Whodathowtit?

A Maths book in the 'Best Sellers'?

Just read the book. (well, it is one of my interests)

It is small and compact, which I guess is unusual for a Calculus book! Not difficult or demanding of mathematical knowledge.

That said, it contains nothing not already easy to find in previously published books on this topic.

Ain't it odd how things get promoted to fashionable status!

Worth a read if you want to bring back to mind all that stuff you had forgotten about calculus.

Does this mean that Rachel Riley from 8 out of 10 cats does Countdown is your hero(ine) ? and not only because of her legs!

Never watched it, (either of them) so don't know of her.

Very selective concerning what I watch ont telly.

I think it is mostly rubbish, so usually only watch news and film, and maybe the occasional drama.

I was an engineer for the first eight years of my career, then did something completely different for the next half century.

I always thought that there was a kind of elegance in Calculus, so I guess the interest remained long after my using of it had ceased.

Have bought another calculus book since, but to get the most from it, I really need the software package called 'MAPLE'. I cannot afford it! Four figure sum for personal licence!

Dee two Y by dee X squared if memory serves.

I think there are two branches, differential and integral calculus.

Did it while doing my HNC Mech Eng.

Clever stuff, not sure if I could do it now.

I had enough trouble with Trigonometry, spent 35 years in a Mechanical Maintenance role and can't remember using it, ended up with another company where I used it practically every day, What a (re)learning curve that was!!

I recommend a book by Simon Winstanly titled EXACTLY history of engineering very good read.

I think I have come across that before, in relation to precision measurement.

Have not read it though, so thanks, bentlegs, for the recommendation. Will certainly give it a read if I can pick up a copy for a fair price.

Whilst on this topic: I once had an old fashioned thimble-screw micrometer.



But it seems to have walked.

For less than a tenner, I had also picked up a digital micrometer from ALDI



I am long time retired, but do like much to tinker wih stuff. However, it is only around once or twice a year when I need to measure summut with such accuracy.

So, I dig out the device. reads both inch and metric, will have no need for converting....
Everything ready to go....
and....
The battery is drained!

No measurement until I can get replacement.

New/digital not always superior!

Ena mal up as an apprentice many years ago I was presented with a 0 to 1 micrometer then my dad bought me a second hand 1 to 2 micrometer over the Christmas holiday our workshop was broken in to, alas most of my tools had gone, I bought the very same vernier gauge that you show. I am now 86 years old so too old to use them although I sold the micrometers one,