newshound wrote:
On 3/15/2017 1:15 PM, James Wilkinson Sword wrote:
On Wed, 15 Mar 2017 11:55:07 -0000, Andrew Mawson
wrote:

"James Wilkinson Sword" wrote in message
news
I just bought a self bleeding valve to fit into a half inch thread.
What
arrived was 3/4". It's sold as 1/2" BSP, and according to this page,
1/2"
BSP is meant to be 3/4". WTF?

https://en.wikipedia.org/wiki/Britis...e_thread_sizes

It never ceases to amaze me that tit bits of knowledge that I've
swept up
and stored over my considerable years from childhood have never come
to the
attention of the younger generation. We as kids were playing with BSP
threads, Whitworth and BSF nuts and bolts, and even UNC / UNF and
occasionally BSCy and NPT . But in those days we did real things,
schools
had workshops with real machines, and we made real objects. Nowadays its
virtual models and people know virtually nothing apart from how to push
buttons !!!

Nowadays we normally use more sensible measurements. Metric that you
can easily divide by ten to get the next size. A 15mm pipe that
actually measures 15mm.


Predictably, I am with Andrew.

Standardisation, of course, started in the UK in the days when the world
was a very much less connected place.

I'm just waiting for the Brexiters to say we should ditch all this
Froggy metric stuff and get back to proper Imperial units (like they
still use in Trumpland).

You mean the imperial people with 2L bottles of coke?