Re: Thermostats
I have a related gripe with boiling water. Furiously boiling water is exactly the same temperature as only just boiling water so there is no need to leave the gas on full power and fill the room with steam.
177 publicly visible posts • joined 27 Sep 2009
https://en.wikipedia.org/wiki/Tartrazine
Don't know how trustworthy this is but the wikipedia article says that tartrazine causes allergic symptoms in about 1:10000 people but the other 'well known' issues are all just urban legends. It might be a case of scared because they 'read it on the internet' so it becomes true by repetition.
Icon - well he might be drinking soda.
Gemini 8 had a uncontrolled thruster burn that spun the capsule upto almost 1 rotation per second - just imagine being in this and how hard it would be to function. Neil Armstrong (pre moon) was in command and somehow managed to get thing back under control without blacking out or otherwise being disabled by the spin.
Truely the Right Stuff.
I had a set of units that came back from customers as faulty but it was very hard to reproduce. I eventually discovered that it was due to a micro crack caused by a common event on these boards that only showed up when the device was in a certain orientation. When on my desk this was not the natural orientation and it worked fine but in the machine it was at 90 degrees and the weight of the sensor opened the crack.
Caused much head scratching until I found the pattern.
I had a battery powered scope which was ideal for such things - a lovely little bit of kit. More recently I was using a big old CRT scope and got zapped from it because the earth was disconnected, I know why because when it was connected it caused other problems.
Battery power is much better than no earth.
There are going to be some interesting decisions to be made on orbits of any LPS (I vote for LPS) system as there are no radiation belts or atmosphere which gives more choices but the moon has a messy mass distribution which means that more stationkeeping tweaks are going to be required as the orbit gets lower and magnetorquers wont work so there will be a increased fuel burn to maintain orientation. I suspect the answer would be proportionally higher orbits where each one can be seen from more of the moons surface. This is good for reducing the number of satellites and improving orbital stability plus do you really need a 20 satellite fix on the moon? Being between skyscrapers is wont be a issue for a while.
Lets add some maths
Radius of Earth 6380 km
Altitude of satellite 1000 km (random guess)
Diameter of satellite 10cm=0.0001 km (thickness of shell)
Area = 4*pi*(6300+1000)^2= 7e8 km^2
Volume = 7e8 * 0.0001 = 68000 km^3
At a density of 1000 kg/m^3 = 1e12 kg/km^3 (water) this has a mass of
Mass = 68000 * 1e12 = 7e16 kg
A falcon heavy can launch about 10000 kg so to make a 10cm thick shell around Earth at a height of 1000 km would take about 7e12 launches. I think we are safe for now.
(Please check my maths)
Maybe flotsam vs jetsam is relevant here. As it was deliberatly 'thrown overboard' it would be jetsam in which case NASA no longer owns it.
https://oceanservice.noaa.gov/facts/flotsam-jetsam.html
"Under maritime law the distinction is important. Flotsam may be claimed by the original owner, whereas jetsam may be claimed as property of whoever discovers it. If the jetsam is valuable, the discoverer may collect proceeds received though the sale of the salvaged objects."
The problem is more that people believe stuff they read on the internet from sources as unreliable as social media.
Schools should have compulsory courses on critical thinking and general how to identify poor information and this should be done early, no later than 10 years old.
Won't fix it but at least it is a start
Many years ago I was on a Twin Otter fully loaded with fuel drums. We headed off on the great white expanse but we were too heavy to get off the ground. After 10 mins or so of very fast bouncing and probably skipping over many crevasses we finally limped into the air. It was the EPICA project at 2892m altitude which can't have helped. Apparently there is now a station there (Kohnen) but it my time it was in the middle of nowhere with a high snow accumulation rate.
I once built a pendulum clock from PC components. The pendulum was hanging from the head arm of a HDD and used the coils to nudge it when it slowed down. The swing was monitored by a mechanical mouse sensor that incremented the clock on every swing and measured the swing speed by looking at the time taken to traverse the mouse sensor.
All done in discrete 74xx and 4000 series logic - lots of it.
Usenet was good in the 1990s, comp. and sci. groups were my lunchtime viewing and I even used Emacs as a reader. Took a break from Usenet in the late 90s and when I looked again the signal/noise which had been deteriorating for years had dropped to the point were it was not worth the effort.
I hate to think what it is like now.
Sad that it is gone but it had no defence against spam so once the threat of your university / company taking action against you if you made a bad post was gone it was doomed.
