As a designer and machinist myself I've got to tip my hat to the old bloke who designed and built that thing, it would be very difficult to make all those tiny parts and extremely difficult to design.. i always wonder with stuff like this, just how many prototypes did they have to make to get it to function correctly.. take good care of that thing harry, it's an engineering marvel and more than likely extremely rare

You may have seen it already, but if you haven't, Adam Savage got a couple of these into an industrial Xray machine. It was pretty cool.

@ScrapScience

2 жыл бұрын

Yeah, I just finished watching that one actually. Pretty awesome to see how tightly all of the internal parts fit together in the thing.

I used one in the 1970s for working out gear ratios, as a planning engineer in a factory. It was just about the time that relatively cheap electronic calculators were becoming available.

Amazing piece of tech, I bet the people who owned one in the 50's were envied by their colleagues, like the first people to have mobile phones back in the day

Cool video! Thanks for the show and tell.

Wow! Neat!

Really interesting, thanks!

Oh! Drooling. Cooool

Great explanation and a fascinating device. If there is ever an atomic blast and an EM Pulse that knock all electronics out you'll still be able to work out your stoichiometry for your chemistry!

@ScrapScience

2 жыл бұрын

Haha that's true!

Can you demonstrate some of the more complicated functions in a future video?!? :)

Curious to know What happens when you substract a bigger number to produce a negative number?

@ScrapScience

2 жыл бұрын

Instead of getting negative numbers, going below zero produces a rollover error that fills the entire output with nines. For example, if you did any subtraction that would normally yield -1, you'd get an output of 99,999,999,999. With a calculation that would give you -2, you'd get 99,999,999,998 instead. For -3, you'd get 99,999,999,997 and so on.

i would just about kill for a peppermill. they're gorgeous on both a mechanical and aesthetic level. but, for the time being, i will be happy to have (and play with) my slide rules.

But can it divide by 0? Edit: it actually can but you will have to spin the thing for an infinite period of time 🙃

@yahhav345

2 жыл бұрын

ahhh.... kinda? I mean, the calc do that with subtraction, and you can subtract 0

@heisenbergstayouttamyterri1508

2 жыл бұрын

Sure... but in your dreams

@JohnLeePettimoreIII

2 жыл бұрын

yes. the caveat is that it becomes a quantum weapon that shreds timespace and hurls you into a hostile dimension where you're turned inside out and have to exist at right angles to reality. 😁

How much they go for?? I wish they were re-made. Happy to buy one. Epic item.

@ScrapScience

2 жыл бұрын

It seems people are selling them online for around $1000-2000 (US) these days. That's from a very quick search though. There are likely better deals somewhere out there.

it's winter where your at? are you at the south pole?

@ScrapScience

2 жыл бұрын

Yep. Well, not the south pole but the southern hemisphere at least...

@Pokeman_official1

Жыл бұрын

@@ScrapScience New Zealand?

@ScrapScience

Жыл бұрын

@@Pokeman_official1 Close, but not quite. Tasmania’s the one.

Off topic question: I was watching a video by NurdRage on producing Fe-oxide by various methods (kzread.info/dash/bejne/ao6FmJmJf6_Poco.html). At 7:01, he shows an electrochemical reaction with Sodium bisulfate as electrolyte where iron is plated instead of iron oxide. Could you explain this?

@ScrapScience

2 жыл бұрын

Sure thing! I'll actually be doing a couple of videos on making iron oxide and electroplating iron metal in the future (though that's probably going to be quite some time away). As for your question, the overall premise of making electrolytic iron oxide is based on three points: - Basic electrolytes immediately precipitate any iron oxidised on the anode, since Fe(III) ions will precipitate with hydroxide ions in solution. This is why carbonate and hydroxide solutions will work for the process (though it appears there are other practical concerns with using these solutions). - Neutral electrolytes will still precipitate the iron from the anode because the cathode reaction constantly generates hydroxide ions to react and precipitate the Fe(III) you generate. This is why a NaCl solution will still work for precipitating the iron. - Acidic electrolytes do not contain any hydroxide ions, and so using these solutions will not generally precipitate Fe(III) or Fe(II). As a result, you just end up making a solution of iron, which can plate onto the cathode. Using sodium bisulfate gives a very acidic electrolyte, hence why this process is observed in that case.

@CF23583

2 жыл бұрын

@@ScrapScience So if I understand it correctly, an acidified (with HCl) solution of FeCl3 should plate pure iron? Or is there some kind of buffer effect from the bisulfate?

@ScrapScience

2 жыл бұрын

Plating iron generally requires the presence of Fe(II) ions, not Fe(III) (otherwise you'd just end up reducing Fe(III) to Fe(II) on the cathode). Additionally, for reasonable efficiency, you'll need to use a source of iron as the anode in this type of plating cell (otherwise you'll start turning the Fe(II) into Fe(III)). But yes, an acidified solution of FeCl2 should allow for plating of iron if you use iron as the anode. You'll get significant hydrogen generation alongside the reaction, so it will be inefficient, but should work in theory.

@CF23583

2 жыл бұрын

@@ScrapScience How can one eliminate (minimize) hydrogen formation? Chelating agent?

Gosh! The Swiss! They are superior !