tag:blogger.com,1999:blog-22973357.post3396687376511430683..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Eyeglasses and the James Webb Space TelescopeSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger19125tag:blogger.com,1999:blog-22973357.post-50491004686403628002008-08-05T05:06:00.000-04:002008-08-05T05:06:00.000-04:00Eyeglasses evolved over time, from beryl glasses t...Eyeglasses evolved over time, from beryl glasses to glass glasses, polycarbonate glasses and now <A HREF="http://www.pinhole-glasses-direct.com" REL="nofollow">pinhole glasses</A>.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78359702607619270712007-01-28T18:19:00.000-05:002007-01-28T18:19:00.000-05:00arun, you are quite right.arun, you are quite right.CarlBrannenhttps://www.blogger.com/profile/17180079098492232258noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-13846583784812423662007-01-28T16:17:00.000-05:002007-01-28T16:17:00.000-05:00Is there any truth to the rumor that the original ...Is there any truth to the rumor that the original NASA design had heptagons? They were redesigned to pentagons for side conservation, then a compromise was hammered out. <br /><br />(The two extra sides/polygon were to be recycled into T-squares with 80-degree angles. The angle savings thereform were then summed into gyroscope replacements for ISS FUBAR, with pi=3 for diversity hire engineers).Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-5191070913394849752007-01-28T16:13:00.000-05:002007-01-28T16:13:00.000-05:00Director of NASA is alright although there could b...Director of NASA is alright although there could be more cultivated ways to name it. ;-)Luboš Motlhttps://www.blogger.com/profile/17487263983247488359noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-65353650879429194532007-01-28T10:06:00.000-05:002007-01-28T10:06:00.000-05:00Dear all,
thanks for the links and information ab...Dear all,<br /><br />thanks for the links and information about the etymology of <i>Brille</i> and <i>beryl</i>!<br /><br /><br /><i>Is there some international agreement on how to avoid clogging up the Lagrange points with space junk?</i><br /><br />I don't know... But then, all those satellites are not located exactly at the <a href="http://www.esa.int/esaSC/SEMM17XJD1E_index_0.html">Lagrange stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-75059336970920697252007-01-28T00:56:00.000-05:002007-01-28T00:56:00.000-05:00Carl, the blurb says "The primary mirror of the Ja...Carl, the blurb says "The primary mirror of the James Webb Space Telescope will consist of 18 honeycomb-shaped segments made of beryllium", which is why I thought of Be metal rather than beryl.Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-80234495270499325932007-01-28T00:10:00.000-05:002007-01-28T00:10:00.000-05:00Very interesting information! I'm glad that we do...Very interesting information! I'm glad that we don't make glasses from beryl anymore or we'd never afford them.Rae Annhttps://www.blogger.com/profile/10239791074376508016noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-62938649169364525252007-01-27T18:17:00.000-05:002007-01-27T18:17:00.000-05:00the origin of "beryl" is in ancient India, as per ...<i> the origin of "beryl" is in ancient India, as per the Internets.</i><br /><br />rubbish - it's derived from Klingon <a href="http://dictionary.klingonreference.com/define.asp?word=bej">bej</a> <a href="http://dictionary.klingonreference.com/define.asp?word=jIl">jIl</a>(watch the neighbor)Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67950332165223292882007-01-27T17:56:00.000-05:002007-01-27T17:56:00.000-05:00Arun, it's quite unlikely that you'd get Be metal ...Arun, it's quite unlikely that you'd get Be metal dust from beryl, which is only about 4% Be, the rest being an alumino-silicate. The metal is similar to aluminum in its attraction to oxygen. The problem with the dust will be from the mineral dust itself, which is bad enough, but not as bad as <a href=http://www.inchem.org/documents/ehc/ehc/ehc106.htm>Be metal</a>CarlBrannenhttps://www.blogger.com/profile/17180079098492232258noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67758433932987872972007-01-27T17:19:00.000-05:002007-01-27T17:19:00.000-05:00A good majority of the google links have beryl ult...A good majority of the google links have beryl ultimately deriving from Sanskrit, and some ultimately from Tamil, and so, folks, the origin of "beryl" is in ancient India, as per the Internets.