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A question about the vector slide rules - it seems that most of the major manufacturers produced a vector slide rule with hyperbolic scales, but later model releases dropped the hyperbolic scales. Since these types of calculations are necessary in a great many applications, how are these calculations being done and what scales might they be using on these later slide rule models? Thank you!

It's really hard to beat the SIC 1610D circular rule. The Pickett 110-ES is essentially the same thing, but I love the elegance of the white SIC. I have the FC 8/10 as well, but it's not nearly as powerful as the aforementioned ones.

its time for the

The a,c,b and LL scales look more ‘sensible’. I wouldn’t mind finding one!

Addit: I got hold of a 1010 SL-T. That one has two square root scales (as on the K&E deci-lon), A, B, ST, T, S, C, D, DI and K on one side; L, DF/CF, CIF, C, D, DI and Ln scale on the other. Quite why they put the Ln scale on, I'm not sure, but it does perhaps compensate a little for the lack of log-log scales and it does allow direct reading of natural logs and powers of e within a limited range against both the D and DI scales. If I were redesigning this rule today, I'd change the K scale to the other side (there's still room for it if you push the L scale down a little) and replace it on the trig side with a P scale.

You many times use "exotic" slide rules. Why not just use a Post Versalog? It's VERY difficult to follow you!

Neat video, but I'll admit I spent more time marveling out how you're able to write while holding a pencil that way than watching the computation. ;^)

I am holding in my hand a Pickett Model No. 4 in a sort of pale beige colour, which is like the one you are demonstrating except that it doesn't have the Ln scale. I haven't touched it in years and I'm very grateful to you for this quick tour of it. I started out as a Pickett man - the first slide rule I bought was one of the late plastic ones - but I came around to K&E and Hemmi as time went on. I agree with you that Pickett tried to squeeze on a few too many features! Alas, my 20 inch K&E deci-trig duplex came with a rotten cursor (a known, increasingly common problem!) and broken glass. I'm going to have to see if I can buy a new cursor for it somewhere.

Completely agree. I have one that I bought at a garage sale for next to nothing. But it's scale layout is hopeless. A shame because the mechanical quality is high. I have a modest collection of slide rules including the famed Faber-Castell 2/83N, but the ones I invariably grab when I actually have something to calculate on a slide rule are the Post Versalog or the Hemmi 259D. There's something about those Japanese bamboo rules - the clarity of the scales and numbering and the smoothness of the slider movement. Being a physician, I alctually use a log-log slide rule professionally. Some of my patients insist on taking a tablet every 4th or 8th hour even though the half life in the body of the drug in question is 48-72 hours. It's my experience that the slide rule in my hand strengthens my credability for these patient when I do a quick calculation of how much is actually still in left the body after those 4 or 8 hours. Aside for that, it's also useful for a quick and dirty calculation of compound interests. For amortizations and monthly payments on your house loan? Forget it, there's much faster apps for your smartphone (or - if it has to be retro - the HP 12C pocket calculator).

The German "Rocket Scientist" (Von Brawn) that developed the huge Saturn 5 moon rocket used nothing but 2 sliderules he had brought to the USA with him. One he had owned since his student days, the second sliderule he bought before the war, in the 1930's. On these he made all the engineering calculations needed to design, test, and fly the Saturn 5. So, thought calculators were "nice to have" they weren't actually necessary for the entire Apollo Program !

Where does the Pickett n-500-t fit in?

I hate to admit my age but I had a SR 40 back in 1977 for high school. It worked okay but was less than a full statistical and binary/hexadecimal/octal, conversions of miles, temperature, gallon, inches, lb much more in my next science Texas Instruments calculator in the late TI-36X solar calculator pickup at like Kmart. In 1987 I went to a local Radio Shack and bought their, my ultimate favorite, pocket computer cakculator made by Sharp Tandy PC-6! Having those two calculators still today is a fun blast of my past to do highly advanced University math to complete an Engineering degree!! Having lost my SR 40 (but still have the wall ac charging transformer plug accesory in my box of storage of adapters from electrical wall socket to charger battery of all my past electronics. My TI-36 Solar has a keading 3rd digit gone out with the central liquid quartz digit portion. The number "8" looks like a narrow "11" showing that problem. I have to divide the calculation by 10 to make sure of the digit ... It still is great, otherwise which still solar powers at low light luminosity and calculations. Too bad the liquid quartz display has gone out a little but not to bad to figure out what the leafing 3rd digit is of an unlighted top, middle and bottom central quartz light up (only with that digit)!

