Luna the cat and a bloodbath

 Recently I was away from home for a short while. When I was away I received the following text. I found it again when I was clearing out the inbox on my phone. The text (or at least, the vision I imagined) is so good that I thought I would share it for posterity.

Luna is a cat.

Ok luna opened sachet tomato ketchup last night like bloodbath in kitchen!!!!

[7th October 2023 12:23]

Rendered into better English, with some punctuation. 

Ok. Luna opened a sachet of tomato ketchup last night. It was like a bloodbath in the kitchen!!!!

My mind boggled at the imagined image. I'll leave you to do the same. Fortunately our kitchen has a tiled floor.

[28th October 2023]

When you get to our age: ailments, lathes and the river

Hi Mike, Good to hear from you! Just recently, for the first time, I find myself wanting to prefix what I'm going to say with "when you get to our age..." (wygtoa). It feels strange, and is really a bit unwelcome. I hope I didn't sound like I was nagging but (wygtoa) several of my friends and acquaintances have been suffering from ailments both serious and minor and sometimes I become just a little anxious that someone is in a poor state and I don't know about it. With that said, the last thing any of us needs is someone else going "are we there yet?", or similar, particularly if you are feeling out of sorts.

Sorry to hear you've been poorly. The flu/Covid you describe sounds nasty. I understand what you say about "unable to concentrate". I've experienced that myself, though fortunately not recently. Another symptom I have experienced is a feeling of "not really being there/present". I think that fancy name for that is "dissociation". That wasn't actually unpleasant, but it isn't something I want to repeat either. On the other hand, on a couple of occasions I think I've experienced minor hallucinations - that was just weird, "dissociation PLUS strange sensations". People pay a lot of money for experiences like that! As far as I'm concerned they're welcome to them.

I particularly understand the "not being able to read" bit. There was a brief time in his later years when my Dad had a spell like that. At the time, I felt really sorry for him because it took away a genuine simple pleasure. Fortunately the effect was due to diabetes and got fixed, so it was all ok in the end. I think he was re-reading one of the Brother Caedfael (spolling?) stories the week before he died.

I'm still waiting to pick up Rivers of London again. I simply haven't been in a bookshop recently and my library haven't come up with the goods yet. I've been wondering (in general) about graphic novels. I may give one a go (maybe even a RoL one). I think they are a legitimate art-form (like comics, plays, TV etc) but maybe suited to a particular audience, so I note your comments and accept that graphic novels may not be for me. One of the things I like about RoL is the discriptive work and the backgrounds and, of course, that will likely be lost in a graphic novel. I think I'm someone who falls into the category of "I prefer listening to plays on the radio to watching movies - the pictures are better!" Talking of plays on the radio, I was speaking to Chris Freemantle over the internet yesterday and he said that he had been "...listening to a Radio Four play...". I don't think I was fully paying attention to him, or perhaps it was my dodgy hearing, because just for a fraction of a second, I thought I had heard him say "...listening to radio foreplay...". I'll leave your imagination to fill in the gaps, because that momentary misunderstanding certainly had my mind boggling.

Well done for venturing out "on foot"! It's something I don't do enough of. If I was over there, I would be tempted to offer to join you. My exercise is mostly my cycle down to town most days to pick up a newspaper and minor groceries. That, and the same trip to the Men's Shed and then the pub two nights a week. Purchasing the bicycle was one of the better things I have done since coming full time to Ireland, and it was a complete whim. 

Tomorrow, at the Shed, my task of the evening is to connect two pins inside a push-button on/off switch on a lathe. It isn't "latching" as it needs to and I think the problem was that I had misunderstood the details of the wiring (part of the problem is retrofitting cheap Chinese components to ancient British equipment, with little or no documentation for either. The lathe is a small Myford). Internet diagram to the rescue. At tea one evening I was pleased to announce: "Three bits of good news: the lathe motor runs in both directions, there hasn't been a big bang, and I'm still alive!" If the "latch" works, then all I have to do is re-route some of the wiring and thoroughly clean the lathe (it's in a terrible state). I'm sure there will be other things to do as well.    

My other exercise is walking down to the river behind my house. You couldn't really call that a proper walk, but I enjoy it, and it's so convenient. I remember telling you about it. Making the gateway was another whim. The original reasoning was simple enough, the gate gives me access to cut the back of the hedge, but the effect has been much greater. I now go down to the river several times a week (weather and inclination permitting). Regarding ground conditions: one of the effects of making the same walk regularly is that one becomes aware of changes. Topsoil where I am is clay and the underlying ground is some sort of limestone or maybe shale (my geology is a bit dodgy). It has been a wet winter, even my local standards. The ground was very squidgy, even waterlogged but is now beginning to dry out. The river itself is changing. It was surging and opaque, like milky coffee, but yesterday the surface was flat enough, and the water clear enough, for me to see the rocky bottom in places. And I saw one or two bees (good) and today I saw a pair of swallows outside my house (that's even better). I have still to go down to the river today.

