.  Handy that.

Thursday, 23 March 2017

Glycerine and physics

Recently I read a book by David Bohm called Wholeness and the Implicate Order.  I don't pretend to understand all of the mathematical physics developed in it; it is 40 years since I did any of that - time enough to forget, and to get out of date.  He presents a case for the existence of "hidden variables"  (an idea that had been discounted) that might underpin the randomness of quantum-level physical observations.

There were a couple of related things in it that got me thinking.  The first is an analogy he drew between the physical world and our perception of it, as displayed by a simple experiment.

You take a large diameter cylinder of glass, put a smaller diameter cylinder inside it on the same axis, and fill the gap between them with (transparent and viscous) glycerine.  If you put a dot of dark ink on the surface of the glycerine and spin one of the cylinders, the dot will gradually stretch out until it becomes too thin to be visible.  But you can turn the cylinder the other way, and the dot re-appears, then disappears again as you continue.

So you can draw a dot, spin the cylinder, draw another dot next to where it was, spin again, repeat several times, until they are all invisible.  Spinning the cylinder back again gives rise to the impression of a dot moving along the surface.

You can expand this idea into different sizes and colours of dots, spread out in 3D in the glycerine, spining the cylinder until you end up with a grey goop that, none the less, contains, in a meaningful way, the lines of different coloured dots you have drawn.  The author calls this the implicate order, and posits it as analogous to the implicate order of the physical world, of which we see only the observable elements that develop through time.

It's easy to see that disturbing any part of the grey goop has an effect spread out through time and space that is difficult to predict.

He then draws an analogy with music.  Our appreciation of any given note, chord, phrase, theme, and our reactions to it, emotional and physical are all dependent on other parts of the music, some of which appear only in the future, others resonate in our memory of what has played out before.  That is, in listening to music, we perceive directly, an implicate order.

Is this why mathematicians like music?  (Related)

Tuesday, 21 March 2017

Carnival while you can

Arnage is a suburb of Le Mans, fairly heavily industrialised.  It has a residential quarter where they traditionally hold a carnival parade this time of year.  Our little band of flute students teamed up with some local players, and we took part in the parade.  It was a little cold, being March, but a good time was had by all.

Carnival parades in England are, in my experience, light-hearted, but well-organised and managed.  This one seemed to be more on towards the pantomime end of the scale, but no-one cared.  There were bands of musicians playing anything from traditional music to snatches of Led Zeppelin, people dressed as witches (the theme of the event), stilt walkers, people juggling flaming torches, lots of ballons, traditional costumes, and goodwill.

I have not participated in this event before, so I'm having to rely on information that was passed to me, but apparently the parade this year didn't weave in and out of the side streets as it usually does, because the anti-terrorist security would have been too difficult to manage.  I'm also told that many similar events in the region have been cancelled since the concrete barriers now required are too expensive for many small towns' budgets.

There's a big music festival held annually at Bais, not far from us, with multiple performing bands, street musicians, food and wine, all taking over the town centre.  I have played there a couple of times.  The fate of this event is being currently debated, as they are pricing up the anti-terrorist security.

Sunday, 19 March 2017

New museum

It was nearly 50 years ago that prehistoric cave paintings were discovered in one of the caves just down the road from us.  Apparently, it was somewhat of an accident; the cavers were on their way out of the cave, and had to queue up at a narrowing of the passage.  The last one, standing around waiting, happened to look back and his lamp caught the first of several images on the wall.

Some 30 years later a plan was hatched to open a museum to exploit these findings and put them into context for the public, and after 20 years of administrative gestation, a couple of years of construction and nearly 2 million euros of taxpayers' funds, the museum opened to the public this weekend.

We went to an avant-première that was offered for free to locals.  The museum is pretty good.   It covers the natural history of the area from geological time to the present, and the cave paintings and other aspects of human habitation are explained in this context.  The centrepiece is a big cinematic display of a computer model of the cave interior, that you can navigate using a joystick and buttons, in the manner of computer games like The Elder Scrolls or Half Life (complete with sounds of pattering feet when you move).  Nothing to shoot at, though.

Everything has to be 'ludique' these days; 'interactive' is perhaps a good translation, although dictionaries will give you 'playful'.  As well as the computer game cave navigation, there are, for example, reconstructed human and neanderthal skulls, mounted on shafts where you can turn a handle to make them spin.  It saves walking around the case, I guess.   You can also stick your head in different holes in a cupboard to experience the sounds and smells of different local vegetations, which struck me as interesting and innovative.

There is a fair number of security cameras.  I didn't realise, but apparently, some of the exhibits are worth several hundred thousand euro.

The explanatory labels were in English as well as French, with only a few niggly translation faults.  A pendant made from a pebble was described as a pendant on pebble rather than simply a pebble pendant, for example.  These were small faults in a generally well-presented exhibition.

All in all, a decent, little museum; we'll definitely recommend it as a worthwhile visit to the guests who come to stay with us.

Thursday, 9 March 2017


Well the DIY project started in February is still ongoing, with some progress having been made.  The sliding doors are in, and the vertical dividers inside the cupboards are in place, as are some shelves, sliding drawer/baskets, and hanging rails.

The old doors have had a lick of paint, though the curvy top looks out of place and will probably get changed.

The floor remains to be done.

Wednesday, 8 March 2017

Limoges - the junk shop

I'm not sure that "junk shop" is the politically correct term, but it's one that my father would have used, in complete innocence.  And it certainly applies to this "troc" that we chanced upon just outside of Limoges.  It was vast and full of junk.  It was on the way to a poreclain shop and factory just a bit upstream from Limoges on the Vienne.  We bought some porcelain serving plates there, but the junk shop was interesting too.

I mean, where else can you buy second-hand books for a euro the kilo?  There was an early C.J Cherryh book translated into french, but I'm not that much into sci-fi and Anita decided not to buy it.

That table in solid wood, described as a monastery table, was rather nice.  At €450 I'd have bought it on the spot if I had had the means to transport it.    But on the basis that you can't leave Limoges without buying some porcelain, Anita bought a cat.  (The serving plates don't count, cos they were for the gîte).  Here it is.  One euro from the junk shop.

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