Youtube Video: Is China’s Coronavirus the Next Pandemic?

My personal view of the coronavirus is that outside of China, the mortality rate might significantly rise above what it has now (which is already several times higher than influenza), just as it did with the swine flu pandemic in 2009 (which my sister barely survived, but luckily nobody else in the family got). My reasoning for this is – people in China were probably at least somewhat exposed to the said virus in its non-human-infectious form, or some of its less dangerous relatives, which would give them at least partial immunity. Once the virus spreads to populations that have no immunity to its or to viruses similar to it, it will become much worse.

Since it is a pulmonary disease, our whole family is especially susceptible and in danger, since all of us have asthma, my parents are elderly, my sister has already damaged lungs and my brother is a heavy smoker. I certainly hope not to encounter it, I already had viral bronchitis this year for two weeks and I did not enjoy it in the least.

Making Kitchen Knives – Part 14 – Straightening Curls

Last time I was working on this project, I had some very bad results from quench. This week I have finally managed to test one idea of correcting the problem and maybe prevent it from ever happening again in the future. And I am glad to say that it did work. Not perfectly, but the new process is definitively worth to use instead of the old one.

Here is first the comparison of the three worst blades before and after. As you can see, there are still some curls in there, but they are noticeably less pronounced and one blade is almost completely straight. They will still come smaller than intended out of the polishing process, I will still have to remove some material from the edge until I get to the straight part, but I estimate it to be about 1/2-1/3 of what it was before. On the worst blade, the curls went about 10-15 mm from the edge towards the spine, whilst now it is about 3-5 mm. That is a significant improvement, and I think that had the blades been quenched from a straight form, they would never have curled in the first place.

As I alluded to previously, the process that I wanted to use for correcting the blades is called plate-quench. It cannot be used for simple carbon steels. Only so-called deep hardening steels can be thus quenched, and N690 is such steel, according to some articles I found on the internet. Nevertheless, it is better to not have the internet at all than to believe everything you can read on it – the manufacturer recommends oil quenching.

So I have tested the process first on one blade that I accidentally broke when correcting an ever so slight banana-bend. When the broken blade hardened properly – which I have confirmed not only by scratching with my gauges, but also by breaking off a tiny piece of it – I went on with the curly ones. On one of these, I confirmed the hardening too by breaking off a tiny piece of the tip, with the remaining two I was satisfied with the scratch test only.

For the plate-quench are used two flat plates from either alluminium or copper. These two metals have very high heat conductivity and thus can cool down some steels fast enough for them to turn into martensite. Luckily I got quite a few nice slabs of alluminium on hand. And because I wanted to make the process a bit faster (despite not making time-measurements this time), I have made a simple prototype quench-jig.

It consists of two identical pieces of alluminium with a small hinge, and locking pliers. The hot blade went out of the forge between the plates with the edge towards the hinge. Then it was firmly clamped by the pliers to hold it straight. When it stopped glowing near the tang – indicating a temperature well bellow 600 °C – I dunked the whole thing in a bucket of cold water just to be sure. And just as last time, because it costs nothing, I have put the blades into a freezer straightway for a few hours before tempering them. None of the three blades cracked.

Not an actual quench, staged photo – sometimes I miss having third hand greatly. © Charly, all rights reserved. Click for full

It worked reasonably well and quick. I will definitively improve it and build a proper jig when the weather is nicer and I do not freeze my nuts off in my workshop. I will add a more stable hinge(s) and maybe even screw one of the plates to the pliers.


Another advantage of this process is no burnt oil gunk on the blade, no flames and no stinking oil fumes.

Yellowhammers Visit.

I had this visitor a few weeks ago, but the light was bad and I was unable to identify the species. Luckily my biologist friend was able to forward it to an ornithologist who was so very kind and identified the bird for me. So when yesterday they returned in good light, I knew what I am looking at.

The ornithologist also sent some bad news with the identification. He confirmed my subjective observation that there are significantly fewer birds. Some species are actually becoming rare – the whole genus Carduelis for example (greenfinches, goldfinches, siskins). This winter I have not seen a single specimen of these three species, whereas in previous years greenfinches and siskins came in flocks counting dozens.

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

And yes, we finally had a few cms of snow. This week seems to have been the actual winter, what we had before was merely agonizingly long and dark fall.

Bonsai for Beginners – Part 2 – Necessary Tools

I hope I will finally be able to do this series justice since I am starting to re-pot my trees this year. Part one was here.

You do not actually need some very sophimasticated or expensive tools to start growing bonsai trees, but even if you only aspire to have one, these are the essentials that you will need. If you have a garden or potted plants, you probably already have some or even most of them.

