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why are they circular?

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.

Origin of the term porthole

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 ?

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]

@@ Line 7: / Line 7: @@
 anyone?  [[User:Cramyourspam|Cramyourspam]] ([[User talk:Cramyourspam|talk]]) 23:25, 2 January 2013 (UTC)
 :Assuming this is a general question about portholes, try asking at the [[WP:RDM|reference desk]]. Regards, <span style="font-variant:small-caps">[[User:Orange Suede Sofa|<font color="DarkGreen">Orange Suede Sofa</font>]]</span> ([[User talk:Orange Suede Sofa|talk]]) 00:37, 3 January 2013 (UTC)
+::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.
 ==Origin of the term porthole==