I have just found this: “The New SI Metric and Imperial Tables” booklet (no pub. date but I reckon early 1970s based on the decimal currency stuff) and it’s awesome! (Thread) Image
The morse alphabet! Because you really never know when you might need that. Image
Rules of divisibility! (Is it just me, or does that sound like a magic system?) Image
Long division table. Because you might not always have a calculator to hand, you know. Image
A whole double-page spread on old money. Yes, rest-of-the-world, it really was that brain-meltingly complicated. Image
The avoirdupois system. No. I didn’t know it was called that, either, but I rather like it. Image
Decimals as fractions. I mean, that’s just USEFUL. (See calculator comment above.) Image
Densities and “How to mix ink and paint for various tints”. How could you not love that? Image
Anyway, kids, before Google this is what people had to use! 😄

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More from @chronicleflask

Mar 4, 2023
For #WorldEngineeringDay and with #InternationalWomensDay coming up, here’s a thread of five female engineers #WomenInSTEM 🧵 🪡

(By the way, #TransWomenAreWomen)
Edith Clarke was the first woman to be awarded an electrical engineering degree from MIT, and the first woman to be professionally employed as an electrical engineer in the US. She worked on the hydroelectric systems that, to this day, provide hydropower at the West Hoover Dam. Black and white, early 20th century photo of Edith Clark: a
Mary Jackson was a mathematician and aerospace engineer at NACA, later to become NASA. She was NASA's first Black female engineer. She particularly worked in understanding air flow, including thrust and drag forces—important for aircraft design. Mid-20th century black and white photo of Mary Jackson: a Bl
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Mar 16, 2022
Another thread of easily confused words, you say?

Oh all right then! 🧵

((un)fortunately there’s plenty of material, because English is a pain in the neck*)

(*when did it become bum/backside/arse? Surely a pain in the neck is worse…?)
allude: indirectly call attention to something (“she alluded to the events of last Friday”)

elude: escape from something (“they eluded their pursuer”)

Similar-sounding but with two different meanings. Remember to ALLude means to cALL attention.
which reminds me of…

peruse: examine carefully

pursue: chase/continue along

It only takes a small slip for autocorrect to bite you here. Imagine splitting the words –PER USE vs. PUR SUE – and remember someone might purSUE a legal claim where someone else was SUEd.
Read 8 tweets
Mar 11, 2022
Right, let’s do some more easily-confused words!

Plus hints to (hopefully!) help you remember which is which…

🧵
Pour: to make liquid flow

Pore: a small opening
OR, gaze intently (she pored over the map)

Imagine the U in poUr is a cup. You wouldn’t want to spill anything on your important documents!

(There’s also “poor” but that doesn’t seem to cause so much trouble)
Discreet: careful in speech/actions, or deliberately unobtrusive

Discrete: individually separate/distinct

This one’s easy: the two Es in “discrete” have a T between them, so that’s the one that means separate…
Read 8 tweets
Mar 6, 2022
I am a proofreader. Would you like a list of words which are very nearly, not not quite, the same?

Of course you would 😆
All right… 🧵
Forgo: opt out/abstain

Forego: go before

(Remember FOREgo means beFORE)
Complement: completes something/adds features

Compliment: a nice thing to say

(I always find myself double-checking this one. Remember compLEment means to compLEte)
Read 20 tweets
Mar 3, 2022
It's time for my final (sniff 😥) episode of @TheCrashCourse #OrganicChemistry

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Review the difference between the easily confused nitric acid and nitrous acid...
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Jan 18, 2022
I’ve been asked to make a post about my twisty-turny career for #YoungScientistNetworking, because not all PhDs end up in academia. So, here goes… 🧵
1/8 Image
I finished my chemistry PhD in 2000, at Nottingham University (home of @periodicvideos!). I briefly contemplated working for Bio-Rad, because I’d done a lot of infrared spec, but instead I joined UoN’s web design team (it was a pretty new thing, then)
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After two years I decided I missed the science. So I left to complete a teacher-training course. I’d go on to teach secondary science, particularly chemistry, on and off for nearly twenty years
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Read 8 tweets

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