First – not depicted – flower pot(s). Bonsai are typically grown and shown in beautiful elaborate glazed bowls, proportioned to the tree. But ordinary flowerpot will do in a pinch – important is the plant, not the pot. Some trees can also be grown on a flat stone or a hollowed-out piece of wood etc. Anything that holds the substrate together will work, but if you intend to display the tree anywhere, the pot should be chosen accordingly. An ugly pot detracts from a beautiful plant. If you get your first bonsai tree in the form of one of the mass-produced little ones, you will probably get a passable pot with it. If you start your bonsai from a cutting or a seed, it will take several years before you need something more ornate than an ordinary flower pot. However, from the start you should keep one thing always in mind – for most bonsai styles the roots need enough space to grow to the sides, so wider and shallower pots are better than narrow deep ones.

And now for the tools on the picture, from left to right, top to bottom.

A container for storing all your tools. Whether you have one tree or many, you will usually need more than one tool at one time, so it is good to have them packed in such a way that you can take them all with you when needed, and neatly put them away when not, since they will not have any other use.

A tree balm. Either acrylic or wax/resin-based. You need something to dress cutting wounds. Acrylic-based balms are the best and some sort of ordinary acrylic paint will do too if nothing better is available. Wax/resin-based balms are perfectly OK for most conifers and for big trees, but some deciduous bonsai trees do not respond to them well, it seeps deep into the wood and can kill buds, even branches.

A mesh (plastic, glass) or pottery shards to cover the holes in the pot.

A wire. For holding the mesh over the hole and for forming the tree. Depicted here is thin steel binding wire, PVC coated. Alluminium or copper wires are better but more expensive and harder to get. A string will do in many cases, but it is more difficult to work with.

Root growth stimulator. You will need to cut roots, and in some instances, you will need to encourage the plant to grow new ones.

Charcoal. Best is low-quality charcoal from soft or rotten wood, even better one that was already lit and water-quenched several times. The reason for this is that such charcoal is very brittle and porous and can be easily crushed in fingers to a fine powder and applied to the cutting wounds. It is important for dressing bigger root wounds of all trees – it prevents fungal spores and microbes from entering them. For trees that excrete latex from wounds, it can also be applied to dry the latex quickly and seal the wound on branches and twigs too.

Bamboo BBQ skewers and chopsticks. To tease apart fine roots and comb out old substrate from the root ball when re-potting the plant.

Two pairs of pruning shears. They should be visually different, since one pair you will use for roots only, and one pair will be exclusively for branches. That is not only to prevent dragging spores from the dirt into the branches but mainly because the shears for roots will blunt faster and would tear the branches instead of cutting them neatly.

Pliers. The combination pliers will suffice since they can cut the wire too. But I have dedicated wire cutters as well.

Ordinary shears. You may need to cut leaves or very thin and fine twigs. Pruning shears are too coarse for that kind of job. Some very old shears are fine, and if you are able, grind the bevels to a steep knife-like angle.

A knife. Not only for grafting, that is improbable for a beginner, but it gets used also for cutting f.e. a piece of wood into a temporary spatula to apply tree balm.

A flat brush. To carefully clean the surface of the tree trunk without damaging the bark, to sweep away needles/leaves from exposed roots, and to tidy the surface of the substrate.

A flat hook. Or a very blunt knife or a spike or something similar to soften old hardened soil in the pot, to cut it away from the sides where it often gets stuck and to pry away more difficult root-tangles.

A trowel. Enuff said.

A substrate. Ideal substrate depends on the plant(s) you intend to grow – more on that when I will write about individual species – but most plants will survive in a substrate consisting of equal parts of coarse sand, high-quality topsoil (f.e. collected from molehills) and peat/compost. Bought substrates are OK, but I would recommend to mix them with soil and sand anyway, they contain a tad too much organic material. It is also recommended to heat any substrate, whether bought or self-made, to at least 70°C prior to planting to kill any germs it might contain. For that, you might need a tin pan and a baking oven, or a plastic bowl and a microwave.

If you start growing more trees, your toolbox will expand and no doubt you will buy some of the more beautiful and specialized ones. But all these will fit into a little bag and they are all you need to start. All the tools in the picture are ones that I am consistently using for over a decade by now, some even for several decades. None of them are expensive or difficult to get. Why buy a fancy tool, when an old one does the job just as well?

TNET 37 – Wish I Could Fly

I do not give names to my paintings, this is just an association that has popped in my head when I took this one out of the pile to photograph. The painting is 450×715 mm, distemper on hardboard and, as you can see, in rather a bad shape. That is the result of two things. Firstly, I did not have access to high-quality art supplies twenty-five years ago (and anyways, I lacked the knowledge to use them or the money to buy them) so it was done with the only distemper available at the local stationery store. And secondly, the painting hung several years in a room adjacent to a badly ventilated kitchen. The fumes from burning propane do “wonders” to everything in their vicinity. When I finally got round to buying varnish to help to stabilize the painting, it was already heavily damaged.

© Charly, all rights reserved. Click for full

And since I got nothing else to offer for a new open thread, let this be one. Usual rules apply – talk whatever, just don’t be an ass.

