#slide rule
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General Electric 1961 Aircraft Data Chart and Airspeed: Altitude Indicator. Slide-Chart by PERRYGRAF. Two sided, and works like a slide rule.
via USAF Aircraft of the 1950s to 1980s Facebook group / shared by USAF Chief Master Sergeant Joe DeAne Nottingham (posted here on scanzen.tumblr.com with permission)
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(via Moral panic article from 1984 about the demise of slide rules | Boing Boing)
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Two hands using slide rule at drafting table, 1966
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I would have been happy!
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My Number Card and Digital & Analog (Essay)
Japanese Liberal Democratic Party members are not familiar with the difference between digital and analog.
Digital should be used for commercial calculations, and analog should be used for scientific calculations. Most of the Liberal Democratic Party members come from commercial backgrounds, and although they can use an abacus, they cannot use a slide rule. The abacus writes money down to the last digit without any errors, but in scientific calculations, there is a concept that 3 or 4 significant digits are sufficient. It is meaningless to line up numbers with dozens of digits.
Computers are digital, but you need analog calculators to design them. After all, computers are the products of science.
It has been a long time since this slide rule was banished from mathematics education in Japan. Instead, computers that only track numerical accuracy are disgustingly recommended. Idiots who can only be in the humanities is degrading the sciences. In fact, with a computer, "you don't have to think," but with a slide rule, "you need a brain." My number card is developed in the context of the above.
I haven't registered for this card yet because I consider it unnecessary.
Rei Morishita
マイナンバーカードとデジタル&アナログ（エッセイ）
日本の自民党員は、デジタルとアナログの違いをよく知らない。
デジタルは商用計算、アナログは理系計算に用いるのが本義であり、本来使い分けられるべきものなのだ。だいたい自民党員には商科出身の者が多く、ソロバンは使えても計算尺は使えない者ばかりだ。ソロバンは、金銭を誤りなく最後の桁まで記すが、理系の計算では「有効数字」という3桁か４桁で足りるという概念がある。数十桁も数字を並べること自体無意味なのだ。
コンピュータはデジタルだが、それを設計するにはアナログの計算機が必要なのだ。なにしろ理科系の産物がコンピュータなのだから。
この計算尺が日本の数学教育から追放されて久しい。代わりに数字の正確さのみ追うコンピュータがいやらしいほど推奨されている。文科系でしかありえないバカが、理系を貶めている。実際、コンピュータを使うと、「考える必要はなくなる」が、計算尺を使うには「頭脳が必要である」。以上の脈絡で展開されているのが、マイナンバーカードだ。
私はこのカードは、不必要だと考えるので、いまだに登録はしていない。
#My Number Card#Digital & Analog#essay#Liberal Democratic Party#abacus#slide rule#Idiots#you need a brain#Rei Morishita#mathematics
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William Oughtred was born on March 5, 1574. An English mathematician and Anglican clergyman. After John Napier invented logarithms and Edmund Gunter created the logarithmic scales (lines, or rules) upon which slide rules are based, Oughtred was the first to use two such scales sliding by one another to perform direct multiplication and division. He is credited with inventing the slide rule in about 1622. He also introduced the “x” symbol for multiplication and the abbreviations “sin” and “cos” for the sine and cosine functions.
#william oughtred#mathematics#inventors#slide rule#logarithmic scales#science#science history#science birthdays#on this day#on this day in science history
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just got a slide rule, i have a feeling this is either the only one i will ever get or i will have a massive collection by the end of the year
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YOU KNOW YOU'RE GETTING OLD WHEN . . .
You remember a slide rule, your first calculator.
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Do you guys think the reason Scar always got tasks that made him a villain and prevented him from teaming up with people was because Grian let him reroll when he failed and then got others to help him complete his hard task?
Like a prove your worth situation or something. Prove you can succeed without the help of others as you were meant to.
#secret life#secret life smp#gtwscar#gtws#goodtimeswithscar#grian#like what Grian let him do was directly against the rules#ig watchers ain’t let that slide#skull emoji
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Roman Numerals & Ramen Noodles
Roman Numerals & Ramen Noodles
Young Sophia arrived for her 7:15 a.m. piano lesson in a usual cheery mood. Her bubbly personality is the perfect way to start my day. As we were working on a particularly fun blues song, in four positions, I explained musical language of chords using Roman numeral rather than alphabet letters. I then asked her if she knew what Roman numerals were. She said “Ramen Noodles?”
