Geodesic Dome 

 

Definitions first...Geodesic means "the shortest line possible between two points on a  sphere or other curved surface".

 

The Geodesic dome was developed by an American engineer, one Richard Buckminster Fuller. Famously the design boasts a number of unique features: it can be fabricated (somewhere, anywhere) and the entire structure can be  placed on the ground and immediately be stable and strong. There are no limits to the size of the structure - no matter how big you make it, it will always be strong enough  to support itself and a lot more besides.

Click on the images - right - to see them in more detail. It  bears repeating (from elsewhere  on this site) that all the seams on this piece and every other piece  is  created with a 100 W soldering iron . It is the tin/lead alloy of the solder  which as it cools from liquid to solid on each side of the glass grips the glass. No more and no less. 

Applications of the Geodesic  dome have been many and various  over the years: It has been used as a simply constructed dwelling to  provide cheap and effective  shelter, to a protective sphere that contains radar installations on land and sea,  to massive exhibition  constructions, roofs of stadia etc etc. 

This piece was  particularly difficult to make. Difficult not just because of the complexity, but as the discrete glass pieces cannot be pulled or tugged in different directions each must be exactly cut to size (see dimensions below). As small alignment errors inevitably creep in it becomes ever more difficult to constrain the errors  so that everything else fits as it should. Inevitably there was some run out, but unless you know where to look, it is not obvious  !

 

I should explain that the dome  is  not simply a lot of  of pieces of glass  placed together over a semi circular former  (rather as Tiffany lamps  from the far east are made,  where  various shapes and colours of glass are randomly put  together on a former)  but, a true  geodesic dome.

 

There are 105 discrete triangles  in the piece and they are of only  two different sizes arranged in a very  particular way.   In this scaled down piece   one triangle is of sides 52, 52, 61 mm and  used to make  6x pentagons, the other triangle  is of sides 62, 62, 61 mm and is used to make 10x hexagons. Since you ask (!!), the trick is to build the hexagons and pentagons  (as individual items )  first and to then assemble them in a manner that mitigates run out and error. Approximate diameter  of the finished piece is 300 mm.

 

Once you have "got your eye in" you will see that the top of the dome is a pentagon, to each face of the pentagon is a placed a hexagon, between the hexagons are five more pentagons, then more hexagons and so on....

The base is some old and genuine mahogany. It is a sandwich of two layers running at 90 deg to each other. This will prevent the base distorting. The base was routed out and finished with "brushing french polish" wire wool and wax polish. 

Click on the image to the right for more photographs ...

 

 

2015 . All the wardian cases you see here were designed and made by Martin de Little. Photography  with  (the exception of  the Geodesic dome examples)  website design and construction by

Martin de Little