YouTube Classics, Part Deux

[nsaspook]

 

[DennisN]

Really annoying sound , but still very cool!

Demonstration of the third version of Rhythmicom built by Leon Theremin at Moscow State Conservatory in early 1960-s. The first Rhythmicon was developed by Leon Theremin for Henry Cowell in 1932. It was the first rhythm machine ever built.



EDIT: A more hightech rhythm machine: EKO COMPUTERHYTHM

 

[nsaspook]

Mk 1A fire control computer. How to solve 20-plus variable calculus problems in real-time.
7 videos in the YouTube series.

 

[jim hardy]

now THAT is GREAT ! Thanks @nsaspook! (@still not working i have to type in the whole name)

 

[nsaspook]

now THAT is GREAT ! Thanks @nsaspook! (@still not working i have to type in the whole name)

I worked (installed modern data processing systems not related to fire-control) on all the BB-62 class ships in the 80's when they were pulled out of mothballs again for active service. Most of the old 'analog' computers were still operational (with upgrades to automatically input signals from modern computers) to find firing solutions for the big 16 inch guns. Synchro data transmission links were used to slave data to the analog machines. http://www.eugeneleeslover.com/ENGINEERING/OP2074.html

https://en.wikipedia.org/wiki/Rangekeeper
Coding in metal.

 

[jim hardy]

I hope they're in a museum somewhere !

An old friend served on the Missouri in WW2 working on those mechanical computers.

As recently as 70's we had mechanical analog boiler controls that used compressed air , bellows, cams and levers .
Pneumatics works fine, is impervious to EMI, just needs clean dry air. The steady 'hiss' when all is going well is comforting.

 

[jim hardy]

Coding in metal.

For some things it's better than Fortran.

 

[fresh_42]

Coding in metal.

What was your favorite programming language?

Assembler

https://cimg0.ibsrv.net/cimg/www.do...100-1/264/solid-rivets-on-a-girder-139264.jpgCobol:

http://img.fotocommunity.com/man-mu...5c-ca20-4011-85fd-3e5b77d2bbc5.jpg?width=1000RPG

http://majgas.si/files/images/schweissen.jpg

 

[nsaspook]

Bare-metal programming.

 

[Aufbauwerk 2045]

Long live science. Long live reactors.

 

[Borek]

Well, vimeo, not yt, still worth watching. Some of you may remember my pictures from the area, posted several years ago.

 

[nsaspook]

Truck surfing.

 

[DennisN]

This video is beyond weird...

 

[fresh_42]

This video is beyond weird...

What did we learn here? Always keep topologists busy, for otherwise they might produce youtube videos!

 

[OCR]

What did we learn here?

Chuck Norris effects causality... .

.

 

[Borg]

Kokichi Sugihara's 'impossible' objects

Spoiler: How it works

 

[nsaspook]

 

[nsaspook]

They should arrest him, those dance moves should be banned forever.

 

[jim hardy]

I'd wager the girls were not favorably impressed.

 

[OmCheeto]

They should arrest him, those dance moves should be banned forever.

I'm guessing I'm overqualified to be an FBI agent.

Denver Post; "An off-duty FBI agent allegedly accidentally shot a man in the leg early Saturday after the agent’s gun fell from his holster..."

His holster looks suspiciously like the crack of his butt.

ps. Do they not teach FBI agents about the "safety switch" on a gun? Seriously. It's been 40 years since I last took a class on handguns, and even I remember that.

 

[jim hardy]

ps. Do they not teach FBI agents about the "safety switch" on a gun? Seriously. It's been 40 years since I last took a class on handguns, and even I remember that.

some Glocks don't have one. They assume the user means it when he pulls the trigger.

https://us.glock.com/technology/safe-action

Play the video back at 1/4 speed and clearly it goes off when he grabs it, and his finger looks to be on the trigger..

I prefer 1911's myself.



old jim

 

[Bystander]

I prefer 1911's myself.

Ditto.

 

[OmCheeto]

some Glocks don't have one. ...

That just sounds insane to me.

Play it back at 1/4 speed and clearly it goes off when he grabs it, and his finger looks to be on the trigger..

Don't need to. Can't imagine a gun going off otherwise.

I prefer 1911's myself.

That was the gun I was trained on.

old jim

Nice production.

btw, did you see the video from Hawaii the other day?

Guns.
Some people should not be allowed to own them...



From the context of the video, the shooter did not know who his neighbors were.

 

[fresh_42]

Look up Idiots with guns on youtube. Hilarious, but one has to be prepared to hear a couple of ugly words. I like the one who actually looked down the barrel of his rifle. Beside the obvious stupidity, how did he expect to view something without light?

 

[DennisN]

They should arrest him, those dance moves should be banned forever.

It wasn't that bad, they all seemed to have had a blast.

 

[jim hardy]

video from Hawaii the other day?

Was that the video ?

Sure looks like an over-reaction. With all those witnesses the big guy could easily wind up in the 'NICS Denied' database.

 

[OmCheeto]

...'NICS Denied' database. ...

?

google google google

The National Instant Criminal Background Check System (NICS)​

Ok.

ps. Sorry. I'm pretty much "gun" illiterate. They are the least of my interests.

 

[jim hardy]

ps. Sorry. I'm pretty much "gun" illiterate. They are the least of my interests.

The folks who have to approve any gun purchase from a dealer. It's done in a few minutes by phone call. Shoulda stopped the Parkland kid but that's another whole story and covered elsewhere.

Sorry for the undefined acronym..

