@VergaraLautaro I'm surprised by the gap between 1911 and 1934.
I would expect the lack of magnetic field inside to be theorized ~immediately (or at least once it was noticed that the zero resistance also applied to AC), given that Lenz's law was formulated in first half of 19th century.
So was it just hard to directly observe the magnetic field around superconductive samples?
@robryk
Both World Wars had an impact on research, also on superconductivity.
Field expulsion does not follow from Lenz’s law, since perfect conductor would produce currents to *maintain* a field that was present already, and for years that’s what experiments seemed to show.
Here’s a book-length history that does a nice job of describing the intellectual history and putting it into social and political context.
https://www.rutgersuniversitypress.org/the-cold-wars/9780813532950
It works for me. Is it 404 for you, or is the website unavailable?
Anyway, the book is "The Cold Wars: A History of Superconductivity" by Jean Matricon and Georges Waysand.
@VergaraLautaro @robryk
Looks like the link from the image is broken, but the link itself works? Is this a Mastadon bug?
(By image you mean preview, right?)
I confirm that this is the case for the post when viewed on fediscience.org, but it does not happen for the post when viewed e.g. on my instance. The broken link is https://www.rutgersuniversitypress.org/book-details/
Each instance generates the preview on its own when it receives a post. I suspect that when fediscience.org did that, the website in question issued a redirect to the broken link for some reason. Let me try to find the raw form of the post to confirm what was actually sent out though.
If you take a look at https://fediscience.org/@jsdodge/109480278297608998.json, you can see that the wrong link is nowhere present. So, it seems that fediscience.org managed to break the preview. Can you try replying with the same link (e.g. in this conversation) to see if that's repeatable?
@jsdodge @VergaraLautaro @FrankSonntag
It seems that the problem is that the actual page declares that the broken URL is its canonical URL in HTML:
```
$ curl -s https://www.rutgersuniversitypress.org/the-cold-wars/9780813532950/ | grep canonical
<link rel="canonical" href="https://www.rutgersuniversitypress.org/book-details/" />
```
So, you're arguably doing the correct thing and the website is broken.
@FrankSonntag @jsdodge @VergaraLautaro
qoto.org uses Glitch + some other customizations, so I would assume that this changes _something_ in the preview generator.
I've emailed someone from that publisher (they don't have a published webmaster contact) about that issue. I would have ccd you, but couldn't find an email address.
@FrankSonntag @jsdodge @VergaraLautaro
Ah: the preview works _in the logged in view_, but also doesn't on the publicly-available single-thread page. So, there's probably no inter-instance difference here, but only some very weird difference in how Mastodon renders previews in different UIs.
@robryk @jsdodge @VergaraLautaro thanks for helping with the troubleshooting. Fediscience uses a vanilla Mastodon version and I am not sure why it would behave differently from others sites w/r to the preview generation.
Given the broken canonical link I believe we are indeed doing the right thing - which raises the question why the preview on qoto.org works:)