<br /><br />:)Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-42741091632120880192007-01-27T17:02:00.000-05:002007-01-27T17:02:00.000-05:00One of the etymologies at dictionary.reference.com...One of the etymologies at dictionary.reference.com for "beryl" is as follows:<br /><br />"[Middle English, from Old French, from Latin bēryllus, from Greek bērullos, from bērullion, from Prakrit veruliya, from Pali veḷuriya; perhaps akin to Tamil veḷiru or viḷar, to whiten, become pale.]"Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-90507047890768636092007-01-27T13:36:00.000-05:002007-01-27T13:36:00.000-05:00"Brille" actually comes from the Czech word "brýle..."Brille" actually comes from the Czech word "brýle" which means "glasses". ;-)<br /><br />I hope that James Webb is a different James Webb than the hateful Gentleman who responded to the State of the Union speech.Luboš Motlhttps://www.blogger.com/profile/17487263983247488359noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-16029142550496003362007-01-27T13:12:00.000-05:002007-01-27T13:12:00.000-05:00Hi Bee, definitely a movie
just before the Zulu de...Hi Bee, definitely a movie<br />just before the Zulu defeated the British redcoats - like Custer's last stand when the cavalry got slaughtered by the Indians - and when white men, rifles and spectacles (or monocles) were rare curiosities in Africa - and africans still ran around in loin clothes and hunted food with spears<br /><br />And long long before UV sunglasses or space telescopes and QUASAR9https://www.blogger.com/profile/00593390598251093182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28063967721950907362007-01-27T13:10:00.000-05:002007-01-27T13:10:00.000-05:00Which leads me to wonder - is there some internati...Which leads me to wonder - is there some international agreement on how to avoid clogging up the Lagrange points with space junk? I think there is a protocol for geostationary satellites, and what has to happen at end-of-life.Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-89696043444741873492007-01-27T09:39:00.000-05:002007-01-27T09:39:00.000-05:00Hi Quasar,
I love that story with the Zulu leader...Hi Quasar,<br /><br />I love that story with the Zulu leader! Was that a documentation or a movie? Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-68192975052385568882007-01-27T09:29:00.000-05:002007-01-27T09:29:00.000-05:00Hi Stefan, curious thing
when we talk of eyeglasse...Hi Stefan, curious thing<br />when we talk of eyeglasses<br />it always reminds me of a film<br />Zulu - <em>I think</em><br />Where the African leader (who we'll presume had 'normal' sight) meets a white man wearing spectacles, takes them off him - has a look thru them, and states<br />"this man doesn't want to see the 'real' world"<br /><br />Of course it is a metaphor - but his comment was QUASAR9https://www.blogger.com/profile/00593390598251093182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-6462825054752645672007-01-27T07:13:00.000-05:002007-01-27T07:13:00.000-05:00Did you know that Beryl is also the name of a Linu...Did you know that Beryl is also the name of a Linux window manager(sheer eye-candy)?<br /><br />Actually, I came to know about the original Beryl only through that! :D<br /><br />Very informative post as usual, Stefan!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-39938293391104025752007-01-26T21:12:00.000-05:002007-01-26T21:12:00.000-05:00Thank you, Arun!
I wonder if they'll goof up on t...Thank you, Arun!<br /><br /><i>I wonder if they'll goof up on the focal length of this mirror like they did with Hubble :)</i><br /><br />They better won't, since they will have a hard time to send a repair mission to the <a href="http://www.jwst.nasa.gov/orbit.html">Lagrange point</a> ;-)stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-65310400930378725972007-01-26T20:48:00.000-05:002007-01-26T20:48:00.000-05:00I love the connections you make between things!
I...I love the connections you make between things!<br /><br />I believe Be metal dust can be quite toxic, and so grinding/machining this mirror has to be done with great care for the workers. <br /><br />Completely tangentially I wonder if they'll goof up on the focal length of this mirror like they did with Hubble :)Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.com