But is it wrong? Given publically available data to it the answer to 'an average woman of Afghanistan' is basically what it produced. It is going to be a merging of the images out there and 90% of them are going to be the iconic image so it is no surprise that the result is very similar to the original image but impressively facing towards the 'camera' which puts this in a different league to a simple copy. What about the other lesser influences to this image? Where do they stand? When it comes to copyright this is a minefield.
"500v supply by putting two adjacent 240v sockets in series." - Ouch, I see exactly how the thought process of your colleague went on this because if you think about it from a certain point of view it makes sense.
Sadly from another point of view connecting the live of one socket to the neutral of another would not have the desired effect!
I have also got to wonder why anyone was trying to get 500V from the mains. Wanting double heat from a portable heater maybe?
I left nearly 2 years ago after a epic fight and I still have all my virgin media kit in a cardboard box - locked TIVO, cable modem and a few RF connectors. I have tried to contact them to get them to pick it up but it always ends up with me being asked to give a 1..10 score on how good the pick up process was and the process ends there.
I might need to take it to the local tip to get it disposed of cleanly.
We had "the phone of doom". When a machine was on a long term test someone was given this phone overnight, the closer to work you lived the more often you had to take it. If the machine went wrong the phone rang and you had to go in to fix it and start it up again.
Always a stressful night (and unpaid) but luckily I lived a hour away so only had it rarely and doom never struck me.
I still have a box of virgin media kit awaiting collection from when I cancelled back in Jan 2022. It even includes a pretty good virgin media locked tivo box.
I have tried several times to get rid of it but there is no way to contact them and every attempt just ends up with them sending me a survey asking for a 1-10 score on how well the close of contract process went.
Answer is very badly. When I tried to cancel they kept finding dodgy reasons why they could not start the cancellation process or a few more days which would have pushed me into a extra month of billing just after hugh price rise. Eventually I got them to cancel before this date but by the end their excuses were getting increasingly desperate.
I was renting and at the time had paper electricity bills that came quarterly which I always paid on the time. After few years I received a red bordered final demand saying that the bailifs are due imminently. When I contacted them they said that I had not paid 2 bills in a row and looking back at my records I discovered that they are right and this was because I had not received any bills.
It turns out that in the small print of my last posted bill they said that they were switching me to a online account and this would be my final paper bill but I had only read the bill part of this and paid it without even looked at the next page full of text. They eventually admitted that I had never logged into the account, this final demand was not preceeded by any postal communication and they had not made it clear that they had decided to stop posting me bills and that I had not agreed to this change.
I was very stressed as I was just in the process of buying my first house so if this had landed on my credit score I would have been ruined.
x86 CPUs are working as hard as they can on instruction ordering, branch prediction and then there is the entire groups of spectre/meltdown/... that should be grouped and called precognition bugs all of which consume transistors and power. Most of this logic of this is known to the compiler so it should be able to take the one off hit in creating efficient code instead of letting the CPU do it on the fly.
Hmm - I think this has been solved before at least twice (RISK and dare I say it Itanium)
I must admit to 'fixing' a leaking pipe somewhere at the back of my toilet by spraying expanding foam at it. In my defence the leaky bit was in some boxwork which would be very hard to take apart and the actual leak was out of site and even touch. So I just bought a tin of expanding foam, pointed the nozzle in the general direction that the leak was coming from and pressed fire. Most of it fell off and created a big stalegmite but it stopped the leak. I know at some point many years away someone will take that boxing apart and see this and I will feel the much deserved derision.
The ST and I think the Amiga had a 68000 and this did not support preemptive multi tasking, this was fixed in the 68010 onwards.
I agree about the sound chip in the ST - poor at best.
There was a non preemptive multitasking upgrade for the ST written by someone with no connection to Atari - I can't remember who wrote it but it was a one man job in about 1990. I just about remember his (usenet) post when he said that this is free to the world. Can anyone remember who this was? I used his multitasking for a few years and it was pretty good considering the hardware.
I think I still have my Atari ST Mega 4 somewhere - it was the peak of the 68000 based ST range. I upgraded to this from a 1040STFM.
Had many good times with this machine and after my BBC Micro it was a huge step up. In the last few years of using this I used Minix as a OS which lead to SCO OS (a unix variant with a bad track record) and then Linux.
I learnt alot from this machine.
I bought a trivial low power 12V plug in from Maplins (RIP UK supplier of electronics kit) about a decade ago. I plugged it into my wall outlet and there was a big bang and the main 32A breaker tripped. I removed it and there was a notch missing from the copper so proving the well known truism that fuses blow after the damage has happened.
I took it back to Maplins for a replacement and insisted that they plug the new unit into the wall there before I accepted it. She did so with notable hesitation and a worried look but it was fine