Slide Rule CF/DF and CI scales
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- Опубликовано: 30 сен 2024
- In this lesson we introduce the folded and inverted scales. There are many paths to the same truth, an index is an index, and use the scale that involves the least movement of the slide and cursor. I will mark you down if you get the wrong answer but not for using the 'wrong' scale.
Here is the link to the virtual Pickett N-3 Slide Rule
www.antiquark....
use on a computer as it doesn't work on a phone.
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Note, this is a revision of an earlier video incorporating the virtual slide rule. I just thought it had better clarity and was more concise.
You are great! Here you answer the question that your last vid raised for me: How using the folded scale work.
So when I go to CF, I simply put its index on 4 * Pi.
Going to 6 on CF I get 4 * Pi / 6.
And when I look back to D, I divide by Pi to get the result of 4 * 6.
Ingeniously simple actually...
it really is, and a great tool to teach folks how to visualize numbers and relationships between them. That is why I have a 7 foot long N-500. For teaching logs and trig.
my head hurts :):). But I think I understand :)Thanks
when i was first learning how to use a slide rule, the inverted scales were the most difficult for me to fully grasp. i could wrap my head around the concept just fine. but the practical use of the scales in calculations gave me fits. even now, when i need to use the inverted scales i have to briefly shut my eyes, take a breath and think to myself, *_"You got this, buddy."_*
When I look at an equation the first thing I do is say to myself, 'math problem, who's your daddy'. Then I take it down as easily as taking down a flerf that can't see the curve.
Which scale you use is like a golfer seeing the line on a putt. It takes experience but it just jumps out at you after awhile.
hello, there is something that I don't grasp.
lets call C and D adjacent (because they touch each other) same for CF and DF
and D and CF opposite, same for C and DF.
if I set the index of C over 2 on D ( adajcent) I can read the result of any calculation on the adjacent scale so I can pick any number on C get the result on D or pick a number on CF and read the result on DF.
but if I take the index from the opposite scale meaning align 2 from D with 1 from CF i will read the result on the opposite scale but only for numbers from CF, numbers from C won't work with DF,
Why is that? Why is it not symetric?
Good question let me have a look
Ok now that I’m not driving and can see exactly what your question is… when you align the index of c you are keying it to the index of cf. If you go from d to cf you are keying to pi on d. As a result you get 6.28 on d
@@sliderulesandmathematics9232 sorry for my poor english but that's not it.
if I want to multiply by 2
I can align 1 on C with 2 on D then when I read 2 on C I can read 4 on D or I can read 8 on CF and read 16 on DF.
or I can align 1 on CF with 2 on DF then if I read 4 on CF it gives me 8 on DF and if I read 3 on C I can read 6 on D.
if the index is adjacent I can use both scales.
now if I align 1 on CF with 2 on D if I read 2 on CF i can read 4 on D but if i read 4 on C i read under 7,9 on DF; if I read 2 on C I get 3,96 on DF
@@erwanthomas with 1 on c and 2 on d I don't read 8 or 16 on cf/df. With 1 on cf and 2 on df it is correct to read 4/8 on cf/df. I am not getting the values you state when going across scales. I think you may be confusing the scales and misreading them.
@@sliderulesandmathematics9232 I've check on a decilon and an hemmi 260.
If I put 1 on c and 2 on D, c goes from 1 to five (2x5=10) above 1 on c you have PI on CF and 2PI on df and CF goes up to 10xPI/2 and give you 10xPI the decilon goes up to 16 on CF because DF goes up to 3*2.
so 8 on CF is above 5,1 on D and gives 1,6 on DF . which is expected because that's what folded scales are for. extend c and D witout having to move the slide too much.
it's when you put 1 from CF with 2 on D that only numbers from CF give you the right answer on D but not from C to DF. that's where lies the mystery.