I'm going to break off there. I have to pick up the newspaper and I have a couple of small purchases to make in town. Keep in touch, even if it's only to say "I feel a bit crap, but I'm still here". It saves me worrying and prevents me from being a nag. Tell me about  any future walks.

Regards,

Tom

(17th April 2023)

Redcar Coke Ovens - January 1980

I don't remember a saharan wind but I do remember the wind from another time.

In 1980 I was "doing the rounds" as a trainee engineer (Grade MM0, Middle Management Zero). It was three months here, and three months there and so on. "Here" moved about quite a bit, but in January 1980 it was the coke oven plant at Redcar. You can still find the remains of the Redcar blast furnace and coke ovens by selecting the birds' eye view on Google maps, just a little to the North West of Redcar town.

It should have been a good time (I'm perverse enough to have a soft spot for coke ovens), except that between January and April 1980 was the Steel Strike. It was not a good time. Each day started with 15 miles across the North Yorkshire Moors (which could be pleasant), then negotiating my way through a picket line and then a further mile through the sleeping works to the site. The works had been built on reclaimed salt marsh and there is nothing between it and the the North Sea but the dunes at Coatham. Fortunately it didn't really snow while I was there, but there was constantly snow on the wind. It was bitterly cold.

I can bore for 3 countries on coke ovens and blast furnaces, and I'll spare you the details. Both are strange things, like caged dragons or demons. One difference is that a blast furnace can be put to sleep and woken again. It is not a desireable thing to do, but in this case it was done for 3 whole months. Imagine waking a coke fire from the embers. Coke ovens are not like that - they cannot sleep. They can be "turned down" but if production stops then the ovens are quickly destroyed and have to be rebuilt. So, production continued on the ovens. Several times a shift an oven would discharge tens of tonnes of incandescent coke into the air. The inside of the ovens is extremely hot (up to 1400 deg C), and the outside is still hot enough to damage the soles of your boots if you stand still too long in one place. The atmosphere between workers and management was one of tension and resentment. To top it all, the ovens (which were almost new) were suffering from serious technical problems. The air stank and all the time the wind was blowing in from the sea, carrying snowflakes.

It was about then that I decided that, right or wrong, the politicians had decided that they didn't want a steel industry and that the best thing I could do was leave before everything came to a sad end.

On a brighter note, I enjoy my place down by the river. I wish I had found it years ago, but it wasn't the time. I don't expect to see kingfishers. I think the soil is wrong for them: clay rather than sand. On the other hand, I have found myself studying the water. I find the patterns formed by the eddys fascinating. They are both chaotic and predictable and they change from day to day with the state of the river. There is one place where a branch sheds little vortices and another where there is sometimes an area of turbulence like plaited hair. I'm pretty sure Da Vinci drew something like that in one of his notebooks.

On an even brighter note, Noreen and I are off for a couple of days in Bantry. Two nights in a fancy hotel. I'm looking forward to roasting myself in the sauna.

I've got another letter to write before I shut things down, so I'll end there.

Incident in O'Brien Street

Today is a day for interesting occurrences which I feel are worth noting down.

I was driving my car, waiting on O'Brien Street to turn into Earl Street (which afterwards becomes Freemount Road). A large earth mover (Volvo, 4 wheels, hinged in the middle) turned left out of Earl Street. A car on O'Brien Street moved forward and blocked my turn into Earl Street. At first I was a little annoyed, but then the driver started gesticulating wildly a the driver of the pickup truck which was just about to follow the earth mover. There was a large piece of metal, invisible to the driver, which I suppose had fallen from the earth mover. The driver and passenger of the pick-up got out, retrieved the piece of metal and moved it to the side of the road. I exchanged friendly waves with the driver of the car which had blocked my path. He had done the right thing for all of us. He only had a moment to make the decision too. 