Previous thread.

The Last Time I have Finished a Drawing (possibly NSFW)

In 2007 we had a major blackout in our town, three days if I remember correctly. In the winter. So when I got back from work I literally could do only things that were possible to do by candlelight – reading and drawing. It was the last time I have sat down with a piece of paper and a set of pencils and finished a drawing from start to finish. The drawing is below the fold since it is possibly NSFW.

This is fairly representative of what I have drawn, in addition to fantastical beasts, dragons, and trees. And depressions. I hope to brush-up on my drawing skills and get back into it now that I am unemployed and a master of my own time for a while. I have a few unfinished paintings too. A few finished as well, but I did not get round to taking pictures yet.

The original is a bit bigger than A4 and is now unfortunately irreparably damaged from an incident a few years ago when workers repairing my roof shuffled stuff in my attic whilst completely ignoring my advice about strong winds in my area. So they stored the folder with all my drawings and sketches under an impromptu shelter that was ripped off by a wind gust during the next rain. I found out only several weeks later when everything was moldy and I could not even plausibly require the company to pay the damages. I tried my best to salvage what I could, but I lost most of my drawings at that time.
[Read more…]

Questionable Beauty of a Snowless Winter – Part 3

Last frozen patterns that I took pictures of. The second one looks almost like snow – it was over 2 cm thick fluff that built on the white surface of an old boiler that I still did not get to take off to recycling.

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

Poor Man’s Belt Grinder – Mark 3

My belt grinder has served me well, and for a hobbyist, it would be probably good enough. But since I am inching my way towards knife making not being just a hobby, I needed some significant improvement on it. And an opportunity luckily arose.

One of the good things about my previous employer was that there was an internal process for employees to get obsolete materials and equipment either cheaply or completely cost-free. I have used this opportunity quite often and got a lot out of it – I am well stocked in graphite and alluminium, I got precise analytic scales completely for free, and one of the last things I have managed to get was a variable frequency drive.

I was not able to haggle this one down to zero, it was a bit pricey even though used, and I also had to pay a bit to a professional electrician to connect it for me. I could get a new one for a bit cheaper if I capped it at the 1,5 kW that my motor has (this one can handle 5,5 kW) and took the cheapest one there is, but it was still a good deal even if it was not exactly a bargain.

And it works like a charm, even when I am not able to use anything more than the manual mode yet. Finally, I have the ability to change the speed of the motor as I need it, I can even reverse the rotation. I have tested it already and it is exactly what I hoped for-  finally I can work wood without burning it and I can sharpen tools and have a bit more time before the edge starts overheating.

I hope it continues to work well – I have great plans for the future. Multiple grinding wheels, a polishing attachment and, maybe, even a lathe attachment. The belt grinder shall not rest!

Questionable Beauty of a Snowless Winter – Part 1

Freezing temperatures have finally arrived in central Europe, we had -6°C a few days ago. Unfortunately, it was not accompanied by any snow whatsoever, not a single flake. However the rapid onset of frost after relatively warm weather has covered every stone, every piece of plastic or metal and every blade of grass and tree twig with ice crystals, so I took my camera and made a few quick pictures.

When I was a kid, usually there were at least twenty cm of snow outside at this time.

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

Gingerbreads of 2019 – Part 5

Even more Easter Eggs. The last batch from Easter, next will be Christmas.

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

© Charly, all rights reserved. Click for full

Behind the Iron Curtain part 34 – Prices

These are my recollections of a life behind the iron curtain. I do not aim to give a perfect and objective evaluation of anything but to share my personal experiences and memories. It will explain why I just cannot get misty-eyed over some ideas on the political left and why I loathe many ideas on the right.


There is a lot of sentiment now about that during the Communist Party’s reign everything was cheaper and thus living was by default better. But that is not something I wish to talk about since it is really difficult to evaluate. Statistics about income from that era are not particularly reliable and one cannot directly compare today’s prices with prices then.

What I want to briefly mention is how wares were actually priced – centrally. Every piece had its selling price printed on the packaging straight from the manufacturer, and it was given. There was no such thing as “a discount”, there was no haggling and no local fluctuation of prices. There was also no sales tax. What item X cost in the center of Prague, it did cost in the smallest mountain village as well, and what it said on the packaging was what you paid.

(One of the biggest cultural shocks during my visit to the USA was local sales taxes. You go to the store, you pick up an item for $ 4.99 as per label, and at the counter, you are asked to cough up 6.00 or some such, which I found, and still do, to be utterly idiotic.)

Not only wares were thus priced, but services and rent were tightly regulated too. I do think that such strict regulations d were a bit too inflexible, but on the other hand, what is happening now is the opposite extreme. For example in Prague near the main tourist routes, some ware can cost several times as much as it does just a few streets away. Predatory landlords are a thing now, thriving on the welfare state that is supposed to help their customers, etc.

I do not think we have found the proper balance yet.