Confused by a magnet

.

Top of left arm … thankfully

My ‘Tigger Bounce’ should be restored for a while

… next one is scheduled for the Ides of March [by which time, I will likely be fading again]

Meanwhile: The magnets have not yet arrived.

MichaelG.

Don’t hold your breath, chaps … message from ebay this morning informs me that my item “is being posted” today, and I should expect it by 04-Jan-2023

MichaelG.

Michael

i ordered some from zoro and had the email this morning saying its being posted and surprise Parcelforce has just turned up with the magnets

3 boxes of 10 arrived in a much oversized plastic bag

each magnet has a nylon washer between it and the keeper

Thanks for the info, Ian

… looks promising.

MichaelG.

They do marvels for my dad. He missed them for over two years due to covid restrictions, but when he finally got a 'top up course' it worked wonders.

There's always intravenous Marmite as an option...

Neil

Some years ago, I had B12 injections along with some other injection (don't recall what, except it was nominally very expensive but the health service picked up the tab) - in the stomach .... actually no worse than in the arm.

When various blood levels stabilised a bit, I was taken off those injections and switched to Revlamid (Thalidomide) instead (really, really expensive ... ~$10,000 a month and highly controlled for obvious reasons).

Just a week ago, the Oncologist asked me if I was "still" taking the B12 tablets because some levels looked a bit iffy. "No" I said "no one ever said I should". I am now.

.

Mine arrived today … in a small ziplock bag in the enormous mailer

Three magnets but only two nylon washers and keepers

They are much better finished than I expected, and it is now evident that the magnet is only perhaps 0.2mm below the rim of the pot … the appearance is deceptive, because the magnet does not sit concentric in the pot [the gap is zero at one location]

Pushing them around [all the same way up] on a melamine-faced board, they settle at about 40mm centres, and rotation has no effect.

With the rim down, they will just jump about 4mm to contact a steel plate

With the rim up, this increases to a much more dramatic leap of about 20mm

They don’t initially give the impression of being very strong … until they attach to a flat surface … and then it’s like a limpet !!

… I will try a weight-lifting test tomorrow

So far, I am quite impressed.

MichaelG.

.

Note: All my ‘measurements’ are approximate … I’m just faffing about with them

Edited By Michael Gilligan on 23/12/2022 21:45:54

I have just bought this App [for the princely sum of £0.89]
**LINK**

https://apps.apple.com/gb/app/magnetometer-pro/id1457545269

Which gives a reading of around 3000 microtesla in close proximity to the magnet

… compared with a general background of about 150

No idea how accurate it might be, or even exactly where the magnetometer is located in an iPad Pro 9.7”

… but it seems like a pretty big number

MichaelG.

.

Edit: __ I have just found my bedtime reading : 

https://www.dlhonline.co.uk/media/wysiwyg/dlhonline/PDF/guide-to-permanent-liftin-magnets2.pdf

Very much the wrong scale … but there may be something useful there

Edited By Michael Gilligan on 23/12/2022 22:30:59

This App looks more generally useful/interesting : **LINK**

https://apps.apple.com/gb/app/phyphox/id1127319693

… and it’s free

MichaelG.

That looks right interesting. I shall try that as soon as I find out where the iPad went.

Thanks, Michael!

A quick check with my trusty Silva Compass [not a patch on Nick’s but it does fit nicely in the camera-bag] reveals that the bottom of the magnet, and thereby the whole of the pot, is a North pole.

MichaelG.

.

… I am now wondering what effect that single line of contact has on the magnetic performance

… would it be even more effective if the magnet was truly centred in the pot ?

The practicality of doing this is questionable, but I would welcome opinions.

Edited By Michael Gilligan on 24/12/2022 10:01:13

That tallies with what I found on my simple countersunk one.
The side with the countersink was south

Bill