(17th September 2022)

 The Grounded Star

I was standing outside on the drive, near the front outside tap, when something caught my eye. It was a bright light shining from the asphalt pavement. I could keep the light sparkling by walking towards it, keeping the sun over my shoulder. When I reached it, I stooped down and picked it up. It was a tiny fragment of glass, an irregular cuboid or spheroid. I am holding it between the forefinger, second finger and thumb of my left hand even as I write. It is pale green, transparent tinted glass, a remnant of the incident with the rear window of my car. When I looked on the ground nearby I could see other similar fragments, each one a little facetted shape. I had not noticed them before now except that I saw this one - barely 2 mm across. Each one is a tiny gem, a facetted jewel, a grounded star.

I thought about how this incident could be incorporated into a detective story: someone noticing a fragment of broken glass on a tarmac drive, noticing more fragments and deducing that a broken car window had been nearby. I'm going to throw the glass away and get on with my day.

(17th September 2022)

Floaters – Onward to Mars etc

Floaters – Onward to Mars etc

In an earlier exchange I convinced myself that a dirigible on Mars was simply not practical. The issue is the low atmospheric density. It is much easier to design something to float in a dense medium. You and I can swim quite easily in water, but have difficulty flying, well, I do anyway.

The reason I am in favour of gas balloons is that once they are in flight they do not need energy to maintain them there. That makes them economical. This does not rule out hot-air (or other gas) balloons or gliders but they are issues for another day.

I don’t give up easily, and I thought I would investigate the possibility of using balloons on other bodies.

Bodies I investigated briefly and rejected:

Body:            Atmospheric Density:    Composition:

Mercury        “tenuous”                        -

Mars            0.02 kg/m3                        95% CO2

Ganymede    “micro pascals”                -

Europa           “tenuous”                        -

Jupiter            90% Hydrogen.             “Hydrogen and Helium in roughly solar proportions”

All the data is sourced from Wikipedia or other basic websites because I’m lazy.

Balloons are favoured by dense atmosphere composed of gases with a high molecular weight. Low gravity helps too.

Balloons are not practical on Mercury, Mars, Europa or Ganymede because of the low atmospheric density.

Jupiter is an interesting case. The atmosphere is so deep that there will be a wide range of density. The composition being mostly hydrogen means that something relying on pure “gas buoyancy” will not work (because you can’t get less dense that Hydrogen). On the other hand, the pressures are so high that the penalty for solids is less. Jupiter needs its own special, radical approach. Jupiter is not really rejected, but it needs a completely different approach.

Venus

On the other hand, gas balloons may have real potential on Venus!

Surface Temperature:    464 deg C

Pressure:                        92 Bar

Gravity:                          8.87 m/s2, 0.904 g

Atmospheric Density:    65 kg/m3

Composition:                  96.5%

If we assume ideal gas laws apply and the Venusian atmosphere is entirely CO2, then the density of a gas is simply going to in ratio to the molecular weight of the gas relative to CO2 (the other conditions, temperature and pressure remain constant).

This gives us the following:

Density of Atmosphere:                                65 kg/m3

Lift from 1m3 of vacuum:                            65 kg

Density of H2 at same conditions (2/44)      2.95 kg/m3

Lift from 1m3 of H2 at same conditions.      62 kg

Density of He at same conditions (4/44):      5.91 kg/m3

Lift from 1m3 of He at same conditions:       59.1 kg

There you are! If my sums are mostly right, that means that the high pressure and CO2 atmosphere means that on Venus 1 m3 of enclosed Hydrogen can lift 62 kg of load.

The Venusian atmosphere contains Sulphuric Acid. I would propose manufacturing hydrogen “in situ”. Possible routes are: bringing a reactive metal like lithium with you and reacting it with sulphuric acid, or breaking down the acid with energy. Suddenly making this practical becomes a materials-science problem.

Next Steps:

I prefer “back of a beer-mat” to “back of a fag packet” but that exercise convinces me that balloons are worth investigating for Venus. Next stage would be “back of an envelope”.

Do you know anything about aerodynamics and lift? (because I don’t). Are you aware of any equations I could use in a similar way to screen glider devices for different bodies?

I think gliders will be impractical on Mercury/Europa/Ganymede because of the low atmospheric density. I think they will probably either have to move far too fast or be vast. I’d like to do the sums for Mars (just to “show it won’t work”).

On the other hand, hot-“air” balloons and gliders (or “fish”) might be really interesting for Jupiter, but I’m still working out where to start. Any suggestions?

(Original 5th June 2021)

Drain problem in Cork City - Titan, Ceres and Dwarf planets

 Hi, Yes I though the Titan thing was good. As for the moons… well, it’s understandable. Our generation called Pluto a planet – the category of dwarf planets didn’t exist then, and all those moons are simply too much to remember. 

