## Search found 83 matches

Sun Nov 04, 2012 9:42 pm
Forum: Polyhedra
Topic: Gilson: Polyhedra - A New Approach
Replies: 20
Views: 42626
removed
Sun Nov 04, 2012 9:40 pm
Forum: Polyhedra
Topic: Gilson: Polyhedra - A New Approach
Replies: 20
Views: 42626
Sun Nov 04, 2012 5:22 pm
Forum: Polyhedra
Topic: Gilson: Polyhedra - A New Approach
Replies: 20
Views: 42626
http://i112.photobucket.com/albums/n174/oxenholme/equatorialpentagons.jpg And here is my dreadful attempt at some equatorial pentagons. I used two pieces of card, sort of heptagonal with the pentagons round the periphery. Gloriously inaccurate, but it's more exploratory than anything else. Next ste...
Thu Nov 01, 2012 6:37 am
Forum: Polyhedra
Topic: Gilson: Polyhedra - A New Approach
Replies: 20
Views: 42626
What do you want to make the equatorial pentagons coplar to - I don't see how it can be coplanar or in a parallel plane to any of the larger petagons. For example, starting with the white equatorial pentagon, how would you navigate to the coplanar pentagon ? I'll listen out at the weekend, but you ...
Wed Oct 31, 2012 1:24 pm
Forum: Polyhedra
Topic: Gilson: Polyhedra - A New Approach
Replies: 20
Views: 42626
I think Chapter 24 contains some equations or whatever they are - it keeps on saying it's simple - for the dimensions of the two types of pentagon. I wouldn't have a clue how to use them. I wonder if one way would be to make a couple of seven sided "pyramids" , and to mount them on a pencil or the l...
Mon Oct 29, 2012 10:58 am
Forum: Polyhedra
Topic: Gilson: Polyhedra - A New Approach
Replies: 20
Views: 42626
The mathematics in the book is lost on me.

I do very much like the look of the Heptagonal Pentagonised Globoid depicted in Fig 48, but sadly there do not appear to be any clues on how to construct the symmetrical but otherwise irregular pentagons used therein.
Tue Oct 02, 2012 8:43 am
Forum: Polyhedra
Topic: Gilson: Polyhedra - A New Approach
Replies: 20
Views: 42626
I've ordered one too...
Thu Mar 15, 2012 11:13 am
Forum: Polyhedra
Topic: Icosahedon 5 compound - anyone tried making one?
Replies: 7
Views: 17520
Six Dodecahedra

My second attempt. My first attempt was cut short when it got demolished by a football flying across the room!
Wed Mar 14, 2012 8:58 am
Forum: Polyhedra
Topic: Icosahedon 5 compound - anyone tried making one?
Replies: 7
Views: 17520

To my surprise I have made the compound of Five Icosahedra - it must have been about twenty years ago.

It's on the bottom row in this picture, second from the right...
Mon Mar 05, 2012 2:17 pm
Forum: Stella Forum
Replies: 1
Views: 9987

I've been fascinated by polyhedra ever since 1961 or thereabouts when I got introduced to them at school. From time to time I post photos of my own polyhedra on here (via Photobucket) - Peter Kane shows some of his too. Please tell us about some of the polyhedra that you've been making, and post pho...
Mon Mar 05, 2012 2:10 pm
Forum: Polyhedron Models
Topic: Can you see what this is ?
Replies: 3
Views: 15250
This polyhedron is one of 5 that I intend to make. Its tetrahedral equivalent is a stellation of the regular dodecahedron. I made it last year. Its octahedral and cubic equivalents are both stellations of the pentagonal icositetrahedron. I made both a year or two ago. Its icosahedral equivalent is a...
Mon Mar 05, 2012 2:02 pm
Forum: Stella Forum
Topic: 2 Newbie questions
Replies: 2
Views: 12414
Is the mitre angle the angle you would need on the edges if you were to make the polyhedron from a material thick enough to need mitring? The Cube's dihedral angle is 90 degrees, so the mitre angle is half - i.e. 45 degrees. My last computer died a death, so I haven't got Stella at the moment, so I ...
Mon Mar 05, 2012 1:59 pm
Forum: Polyhedra
Topic: Icosahedon 5 compound - anyone tried making one?
Replies: 7
Views: 17520
Five Icosahedra looks a pain to make in such a manner that the end result is rigid. I fancy having a go. The problem being that the "trough" double tabs (thirty of them) are not continuous colourwise. It will take a lot of care adding reinforcement without getting balsa cement where it shouldn't be....
Fri Mar 02, 2012 9:33 am
Forum: Polyhedra
Topic: Icosahedon 5 compound - anyone tried making one?
Replies: 7
Views: 17520
I've made the compounds of 5 dodecahedra and 5 rhombic triacontahedra, but not 5 icosahedra. Sadly yet another computer has bitten the dust, so I no longer have access to Stella, but I've made several polyhedral compounds with coplanar pairs of faces. I've always split the common area down so that t...
Mon Jan 31, 2011 7:56 am
Forum: Stella Feature Requests
Topic: Colouring Snubs
Replies: 7
Views: 20135
I made that snub many moons ago using plain white card. Seeing the colour representations above has whet my appetite to having a go at making it in colour. I would need six colours for the pentagrams and pentagons, another ten colours for the icosahedral triangles. Would I get away with the standard...