Talk:Porthole

This article is within the scope of WikiProject Ships, a project to improve all Ship-related articles. If you would like to help improve this and other articles, please join the project, or contribute to the project discussion. All interested editors are welcome. To use this banner, please see the full instructions.ShipsWikipedia:WikiProject ShipsTemplate:WikiProject ShipsShips articles

Glass

	This article is within the scope of WikiProject Glass, a collaborative effort to improve the coverage of glass on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.GlassWikipedia:WikiProject Physics/Taskforces/GlassTemplate:WikiProject Glassglass articles
???	This article has not yet received a rating on the importance scale.

why are they circular?[edit]

anyone? Cramyourspam (talk) 23:25, 2 January 2013 (UTC)[reply]

Assuming this is a general question about portholes, try asking at the reference desk. Regards, Orange Suede Sofa (talk) 00:37, 3 January 2013 (UTC)[reply]

One obvious reason is that it avoids the high stress associated with corners. Ships are subject to a lot of stresses coming in at all angles as they bob around on the water, thus they are subject to a lot more than the chiefly vertical loads (from gravity and the weight of the structure above them) that windows on land experience. — Preceding unsigned comment added by 192.158.48.14 (talk) 10:10, 23 October 2015 (UTC)[reply]

Origin of the term porthole[edit]

The us navy library page that the quote was taken from (http://www.history.navy.mil/library/online/origin.htm#por) states in it's privacy policy "All information on this site is in the public domain and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested." (http://www.history.navy.mil/warning.html) — Preceding unsigned comment added by Jerdwyer (talk • contribs) 05:11, 23 January 2014 (UTC)[reply]

The source used is factually inaccurate in at least one respect. King Henry VI had died in 1471 but it was King Henry VII who had usurped the throne in 1485. The source could be paraphrased so as to give the correct king but a more accurate source for the origin of the term, 'porthole', would be better (if one can be found).--GrizzlyG (talk) 22:58, 12 February 2014 (UTC)[reply]

King Henry the sixth ?[edit]

King Henry the sixth wanted it done this way, in 1485 ?

Umm no. He was dead quite a long time before that.Lathamibird (talk) 22:18, 11 October 2015 (UTC)[reply]