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 CAD / LDraw Files / Parts / 5258
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Subject: 
RE: Onion Dome (part 44511) from Orient Expedition sets
Newsgroups: 
lugnet.cad.dat.parts
Date: 
Sun, 16 May 2004 21:40:54 GMT
Viewed: 
7118 times
  
> > I would have to disgree.  The part is half a dome - it takes two • parts
> > to make a complete dome,
> I would argue that two parts back to back make something that is not an • actual
> dome, but rather some shape never seen in reality.

According to my dictionary a dome is any curved or vaulted roof.  It
does not have to be circular, or even regular.  The fact that something
doesn't exist in reality is hardly a reason to reject a name for what is
a toy.

> > The fact that the resulting shape is not half of a circle is largely
> > irrelevant IMHO.
> I would disagree, it is in fact highly relevant. If I take an idealised • onion
> dome and divide it in half, I do not get this part.

According to my book on Russia and the Winter Palace, there is no such
thing as a standard onion dome, they squashed them to fit as necessary.

> Compare to the panel quarter cylinder. That actually IS 1/4 of
something.
Agreed.  It is a quarter of what you get if you put 4 of them together,
as is this part half of what you get if you place two of them together.

> > Even if you remove the "extra" bit at the open side,
> > the part is not circular.  It varies from circular at the top, • through
> > an series of increasing and then decreasing elipses, and back to
> > circular (but offset from the top circle by 20LDU) at the bottom.
> > 
> > You can see this placing two at right angles and then comparing the • z=0
> > and x=0 plane profiles
> 
> All the above is true, and very nicely supports my argument that this • part is
> not half a dome.  (thanks!) Calling it 1/2 would lead the user to • believe that
> perhaps, if they place two back to back they would get a complete dome. • They
> will not.

Your arguement is flawed by assuming that domes are circular, or even
elliptic.  They are not.  A dome is any curved roof.  This part is quite
clearly a curved roof.  Place two back to back and you get a whole
curved roof, therefore one must be (by mathematical definition) half of
the whole.

OK, so what would you call it that enables a user to locate the part?

And I still need to know the Category for it

thanks

William



Message has 1 Reply:
  Re: Onion Dome (part 44511) from Orient Expedition sets
 
(...) I said idealised, not standard. (...) I am sure they did. But they didn't make things that had figure eight cross sections much of the way up, if I am not much mistaken. (...) It is more than that, it is a quarter of a *cylinder*, a geometric (...) (22 years ago, 16-May-04, to lugnet.cad.dat.parts)

Message is in Reply To:
  Re: Onion Dome (part 44511) from Orient Expedition sets
 
(...) I would argue that two parts back to back make something that is not an actual dome, but rather some shape never seen in reality. (...) I would disagree, it is in fact highly relevant. If I take an idealised onion dome and divide it in half, I (...) (22 years ago, 16-May-04, to lugnet.cad.dat.parts)

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