Although she thought…
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The slide-rule my great-uncle gave me. He was an engineer also. Even has a carrying case for calculations in the field. No I do not remember how to use it. These were before my time so I never used one in practice.
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A bin of slide rules
A bin of slide rules
One of the finds from the 2022 Atlanta Hamfest that I’m most excited about is the bin of slide rules and slide rule books that Connie found at one of the flea market tables.
A bin of slide rules and slide rule books
There were 10 different slide rules and a total of 12 slide rules in the bin. Some of them were pretty basic slide rules, and some were more advanced with multiple scales, some of…
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#they hate to see a girlboss winning#gaslight gatekeep girlboss#okay this is epic#coelacanth#damn who is she like is she single can i slide into her dms like whats up girl??#196#r/196#rule#apartmentofawesome
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[Bats eyes at you] What if Azula DID do something after her father burned half her brothers’ face off
"What did you do?"
"I am my mother's daughter, Zuzu."
And also her father's. How nice of him, to leave her his crown as his dying act.
#Azula sliding a newly altered will towards the Fire Sages#Don't set precedents you don't want to uphold#or shall we examine my grandfather's will a bit more closely?#and your finances under my father's rule#The Fire Sages: ...Everything seems to be in order Fire Lord Azula#avatar the last airbender#atla#regicide and patricide are two words for multitasking#ficlet
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We all talk about how inquisition toned down the previous games ability to be chantry critical and all that, but can I bring up how inquisition minimized how dangerous the darkspawn are?
Those planks of wood or a single boulder over the hole aren't gonna do shit to keep em down. These things dig like a colony of ants. Two games ago we were told a gate made of multiple sealed steel doors would only keep em back for a decade at best.
But then again this game has absolutely zero stakes so why not.
#dragon age#I still laugh at vivienne going “abominations are inevitable” if you recruit the mages and then nothing happens ever#no companions turning on you if you cross a line‚ the only npcs that can perma-die get written out of the story even if you save them#and the only consequences of your choices are companion approval and epilogue slides#any exception you can think of is still the exception rather than the rule#oh yeah I was talking about darkspawn
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Revival the slide rule in education！: Mathematics Note -7 (essay)
"Revival of slide rule in education" Cram school instructor Rei Morishita 40
When I was a junior high school student, there was a "slide rule" in the curriculum of the class, and I remember buying a textbook and studying it myself because of the fun of its principle. Just as abacuses were required for commercial students, slide rules were required for science and engineering students. I'm not good at addition, but I could say that the slide rule is a magic stick that demonstrates outstanding power in multiplication, division, exponential calculation, and trigonometric function calculation. It can be said that it is a representative of analog type computers.
Of course, in terms of comprehensive functions, it is not as good as a digital computer, but even so, I think it is too much not to tell students about the existence of this calculator. As an application of the theory of logarithms in mathematics, the slide rule is worthy enough just as a teaching aid to teach students "visually" about logarithms. Computers are not just computers.
Leading the students' interest in only one direction is also negative in terms of diversity.
"The above is a letter to a newspaper company."
A slide rule is a tool that "visually" scales the mathematical concept of logarithm. The slide rule is divided into outer scale, inner scale, and cursor parts. In mathematics, there is a formula LogA+LogB=Log(A*B), but the scale of A (outer scale) is assigned with a logarithmic length scale on the scale, and the scale is moved to B (inner scale). Align "1" on the scale and read the scale of B with the cursor, it will be the "sum" of the logarithms of A and B, and as a result, the number A*B will be displayed. The prominence of the logarithm is deeply felt in the way that the sum of the lengths indicates the product. The same holds true for other calculations, such as the quotient for length differences.
This tool is a collection of mathematical, scientific and engineering wisdom that has been steadily continued since ancient times. It seems that the stupid officials of the Ministry of Education, Culture, Sports, Science and Technology are excluding it from school programs, as if "it is unnecessary because there is a computer". As I have said, slide rules are foolishly thought to be worth continuing to teach as analog calculators. I think it's a dangerous trend to eliminate all analog things while all phenomena are being streamed digitally.
#slide rule#education#magic stick#logarithms#analog#digital#it's a dangerous trend to eliminate all analog things#mathematics#essay#rei morishita
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