Titan is one of several places which look well worth investigating. In a perverse way, all these moons and some of the dwarf planets: Ceres and even Pluto, may make better targets for human occupation than planets. They are deep space but with a surface and no gravity well. https://en.wikipedia.org/wiki/Ceres_(dwarf_planet) Actually, the Solar System is looking more interesting than it has, but not in the ways or in the places we expected.

And… it hasn’t been a good week for me, and though I’m through it ok, I may be distracted suddenly for a while. 

On Wednesday evening, Noreen got a phone call from Margaret to say “there’s sewage in the yard” of our cottage down in Cork City. A photo was enough to confirm the issue and in the time it took to collect a few tools (overalls, gloves, drain rods…) and a change of clothing I was on my way (40 miles to Cork City). 

By 01:30 I had the mess cleared and had established that while the loo and shower-room drains were working satisfactorily, the gulley for the kitchen (which was the source of the effluent), was blocked. There had been things in that effluent which had not come direct from any kitchen and certainly not ours, including an almost complete sausage! No, I do not know what variety; it was like a length of garlic sausage with a reddish skin. The mess cleared up and it being possible to use the loo (but not the kitchen sink) I washed and went to bed.  

The following morning, Noreen (who fortunately is on vacation from school) was down at 09:00. While I started trying to clear the blockage, Noreen started on the internet and phone. In not so short order she went through: Irish Water, Cork City Council, 2 drains companies and even the Gardai (police, because we needed to get access to the house next door). Everybody was very helpful, but there were issues all along the way. Meanwhile, I bailed and “plunged” and groped.

By a miracle, “plunging”, persistence, groping in the darkness and with the use of chemicals, there was water movement by about 15:00 and by 16:00 I had the gulley draining in a satisfactory way. We had managed to resolve the immediate crisis for about EUR 30 on parking, EUR 20 on drain cleaner and whatever we spend on petrol. After I’d demonstrated the results, I washed up, we all shared some tea and a bun, and Noreen and Margaret went home, while I remained, to enjoy a TV dinner and a single can of strong cider. I went to bed early and I slept like a log.

The following day, I did a survey of my drains and the area. Compared to the previous night I felt amazingly relaxed. In the early afternoon I had a visit from someone from our preferred drains company. The bloke explained that we had two issues: 1) No rodding/jetting access and 2) No vent to relieve pressure from the sewer. The solution is going to have to be removing the loo pan and using the access into the sewer for inspection with an endoscope and then digging up the yard (guided by  the endoscope results), and then jetting and fitting a small inspection chamber. Really what is behind all this, is that I have a house which is over a hundred years old and the foul drainage has developed by a process of accretion.

I’ve fixed the immediate crisis, but now I have to take control of the project (because that is what it has become). Of course, the screws holding down the pan are badly rusted. I’m going to investigate removing the bowl but I’m reconciled to hiring a plumber and I know that the usual solution in these cases is to break the bowl – it’s easier and cheaper. If I get someone else to do the work, I will get them to fit easily removable screws and a service valve on the cistern at the same time (to save the need for draining the cold water tank in the future).

I’ve now got an excruciatingly large scale map (stolen from the Irish Gas website) of the relevant houses, and the results of my survey. Tomorrow evening I will investigate the loo pan and then we will move on from there. 

I may be busy for a few days…

Cheers, 

Tom

Trying to stay out of the brown. Onward to Mars, or Titan!   

(Originally posted 17th June 2021)

From: pink582 [mailto:pink582@btinternet.com] 

Sent: 10 June 2021 10:54

To: Tom Gillies

Subject: Re: Titan

Hello Tom,

thanks for doc about Titan, I may watch others in the series. When it comes to the moons I get a bit hazy....when there were only a handful of moons knowing their names seem to make sense but when you get 53 confirmed moons plus 29 other likely candidates....well I lost the plot.

two things did come out of the doc for me...1) the magnetic field of Saturn itself is strong enough to protect the atm of Titan from solar wind for 90% of the time...I also guess the solar wind is less dense out there.

2) very thick atm...if you want a fast trip to Saturn slowing down won't be so difficult...reference ballute idea in 2010 movie.....may be you could rig a past both through Saturn and Titan.

All the best

Jeff

------ Original Message ------

From: "Tom Gillies" <gillies.tom@googlemail.com>

To: "Jeff Pink" <pink582@btinternet.com>

Sent: Wednesday, 9 Jun, 2021 At 19:32

Subject: Titan 

I’m sure you will be interested in this, and I’m going to check some figures tomorrow

https://www.youtube.com/watch?v=qGy4uyHVUYA 

Regards,

Tom