My Hemmi 260 has two marks on the glass that appear to be used for the A/B scales only (in addition to the main hairline in the middle). What are they for? I looked in the manual and I didn't see mention of them but maybe I missed it? If you look at the image at the sliderulemuseum you can see the marks but you have to look hard at where the A/B scales are. One mark is far to the left of hairline and one is slightly to the right of hairline

So, ...I finally got a Hemmi-260 and the first thing that I that caught me by surprise was that the C scale has no numbers engraved on the tick marks between 1and 1.5. The way I discovered that was that I kept getting a wrong answer on a chain mult problem but my trusty Deci-Lon gave the right answer to the same problem.. That's when I realized that I had been mis-reading the Hemmi-260 scale due to it having no numbers Lol! I like the self documenting legends on the Hemmi but That Deci-Lon is my favorite still.

My dad was in the navy ww2later on when I was 15 in the early 70s he gave me a versatrig rule. After he died I found a 153 slide rule in a leather scabbard marked LOAD ADJUSTER…DO NO REMONE FROM..in gold letters…thanks for the introduction to this jewel.

Now do soroban

I'm struck by the fact that the first calculator *I* had, the Omron 86SR, had basically this identical function set with the identical precision... *except* for the parentheses for algebraic entry. Didn't have those. I suspect they were trying their best to replicate the TI-30's set. I still find it a little weird when calculators don't use postfix for single-argument function buttons, because I'm so used to the way early scientific calculators worked. (And then switched to HP RPN calculators, where everything is postfix.)

I think the arrangement you proposed is in one of my preferred slide rules:- the ARISTO 0970.

Have the 4041 and 4058W great vid Not sure how to use the back yet, though The person said their dad bought the 4041 new in the 40's But, looking at what I found it looks to be olderDid they make the 4041 after the N came out in 1925?

Thank you for this playlist! Im trying to find an implementation for the ln in my programing language which has quite the severe constraints, this helped me get new insight. Thanks!!

Uh. Interesting mental exercise. I even know paper slide rule, actually two cards where one card has 10 slots and and scale from 1 to 10 wraps ten times. Putting cards somehow on top of each other can be used as unwrapped cylindrical slide rule where scale is a spiral. Actually I'm not sure if these cards had horizontal scales or they had some slopes. I guess I may try to buy transparent foil or paper into printer and make it.

Around 1976, my father bought an Omron 86SR (I think the SR was for "slide rule"), which had basically the same scientific-calculator features as the HP35 but was less capable in that it only showed 5 significant figures when it was showing the exponent (or 8 without). It did have a radians mode. But it was also quite affordable. He liked it so much that he got me one too. I didn't understand all those transcendental functions at the time but I would eventually. It had an appealing chunky design with big round buttons, actually no more buttons than a simple four-function calculator but it had a shift button that accessed all the advanced stuff. The display was a blue-green VFD, pretty power-hungry. It lasted me until the mid-1980s, when it stopped working after taking a fall.

The calculator has it for ease of use and reduced likelihood of misreading.

When I was working in a survey and engineering department for a municipality I had to spend a lot of time explaining to my people that in many field measurements getting more than two decimal places was unrealistic in construction layout situations even though a calculator or data collector would give a result to three or more decimal places which the operator would want to right down in the field book.

What would have been the original retail price of that Hemmi Sun 42A

Regarding 13:35, Astronaut Buzz Aldrin used a Pickett Model N600-ES Five Inch Pocket Size Slide Rule for the Apollo 11 Moon Landing on July 20, 1969. His famous slide rule was later auctioned for $77,675 on September 20, 2007. Its original price was $10.95 in 1969.

I had a TI-30 once upon a time. What a game changer it was.

