Incorrect Post! Pendulum Clocks Do Not Perform Well At Sea Because Their Regular Swinging Is Easily Disturbed

Incorrect post! Pendulum clocks do not perform well at sea because their regular swinging is easily disturbed by a ship’s rocking motion. John Harrison, inventor of the first seaworthy clocks for determining one’s longitude, made his first two models with spring-loaded dumbbell oscillators and his later two models with coil-spring balance wheels. I must confess, though, that none of Harrison’s clocks are as cute as this one.

This website has great technical animations of the Harrison clocks’ mechanisms, and the book Longitude by Dava Sobel provides an excellent and entertaining historical account of their development.

lankyhorologist - Sometimes I post things.

More Posts from Lankyhorologist and Others

7 months ago

reviews on famous novel "don't create the torment nexus" are in!

one reviewer gives a one star review, saying, "i can't believe the writer would let the torment nexus exist in this world. doesn't he realize how awful the torment nexus would be in real life?"

another reviewer, with a two star review, says "yeah, the book was okay, the characters were all great, but i just can't get over the torment nexus. why is there such a terrible thing? don't they realize they'd be better off without the torment nexus?"

a third reviewer gave five stars, saying "i'm glad this book was written. they really need to create the torment nexus, that would really improve civilization by a lot." in the comment replies to this review, the reviewer indicated that this review was not sarcasm.

overall, "don't create the torment nexus" has a rating of two stars. find it in these stores......

2 years ago

joe biden appoints weird bug to be in charge of the night time is one of my all time fav images ever

7 months ago

At this point, if donald trump announced that he was appointing jk rowling to the newly-invented position of Federal Investigator of Biological Fairness in Sports, I wouldn’t bat an eye

1 year ago

Pangaea was wasted on the dinosaurs. Imagine the railway network.

8 months ago

All cells with mitochondria have a nucleus, all cells with a nucleus have mitochondria (or denegerated former mitochondria). It's not obvious that this should be so. In general, you should get branching after every trait (ofc this isn't always the case). If organisms with trait A are successful then there should be enough of them to branch. If they require trait B to be successful, trait A shouldn't have reached fixation in the first place, unless they were both caused by the same genetic modification.

Nick lanes theory, in the vital question, is that the mitochondria *directly* caused the development of the nucleus. If you're an archeon with bacteria living inside you, and one of them dies, it's membrane will dissolve and release its genetic material. You're an archeon, so you're used to doing lateral gene transfer, and will copy it's code into yours. This code has a poison and it's antidote

Bacterial genetic code has self-replicating parasitic genes. these genes are adapted to their bacterial host and splice themselves out before transcription. bacteria face strong selection to pare down their genome, so they dont have very many of these. but if you suddenly acquire a huge amount of bacterial genetic code, the parasites therein, not adapted to you, will put themselves in all sorts of bad places. then, because you dont face very strong selection, if these codes mutate in a way that breaks their ability to copy themselves, and splice themselves out before transcription, youll have a bunch of faulty genes. these dead regions are called introns. this is a huge problem! you can develop a protein to splice them out "manually", called the spliceosome, but it works slowly, too slowly to get them all fixed before they reach the ribosome to be made into proteins

HOWEVER, this bacterial code will also have a bunch of genetic code for bacterial membranes. the archeon will start producing a bunch of extra membrane enzymes, which will go around producing extra membranes. without adaptations to handle these, theyll just build up. around where theyre produced. lipids naturally form into closed surfaces in solution, so you'd end up with a bunch of lipid "bags" around your genome. but those bags are the solution to your intron problem! they impede the diffusion of the rna from the genome to the ribosome, giving the spliceosome time to work.

eventually (its theorized) these lipid bags evolved into an enclosed double membrane with pore membranes, but during mitosis they split into discrete lipid bags again!

2 years ago

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2 months ago

When I was 3 years old I went to a preschool that had this little green crocheted crocodile finger puppet that was my absolute favorite toy to play with of all time. I named her Chelsea, because Chelsea starts with C and crocodile starts with C and more often than not wild animals in fiction aimed at kids have names that start with the same first letter as their species. I played with Chelsea every day, because she was my favorite toy, and because the other kids weren't really interested in her, and also because I eventually started to hide her in a special secret spot in the room so no one else would find her before I did. She was so beloved by me that when I graduated from preschool, my teachers gave Chelsea to me permanently, because it was clear no one else would ever love that little crochet crocodile as much as me anyway (in part because I hid her). They waited a few weeks after I graduated before doing it, too, and sent Chelsea with some post cards as if the crocodile had been on a whirlwind "travel the world" vacation before deciding to come live with me.

