A Paper Pyramid Map of the Earth
A Tetrahedron wanting to be a Sphere!
This site has some remarkable downloadable "globes", some cubic, some icosahedral, and the simplest being tetrahedral, ie, a triangular based pyramid, with all faces being equilateral triangles.
Here are some quick tips on constructing it, intended for school kids.
- sharp scissors - the squeeze type called "Squissors" are the best, but any small, sharp scissors will do.
- white "PVA" type hobby glue is what I have found works the best.
- a bamboo kebab skewer is very useful, for spreading glue and also for pressing the glued surfaces together in the tight corners.
- you need something to "score" the fold lines. A sharp, hard pencil (H, or 2H, but an HB will do); an empty ball-point pen is even better, as it leaves no mark, just a nice smooth crease. You can also use the sharp point of the skewer.
Here you can a ruler close to some fold marks, ready for scoring.
I've scored the lines with an H pencil. Best to do this before any cutting.
It helps to rough cut most of the card away, leaving a centimetre to 2 all around.
This shows my Squissors.
All cut out.
The first fold done. Do this gently using your finger tips. For some folds it helps to place the model on a flat surface, like a table.
All the folds are now done.
It is important NOT to use too much glue. A thin line is all you need. Spread it out with a scrap of card, or the tip of a skewer.
I've marked the first tab to glue with "A"s on the matching surfaces.
First edge glued.
Ready to glue the rest.
And all done!
This page http://tardus.net/earthPyramid.html
published: 12 Oct 2015
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