Basic slide rule theory and use (Part 5): Chaining and S/T/L scales
Вставка
- Опубліковано 16 жов 2024
- The fifth (and final) of a series of videos explaining the basic slide rule.
This video explains how to chain operations and how to use scales S, T, and L.
Basic slide rule playlist: • Basic slide rule theor...
All my slide rule videos: • All Slide Rule Videos
Best slide rule tutor ever. Thanks Professor Herning!
Great series on these wonderful instruments.
I enjoy your videos on slide rules. I have a Teledyne Post 44CA-600 (early 70s). I have a few K & E slide rules, but most of mine are Post slide rules. Keep up the great work on your slide rule videos.
Thanks Steve! After making all of these, I've thought of many ways they could be improved. This summer I may have some time to do updates.
When doing sine near 90 degrees or cosine close near 0 degrees, for example sin(82°) and cos(12°), for precision I usually use S scale with P scale since sin(x)^2+cos(x)^2=1.
I find interest in slide rules in high school and later got a Faber-Castell 2/83N from a online shop with my friend (also interested in slide rule) for about 900 NTD (~30 USD). The manual is pretty much broken, but the case and the slide rule are still in good condictions. I learned how to use the A, B, C, D, CI, DI, K, S, ST, T and P scales from the library and online, after that I was able to do some calculations. This is fun to me, and it even saves me once when my calculator stop working during a test (yes, I did bring the slide rule when taking the test). Still learning about W scales, LL scales and some useful tricks.
Definitely the right use of the P scale! Where I am here in the US the P scale was very rare on slide rules. The W scales are quite interesting and not that hard to use -- if you haven't found it already, Faber-Castell's manual has a pretty good explanation of the markings on the rule that help you remember how to do basic multiplication/division with them.
I'm glad I looked at this video series of yours. By a lucky chance, I have an Aristo slide rule that is DMS but otherwise identical to your little Hoffman. It is marked with the Mobil logo on the back, so I suspect it was the slide rule era equivalent of the office calculator, ordered in bulk and put out for Mobil employees.
I think that was a common thing on smaller slide rules like this. This slide rule is marked on the back with a hydraulic pump company name.
0:57
Actually you could already read the answer on D under 2.8 on C. Correct?
Same for 2:09. The answer is already on D under 2.3 on CI.
Thanks for great tutorials!
I think it would have been a good idea to quote the model number at the beginning of the rule you are using .
It would be nice if you could post where to download manuals . I have tried ISRM ,Eric’s slide rules and Sphere Research but they are limited. Do you know a more comprehensive site as I have REALLY REALLY tried and failed?
I always end up Google searching. Like you, I haven't found a single source that's comprehensive.
In the first example was there a reason that you didn't just put the cursor over 2.8 on the C scale and read off the final result - 5570 - on the D scale? Heading off to the CI scale at that point seemed to over complicate the calculation and reduce accuracy.
I made these videos when I was learning myself, and have been meaning to update them. I intended here to explain how to "chain" operations with the result on the D scale, not to get into the ways to do combined operations w/ C/D/CI.
Thanks for the reply prof. These videos are in a different league than anything else on youtube and have greatly improved my ability with the slide rule. Many thanks for your efforts and enthusiasm! Now I just need to improve my understanding of maths and trig to really be able to implement my slide rule abilities!
Interesting. I never used one of these standard rules in school. I did however when I was 10, learned to use the circular slide rule that my Uncle got a patent for.
He received a patent in 1968 for his ABC circular slide rule which included decimal points. This "unfair" advantage led many school teachers banning its use in the classroom. BTW, I have a few of these slide rules in mint condition for sale
+Erik Wern -- I've never heard of the "ABC circular slide rule," although I have a KL-1 for demonstrations in class. Do you mean that the slide rule has some sort of mechanism for tracking the decimal point in the result? Share a link to a picture or description if there is one!
7:00 My Graphoplex 620d Rietz scale has DMS (Minutes in this case) plus sometimes decimal in the trig scales, very peculiar IMO
Interesting! What do you mean by decimal in the trig scales then? I thought the 620d was totally DMS on the trig scales. I don't have one though. There is a Russian plastic slide rule I've seen with DMS on S and T but decimal trig on ST.
@@ProfessorHerning You got me there crawling through the collection, I got confused and it wasn't the Graphoplex 620d, that's, as you say, completely DMS! I was wrong, but somewhere I got one, still searching, maybe amongst the "nameless".
I meant the division in tens, not in degree minute second, just wanted to make it short with "decimal", I meant " decimal degree division"
Maybe it's the same one I'm thinking about: www.sliderulemuseum.com/Soviet/S392_Soviet_LSLO_25-14P_1979.jpg
Love your videos. Got a little collection to, the American ones are not cheap to get in Germany ;)
Thanks! The German rules are tricky to find over here for a good price also.
I have a slide rule that can compute cosines without taking the compliment: The ARISTO scholar No. 0903.
Yes, many slide rules have complementary angles marked (often in red) on the S scale for computing cosine. This is also done on the T scale for cotangent.