And Chelsea remained my favorite toy all through my childhood. There were others I loved nearly as much, like my Imperial Godzilla and the big red T.rex from the first Jurassic Park toy line and my tiny knockoff plush Charmander, but Chelsea always held the place of honor in my heart. She was my absolute favorite toy.

I kept a lot of my favorite toys through adolescence, even if social pressure eventually got me to give away a lot of them (and some, y'know, broke). That's obviously not surprising to you if you've followed my blog, since I still collect toys into my adulthood. But it's important to note because while I know I made a conscious effort to never throw out Chelsea every time I pared down my collection... at some point, she went missing.

I became aware of it when I graduated from high school. I was feeling really emotional about leaving that stage of my life and, y'know, becoming an adult and shit, and in that state I decided to find Chelsea to reassure myself that I hadn't entirely left childhood behind. But Chelsea wasn't there. No matter how hard I looked, I could not find Chelsea anyway.

And that was, like, devastating, because the only explanation was that somehow, at some point, I had accidentally tossed her out with some other "childhood junk" while trying to grow up and be responsible in my teen years. I had literally thrown away my childhood in a careless attempt to be more grown up.

Of course I knew she was just a toy - nothing more than some yarn twisted together in the loose shape of a crocodile, lifeless and soul-less and more or less worthless in the objective light of day. But she was also Chelsea, my best friend since i was three, my stalwart little pal, a source of comfort for most of my life at that point, and I had just... tossed her out! Like garbage! What kind of person was I becoming if I could do that to my best friend?

I was very visibly distraught, and my mom noticed. Being very crafty, she tried to find the pattern for Chelsea so she could knit me a new one. The problem is, she had no idea where to find said pattern. She checked all her books of crochet patterns, and when that failed she tried the internet, but no matter how hard she looked, she found nothing.

So my mom found the next best thing.

When I Was 3 Years Old I Went To A Preschool That Had This Little Green Crocheted Crocodile Finger Puppet

The original Chelsea was a tiny finger puppet, and I had "met" her when I was three. Well, I was eighteen now - shouldn't Chelsea have grown too? And as has been established, this crocodile was fond of whirlwind vacations. My mom found a pattern that looked as much like Chelsea as possible while also being a much bigger crocodile, and gifted her to me before I left for college - to show that while we can't stop the flow of time or how it changes us, that doesn't mean we have to leave it behind.

And yeah, I decided to believe it. That's Chelsea now. Yeah, I know that in reality it's a completely different set of yarn made by my mom rather than... whoever it was that crocheted the original Chelsea, but then, Chelsea was never really the yarn. She was the feelings I put into the yarn, you know? So that's Chelsea, all grown up, and still my most prized toy.

...

Flash forward... Jesus, eighteen years, holy shit. A few weeks ago I saw a post trying to identify a different crochet crocodile pattern, and thinking it was cute, I decided to try and look for it on ebay and etsy, just to see if maybe I could find it. I didn't, but do you know what I found instead?

When I Was 3 Years Old I Went To A Preschool That Had This Little Green Crocheted Crocodile Finger Puppet

A very familiar crochet crocodile finger puppet. An intensely familiar one, you might say. Of course I bought it. And of course I asked the seller if, perhaps, they might have the pattern for it or know where it came from (they did not, alas). And after a few days, she showed up at my house.

When I Was 3 Years Old I Went To A Preschool That Had This Little Green Crocheted Crocodile Finger Puppet

She's not Chelsea, obviously. For one thing, she's far too clean and fresh looking - Chelsea was very well loved, and looked the part, while this crocodile finger puppet has definitely not endured years upon years of a child's affection. And, more importantly, she's not Chelsea because we've already established that Chelsea grew up into a bigger crochet crocodile. This has to be Chelsea's younger sister, Cici.

And if I could find another of Chelsea's kind after all these years, then maybe, with a bit of luck, I might find the pattern for her, and be able to make more of them. Fill the world with Chelseas.

8 months ago
Made A New Playlist But So Far It Only Has 2 Songs In It

Made a new playlist but so far it only has 2 songs in it

5 months ago
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lankyhorologist - Sometimes I post things.
Sometimes I post things.

Mostly I don't.

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