[lace] Missing magazines.

[Elizabeth Ligeti]

I have not received either the IOLI Bulletin, or the UK Lace magazines yet.


 

I look, - hopefully - for them every day, - but so far without success.

 

How confusing to have 2 Blair Castles!!

 

Regards from Liz in Melbourne, Oz.

lizl...@bigpond.com

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[lace] RE: lace-digest V2016 #39

[Elizabeth Ligeti]

I have not received either the IOLI Bulletin, or the UK Lace magazines yet.


I look, - hopefully - for them every day, - but so far without success.

How confusing to have 2 Blair Castles!!

Regards from Liz in Melbourne
lizl...@bigpond.com

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Re: [lace] Lace grounds with symmetry

[Veronika Irvine]

Hi Beth,

You raise a very good point.  Any pattern that can be reflected in two 
mirrors at right angles can also be rotated 180 degrees and still look the 
same.  The type of patterns that I am looking for can be rotated and look 
the same but do not have any mirror reflections - like a pinwheel.  Thank 
you for making this observation and helping me clarify what I am looking 
for.


Kind regards,
Veronika 


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Re: [lace] Lace grounds with symmetry

[Veronika Irvine]

Thank you Brenda for your detailed and comprehensive reply.  It is very much
appreciated.

In my description of what I am looking for, I left out an important detail.  I
am ignoring the over and under crossing of the threads when looking for
symmetry.  You can think of it as looking for symmetry in the shadow of the
lace ground (a very crisp shadow) or looking at the lace from a little bit of
a distance, not with a magnifying glass (or for me when I take off my reading
glasses).

You are quite correct that at the level of twists and crosses the over and
under position of threads in CTC has rotational symmetry.  I found this level
of detail a bit too restrictive when classifying patterns by symmetry.  I want
to think of the pattern more from a high level view and the impression of
symmetry it gives to a viewer.

In this light, I would say the pattern Gauze Shape on page 8 of Cook and
Stott's "Book of Bobbin Lace Stitches" has four fold rotation symmetry
(pattern can be turned a quarter turn and still look the same).  The pattern
Braided Leaves 2 on page 125 of C has two fold rotation symmetry (can be
turned a half turn and still look the same).  Another pattern that I would say
has with two fold rotation symmetry is A82 from Viele Gute Grunde Volume 1, a
very lovely Le Puy pattern.  Patterns like Rose Ground 1 on page 65 of C I
would classify, using this shadow criteria, as having only reflection
symmetry.  (To be precise, in Rose Ground 1 there are two different places
where 4 intersecting mirrors can be placed and one place where two mirrors can
intersect.)

Many thanks for your help,
Veronika

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[lace] replies, IOLI and bookmarks

[Elizabeth H Correa]

Hello Arachnes

 

I received some replies and it's true that people pay attention to Arachne.

 

I'm happy because I took back some contacts and make new. Lin, I will post
the bookmark tomorrow! Thank you for all.

 

I will be at IOLI 2016 and before, a week at Berkeley to see Lacis Museum
and The Lace Museum. 

 

And to exercise my English. 

 

I will go California-Indiana by California Zephyr! Whoo hoo! If you have any
recomendation, please, let me know it!

 

Elizabeth H Correa 

www.rendasol.org.br

www.rendatenerife.org.br 

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Re: [lace] Lace grounds with symmetry

[Brenda Paternoster]

Hello Veronika

In bobbin lace, cloth stitch (CTC) has 90 degree rotational symmetry, but not
mirror symmetry.

Additional twists added to each of the pairs, in the same numbers, both before
and after the cloth stitch will retain the rotational symmetry.

A single half stitch (CT) does not have symmetry (although an area of half
stitch ground, if the working angle is 60 degrees, does have rotational
symmetry, but again not mirror symmetry)  It can also have rotational symmetry
when worked diagonally.

This means that you are limited to grounds which are worked with only cloth
stitches or cloth stitches with twists before and after each stitch and half
stitch braids worked diagonally.

Looking through my copy of Cook & Stott’s “The Book of Bobbin Lace
Stitches" (not Bobbin Lace Grounds) I can see:
Gauze Ground - p2
Torchon gauze 2 - p4
Italian Fillet with toile dots - p6 (if placing of the squares is
symmetrical)
Abruzzen Point and flat - p7 (if placing of the squares is symmetrical)
Gauze shapes - p8 (of the shapes are symmetrical)
Torchon ground - p12 *
Devonshire Double ground - p 28
Cane ground - p29
Diagonal Plaid 1 - p 30 (only after the pins are removed and the working angle
adjusted to 45 degrees)
Diagonal plaid 2 - p31
Kat stitch - p38 (will give 60 degree symmetry only if the working angle is
adjusted to 60 degrees)
Devonshire Honeycomb variation - p46 (will give 60 degree symmetry when pins
are removed if working angle is adjusted to 60 degrees)
Rose Ground 1 - p65
Rose ground 4 - p 69
Rose Ground 16 - p80
Rose ground worked straight - p 81
Flags - p92 (not true symmetry but if the narrow half stitch braids are dense
enough it will appear to be symmetrical)
Cord ground - p101 (after pins are removed)
Cord ground in untwisted frame - p102 (after pins are removed)
Valenciennes with picots (not true symmetry, appears to be symmetrical if the
braid is firm enough)
Braided Kat stitch - p122
Braid and cross - p123
Braided squares - p126
Braided leaves with picots (picots are not truly symmetrical but if firm they
appear to be)
Hexagonal braided leaves - p128
Moulinet - p 131 (picots are not truly symmetrical but if firm they appear to
be)
Braided diamonds and squares - p140 (picots are not truly symmetrical but if
firm they appear to be)
Braided flower motif - p147
Devonshire Diamond filling - p166
Marguerites 170
Marguerite a centre de toile - p171
Fat Maltese petals - p173
Thin Cluny petals - p174
Whole-stitch bud - p 234

Some of these are in the slimmer volume by Cook and Stott “Introduction to
Bobbin lace Stitches” (with different page numbers).

*Not shown in either of the Cook and Stott books is Dieppe Ground - similar to
torchon ground on p12 but each pin worked CTpCTT

Brenda

>
> I have been able to find many examples with mirror reflection
> in them.  Roseground is a good example which can be reflected in four
mirrors
> that meet in the center of a square (see the following picture:
> https://tesselace.com/symmetry/ ).  What I
am looking for is grounds that have
> rotation symmetry - like a pinwheel. That is grounds that can be turned
around
> in a quarter, third or half of a circle and still look the same.

Brenda in Allhallows
paternos...@appleshack.com
www.brendapaternoster.co.uk

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Re: [lace] Lace grounds with symmetry

[Beth Marshall]

Hi Veronika

I think most rosegrounds are a good examples of an object with 
rotational symmetry as well as mirror symmetry - you can rotate the the 
lace a quarter or a half turn & the ground still looks exactly the same


Beth
In a sunny but quite cold Cheshire, England

Veronika wrote:

I am studying lace grounds patterns that
have symmetry.  I have been able to find many examples with mirror reflection
in them.  Roseground is a good example which can be reflected in four mirrors
that meet in the center of a square (see the following picture:
https://tesselace.com/symmetry/).  What I am looking for is grounds that have
rotation symmetry - like a pinwheel. That is grounds that can be turned around
in a quarter, third or half of a circle and still look the same.   In the link
above I have included an example of pinwheel symmetry in a little ground that
I discovered using a computer algorithm.

So my question to you is, do you know of any grounds with rotation symmetry?


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