Appropriate Advertising
Just watching the British Motorcycle Grand Prix, which is taking place in the rain. Lots of adverts for Visit Spain.
How appropriate!
Looking for Ferrous Inclusions in Copper Wire
One of the first real research projects I ever did, was to look for small ferrous inclusions in copper wire. This was during a vacation job from Liverpool University at Enfield Rolling Mills. It was I think the third summer I spent there and it was all good training for the future.
My problem was to look for small pieces of iron in thin copper wire, that was being drawn smaller to make electrical cable. Even the smallest piece of iron of the order of ten micrograms can do bad damage to the dies that shape the copper. To complicate matters the wire was travelling at something like 3,000 feet per minute, although I can’t remember exactly what the speed was.
I remember building a frame from Dexion, with pulleys at three corners, so that a cotton sash cord could be passed round these and an electric motor at the fourth. The cord was used as I could slip straightened lengths of wire into it to simulate the wire. I can also remember drilling the wire down its length to insert very small pieces of iron in the middle. The whole was sealed with copper wire, as I wanted to make sure that the only magnetic material was the speck of iron.
The person who’d tried the problem before had used a detector based on permanent magnets with a coil in the middle. It didn’t work too well, as you got a pulse when the wire entered and left, with only a small blip from the iron.
I used a longer detector based on an electromagnetic coil, with the detecting coil in the middle. The idea was that any eddy currents created by the start of the wire would die down before the detecting coil. I’m not sure if I got the maths right, but it did work and I got a nice one cycle wave on the Cossorscope, with two smaller ones when the wire entered and left. Note that in those days of 1966, you had to develop miles and miles of paper film to get your results from the oscilloscope. Although I should say that there were plenty of good Textronix ones at the University, but then it was so much better funded than industry.
It wasn’t perfect but it would have been good enough to say that a coil of wire didn’t contain anything bigger than so many micrograms. I think in the end they solved the problem, by better hygiene in the wire drawing, so that there was no need to apply a qualitative test.
But I was rather proud of what I had done as a nineteen year old and have always felt that the technique has other applications.
Cambridge Busway to Open on August 7th
It would appear from this article, that an opening date has been set.
I’ll believe it when it opens!
Hope For Pain Sufferers
Whilst in the university, I picked up a copy of their Research Intelligence newsletter.
It fell open on an article about how Dr. Goebel at the University, has developed a new way to combat chronic pain. It is described here.
Hope For Cancer Sufferers
On Wednesday I was invited around the Cancer Trials Unit at Liverpool University. I have to declare two interests in that my youngest son died from cancer of the pancreas and I contribute in a small way to their research.
It is an impressive unit and the visit left me with the feeling, that if their attitude, thoroughness and methods are repeated in hundreds of other similar units across the world, as I suspect they are, then there may well be some better news for cancer sufferers in the future.
The Anonymous Widower 