Відео

The Napiers' bones are awesome. Now Genaille. Cool.

IMHO you have repaid the gifter with these videos, and the rest of us benefit too. Curtsmas in July!

Negatives appear as the 10's complement. Some old decimal computers did that too.

So a few years ago I had to learn Real Analysis and found amazing lectures on this channel. By an insane coincidence, my grandpa was gifted a Curta II because his name is Curt, and he asked me to figure out how it works since I'm the one math guy he knows. Incredible that this channel is a one stop shop for these two purposes. Also, it seems like the Curta stores negatives in 10's complement the same way a computer stores them in 2's complement. Amazing that this concept was invented for mechanical calculation before the electronic calculator existed!

...🕶️👍

I have a picture of a NYC worker using a board with 4 quad counters (one on each edge) to count cars at an intersection.

I NEED one of these things dude! I go into antique stores that sell all kinds of random old trinkets (and trash) and dream about coming across one of these for like $100 or something 😂 I wish. I dont know why, but I MUST have one.

Professor, you mentioned that “like most of projects I’ve done, I have a pretty good idea of what the theorems would end up being, even from day 1.” Could you maybe (at your convenience) share more on how the thinking process would look like, and how to judge the risk of a problem? From my guess, the process would be, initially we have a conjecture that we want to prove, and a few ideas of how to do that. Then we tried it out, however, it doesn't work, and maybe the statement is wrong, so we change the statement, and then try to prove it, iterate the process until we have a tackable statement and its proof. I'm not sure whether this would be typical for mathematical research. Personally, I spent a very long time to figure out how to prove a conjecture, and I've tried many things but did not figure out how to prove or disprove, I would be very appreciate to hear from you that whether this type of problem is actually on the spectrum of high risks, and we should more focus on projects that we have an idea of how it would be at day 1, to keep ourselves on the track. Lastly, Thank you very much for sharing this video! It's great to see how mathematician works, and how a collaboration starts. 🌞

Do all the methods and whoever wins the most methods, wins.

Excellent little gadget . Thanks for posting 👍👍

I have a quick question I see a bunch of math courses such as math 1171, 1152, 1150, 1173, 1100, 1170 and so on. Do they all use similar concepts of calculus? And what can calculus be used for?

1:53 There was plenty of coaxial cable in the 1960's. It's how I received my TV back in those days, because we were too far from the stations to get it via antenna. Coax was used as far back as World War 2, and before.

New year's resolution: work "pop the doink" smoothly into a conversation.

The math in the blackboard seems to mostly check out. They are expectation values for angular momentum operators in the total angular momentum basis, and there's also an integral for the spherical harmonics which is also relevant.

The bar is really low to get a "good" rating

A surprise, to be sure, but a welcomed one.

One of these just sold on eBay for five bones! I woulda bid, but I already have one.

Great to see you again! Hope you're doing well.

Still waiting on your 'Apollo 13' slide rule video.

3:08 What's wrong with the bra-ket notation from episode 3? That's the standard way of representing matrix elements of an operator. Not too many bars. I do think it's a cardinal sin to write J like a backwards L, but other than that, I don't see much wrong with it. Maybe they shouldn't have divided by J^2 since you can't divide by operators, but if they're just being lazy about some agreed-upon norm for operators (e.g. determinant or a Frobenius norm), that's fine too

I love that there are 320 views and 19 comments, and that you called summer Glau a forehead actor.

My favourite math props moment is in the second live action Scooby Doo movie. The movie itself is nothing special, but there's a scene where Velma uses a flight computer slide rule and I literally shouted at the screen when I saw it. I don't remember exactly what they were doing with it, but I'm pretty sure that's not the right slide rule to be using.

Forehead actress is going to keep me smiling all day.

I have an R.C.Allen adding machine but never thought of it as a potential movie prop. Neat!

Funny coincidence. I just started rewatching this from the start only a couple of days ago. I do like it - for starters Summer Glau is a wonderful Terminator robot! There's some interesting time-travel logic that shows up later on in the 2nd season, like criss-crossing time branches or something. Too bad they didn't keep going into the third season.

They go back further and build a time machine out of an abacus, a sundial , and some trig tables. click, click, click, whooosh !

Fun! This is the first time UA-cam's recommended your videos to me since the L.A. Noire / The Prisoner videos.

Happy to see you making videos again!

I love it when props are made from repurposed other items. It happens more often with electronic toys than calculators, and usually in low budget films/series. Eg Firefly used a Master Merlin game as a controller

[blank] Bashing is always fun in movie props … I keep thinking that Brazil & 12 Monkeys must have Oodles. 😅 *oodles - lots

Lol! I just saw another video of an old calculator, and I thought: I haven't seen Chris Staecker in a while. And here you are.

From time 2:45 in the video, the computations he is doing are these: 17 + 15 = 32 32 + 23 = 55 55 + 87 = 142 142 + 91 = 233 233 + 45 = 278 278 + 67 = 345

Could you tell me about the information of textbooks? Thank you so much!

Very clear description of the Isoperimetric quotient. Thanks :)

I have finals in a week.this video is just so helpful and lovely. thanks a lot!

Thanks you Sir for this vidéo. Please Can I use texmacs that is much more easy for a New writer .

I think I understand this. It’s a device to sort out numbers. I think I figured out a division on it. It truly is interesting.

You can divide with these.

According to my slide rule the answer is ...267,000

Your series is fun and full of good, sensible reflections. At 1:02:25 for the Curta during an expedition to Greenland, those not-so-smart marketing folks added an image of... a penguin from Antartica! There are no penguins in the Arctic. Doh!

How would you like to have to use the 8 hours a day😮

This was truly excellent and I learned so much. Thanks Professor Chris.

One of these days the youtube algorithm will give this channel the love it deserves. The hundreds of thousands, if not millions of views per video. And when that day finally comes Comptometer prices will hit the moon as thousands of people are influenced to rush out and buy them, and this man will cash out on both ends as he gets that sweet youtube money while liquidating his 8 storage sheds full of mechanical adding machines.

I did that calculation on my Odhner 227. Very satisfying ❤

I have a brown one that has cents, dimes, dollars, ten dollars

Do you know what happened to your webarea? It looks like it's dead.

Thanks for your great videos. Of all the old big adding, listing and calculating machines, I find the Dalton 10 key to be the most obscure. It had an early patent tjat included a typewriter keyboard, maybe for typing on invoices and calculating the total?

Well now I'm buying a Bates numbering machine. I've been looking for this exact thing but apparently my google-fu wasn't strong enough. Thanks Chris Staeker!

You could use it as a clicker by just clicking 10 and ignoring the 1s place.

Me: I would like 50 free paint sticks please. Home Depot employee: Sure, no problem sir. (Frantically presses the Napier's Bones Alarm under the counter.)