 

[nsaspook]

 

[Psinter]

Look at this guy's clothes. (I posted a link instead of embedding the video so that the timing works properly since it doesn't work with embedded videos)

If you are not on limited bandwidth, play it at the highest resolution you can and at full screen.

Time 2:23. Take a look at the guy's coat. That fibre weave at the top of the back is Gabardine . The one in the cuffs is a smaller weave, but also Gabardine. The cuffs look even better because the weave is smaller. I love Gabardine. It's just awesome.

 

[nsaspook]

The aerodynamics of flying portable toilets.

 

[DennisN]

A very handy little kit...

 

[fresh_42]

A very handy little kit...

... and we call this "pocket knife" over here!

 

[Psinter]

I was looking for that song for a long time and I didn't know the name. Time (0:23)

Now I know it is Bethoven Symphony No 9. The music that plays when you are doing a difficult math exam, yet you know you are acing it and you are confident in your work.

 

[DennisN]

Neil deGrasse Tyson on Star Wars and Star Trek, very funny!

 

[nsaspook]

 

[DennisN]

Kids react to old computer, very funny!

 

[fresh_42]

Kids react to old computer, very funny!

And if you hand them your old car key the time they get their driver license, they will push it like mad and wonder why the car doesn't open.

 

[nsaspook]

Tesla flying car option.

 

[jim hardy]

Tesla flying car option.

Needs pitch control, doesn't it ?

I assume a crash landing is what prompted the pretty girl with pony tail to run that direction ?

 

[nsaspook]

Needs pitch control, doesn't it ?

I assume a crash landing is what prompted the pretty girl with pony tail to run that direction ?

It just needs to be faster so the time between when the front tires start to drop (alter path) from gravity thus imparting angular momentum while the rear tires are still on the ground is minimized.


Just some good old boys, never meaning no harm...

https://www.barrietoday.com/local-n...cks-crashes-into-parking-lot-8-photos-1029716

 

[fresh_42]

It just needs to be faster so the time between when the front tires start to drop (alter path) from gravity thus imparting angular momentum while the rear tires are still on the ground is minimized.


Just some good old boys, never meaning no harm...

I don't think that is the clue. It looks as if the center of gravity is mostly given by the weight of the motor, in which case a faster car and thus wider jump will result in an even steeper angle.

 

[Borg]

Just before it showed up on the right, there was a bright flash. Maybe it was Doc Brown coming back from the future.
Marty warned him that the reentry was a little rough.

 

[nsaspook]

I don't think that is the clue. It looks as if the center of gravity is mostly given by the weight of the motor, in which case a faster car and thus wider jump will result in an even steeper angle.

Maybe but from what I've been told the center of gravity on a Tesla is centralized pretty low from the bulky battery being centered low under the car. It's really hard to roll over.

 

[DennisN]

Just before it showed up on the right, there was a bright flash. Maybe it was Doc Brown coming back from the future.
Marty warned him that the reentry was a little rough.

Exactly what I was thinking too!
"Where we are going we don't need any roads."

 

[jim hardy]

Hmmm.

Looks like they could use a more robust rear wheel attachment.

It just needs to be faster so the time between when the front tires start to drop (alter path) from gravity thus imparting angular momentum while the rear tires are still on the ground is minimized.

Imagining a free body diagram

If the front wheels are clear of the ground
and the rear springs are still compressed transmitting downward force to the ground
then the moment between rear wheels and CG apply torque to pitch the vehicle nose down.

so i think @nsaspook has a point.

Moral:
If you're going to do jumps, get some rear shock absorbers that are really slow in the extend direction.
Maybe from a vehicle with spring rate 3X heavier than yours.

 

[nsaspook]

Hmmm.

Looks like they could use a more robust rear wheel attachment.
View attachment 230093

Moral:
If you're going to do jumps, get some rear shock absorbers that are really slow in the extend direction.
Maybe from a vehicle with spring rate 3X heavier than yours.

Or wait for the SpaceX option: https://www.digitaltrends.com/cars/tesla-roadster-rockets/
https://www.wired.com/story/heres-how-fast-that-jumping-tesla-was-traveling/

https://goo.gl/maps/wZjh8mp38SL2

 

[jim hardy]

Okay i see. That's what the Tesla driver saw a he approached the railroad tracks.

Here's where i think the security camera was ?

If he was stopped at that traffic light that's remarkable acceleration. I guess Teslas are known for that...
but 0 to 99mph in 260 feet ?

old jim

 

[Tom.G]

The numbers at least look close. (I found 'em, you can calc them)

"...a revamped version of its original Roadster, with crazy fast acceleration of 0 to 60 mph in just 1.9 seconds, 0 to 100 mph times of only 4.2 seconds..."
From:
https://techcrunch.com/2017/11/17/watch-teslas-new-roadster-show-off-its-record-breaking-speed/

 

[jim hardy]

you calc 'em

v = at (eq1)
and
s = at²/2 (eq 2)

if s =260 ft from traffic light to railroad track (i got that from google map)
and the Tesla is capable of acceleraton a = 100mph / 4.2sec = (146.67 ft/sec) / (4.2 sec ) = 34.92 ft/sec²
then to go 260 feet would take how long?
Rearranging (eq 2),
t = √(2s/a) = √(520 / 34.92) = √14.89 = 3.859 seconds
at which time eq (1) says its speed v=at would be 34.92 X 3.859 = 134.75 ft/sec = ~91.9 mph

Not quite ten percent short of Wired magazine's 99.8mph estimate from the video.

So it's plausible he started at that traffic light.
I sure hope he wasn't running through them at 90+ mph. You wouldn't hear an electric coming - "It purrs like a kitten with no lake pipe roar"...

old jim