At that distance leave the camera focus fixed

Is there a way to use the fixed scales for S and T on a Hope 530 slide rule in the same manner as in this example?

I bought a HP35 in 1972 while going to college at night. Price was $395.00 which was almost a werks pay.

I love the LED display. It’s rather comical how long some calculations take. I took my TI Business Analyst to buy my car. The car salesmen almost lost it.

Another instant Herning classic!

In mid 80-s I was only one in my univercity using slide rule and.. I was faster in my calculations than many of my classmates.

If you want to remember the SR-40 calculator, if you want to experience nostalgia, you can download the SR-40 calculator emulator from this address. ua-cam.com/video/08BBZH7Bz98/v-deo.html

I have a TI-2500 Datamath from 1971/1972. It can only add, subtract, multiply, and divide. There's a switch that says CHAIN/CONST, but even after looking it up I don't understand what it does. I love the design of it. A bit chonk, but looks really cool. Like an aperture science design.

My parents used the slide rule, even though they had calculators, they were more experienced with the slide rule. Calculators do not teach, they make people lazy.

I just got my first slide rule, a Pickett 901ES, from a hamfest. No trig, like you said. I made a circular slide rule but this is my first commercially made slipstick.

No slide rule or calculator needed. My chem professor had log and trig tables in his head and did all the calculations without paper and pencil. There were 300 of us, the next class day he knew everyone by name. Enrico Fermi calculated in his head for the first nuclear energy released in real time on the Manhattan Project beating the computer.

Were trig calculations on the TI-30 postfix? So you had to do PI SIN and not SIN(PI)? My somewhat recent TI-30 something or other automatically creates parens for SIN.

RPN is the best system. Have used both. Once you wrap your head around RPN it is much easier than the other one. I had use of an HP67 before they were on the market. Wonderful way to learn how to program with limited steps. One thing that must be mentioned. I never had my slide rule malfunction, but did have the calculator blink out on occasion.

YES!!!

I have acquired a slide rule with a much worse scale set. I believe it to be a Relay 512 5". The scales are: Front: DF/CF, CI, C/D, A Back: S, L, T The tan scale is tied to the C and D scales. So far so good. However, the sin scale is a two decade scale, running from about 34' to 90°. The A scale thus gives 1/sin. Call me dim, but how on Earth are you meant to do trig calculations with this without multiple slide/cursor movements? I would really appreciate any workarounds you could offer.

Anyone remember the big brown and yellow calculator shaped like an 🦉from the early 70's? That's what I used when I got off the short bus 😄

Nice video! Thanks! EVERYONE would have picked a calculator in the 70s, as they were HiTech and COOL! I still have my Panasonic with Nixies, which still works! You needed glasses to read those microscopic HP displays! But they had the trans functions😢

I still have my TI - 30. It still works. Sometimes it's better than more modern ones.

My liberal arts college degree from the 70's had a stumbling block... a single statistics course called Psychometrics. The woods were full of students who lacked that once course to graduate, and the majority of those enrolled in the course were taking it for the 2nd, 3rd or later time! Calculators had just started to be allowed since they no longer were a rich pupil's advantage, so I bought a TI-55 key programmable calculator. I just pre-programmed all the equations and plugged in the variables from the tests. Made an A without having a clue of what I was doing. My greatest fear was the 45-minute life of the battery, so I arrived early to get a seat near an AC outlet. The university finally dropped that course requirement, but I think if it had known key programmable calculators existed, it would have banned them!

I hope you can get your hands on and showcase a Pickett N515-t electronic engineering slide rule. It's an amazing special purpose slide rule. In addition to the basic scientific stuff, it can calculate resonant frequencies and reactances and the back is loaded with electronic formulae. The downside is the ln scale, which is pretty much useless and distracts from the log10 scale.

I happened to dig my N 1010-ES (yellow, 10" x 1.25", double-sided) out of storage recently, then came across your videos! Brought back good memories. I think my first slide rule was a plastic circular, then a plastic 6" straight, then finally graduated to the 'big leagues' with a metal slide rule. 😃

Step dad had a calculator like that but it took 4 D batteries. Can't remember the name brand it was too long ago but it looked just like this but his weighed like as much as 2 bricks.