Intro to LL scales

[@jadenephrite]

Thank you, Bob, for your video. For those who are unaware, the LogLog (LL) scales for the slide rule were invented by Peter Mark Roget in 1815. He was a British medical doctor, a Fellow of the Royal Society and the author of "Roget's Thesaurus" published on April 29, 1852.

[@sliderulesandmathematics9232]

Indeed he did and indeed he was. Very interesting fellow.

[@eugeniomarins2936]

Dear Sir, I am elated to have found your channel. As i am a young bloke, not even 60, i haven't had the pleasure of learning how to use slide rules. But i inherited a handful of them, and me father only taught me the basic operations. Now i have to see some 2 yo videos of yours. Thanks! Cheers from Brazil!

[@sliderulesandmathematics9232]

Welcome aboard!

[@davido3026]

Fountain pen, very classy!!!

[@martinfiedler4317]

Thanks! Looking forward to the next videos on this topic 🙂

[@sliderulesandmathematics9232]

You got it!

[@midnighttutor]

Your manipulation of the slide rule is excellent. As far as communicating the basis for the manipulation to the student, I think it would be very helpful if you included the appropriate basic algebraic equations. I have not watched all your videos maybe you covered this earlier. For example, logs turn multiplication into addition, but if you want to take any number to any power you are left with multiplying exponents...hence the need for the log of a log to convert that second multiplication to addition. A simple equation would really help the user to understand what is going on.

[@sliderulesandmathematics9232]

Great point. Obviously this is well into the series and I’ve discussed the basis several times. But that said, I’ll go over the ll scale math specifically. Thanks for the suggestion

[@CaribouDataScience]

Thanks

[@sliderulesandmathematics9232]

Welcome

[@CaribouDataScience]

What fountain pen are you using?

[@sliderulesandmathematics9232]

It is an Aurora that I’ve have for 25 years

[@N7TWL]

Hi, Bob the Science Guy, I have a question: At some point in time, several of the major slide rule companies came out with so-called "vector" slide rules: Pickett had the N4 Vector, K&E had the 4083-3, and Dietzgen had the n1725. The major difference between these slide rules was the addition of three hyperbolic scales - Th, Sh1, Sh2. I have not done anything yet that I need hyperbolics for, but I am finding out that I am going to need them to understand how current and voltage work in AC circuits, and there are tons and tons of applications elsewhere in physics - I've not done them yet, but I know they are there. Anyway, my question is this: Later models of slide rules from these same companies came out with no hyperbolic scales. They were simply dropped off, never to be seen again. So, how were (or are) hyperbolics or vectors handled on these later slide rules? Perhaps you can do a demo of how to calculate hyperbolics on a non-vector slide rule? Thanks.

[@sliderulesandmathematics9232]

I've not learned the math for them. that is coming.

[@JohnLeePettimoreIII]

i un(globe)earthed most of my slide rules today. actually more "mechanical calculators" than just slide rules. some of the more amusing slide rule models i have are : K&E 4002-3 (engraved with the original owner's name!) AccuMath 500 in nearly mint condition K&E K-12 Prep (681892) with instruction booklet Pickett N902-T "Simplex Trig" K&E 4058 C "Beginners Slide Rule" solid wood, excellent shape, missing one cursor leaf spring K&E 4058 W bamboo, nearly mint Post VersaLog 1460

[@sliderulesandmathematics9232]

They are remarkable

[@judybassett9390]

Thank you for this video. Does your six foot slide rule have LL scales?

[@sliderulesandmathematics9232]

Yes it does! It is a Pickett N-500

[@RensePosthumus]

My Aristo Studio 0968 slide rule came in yesterday. It is wonderfull to be able to replicate your video's.

[@sliderulesandmathematics9232]

That is a great choice. You will notice some of the scales are in different locations so you have to think of how to take advantage of that compared to the n3

[@RensePosthumus]

@@sliderulesandmathematics9232 Your video's rekindled the fire for sliderules. I already have some other slide rules (including the N3 and Aristo hyperbolog)

[@davido3026]

Logarithmic scales!!!

[@naikrovek]

you said "yoo-ler" in the outro. :)