Documentation

1-11-07

A cylinder with a ‘cap’ cylinder fitting snugly over the top to prevent rain damaging the soluble paper on the outside of the inner cylinder. The inner cylinder is attached to a largish base for stability. The outer cylinder rests on/around the inner cylinder. The top of the outer cylinder has a small hole in the middle to let sunlight pass through. Most edges printed with the 3D printer need to be at least 3 millimeters thick otherwise the pieces may be too fragile for use. Each cylinder needs to be translucent for the sunspot to be seen on the other side. The inner cylinder has a sheet of paper with the correct markings on it. Easier to use already made cylinders rather than make our own or have a company/school make the cylinders for us. Preferably a local supplier of plastic(?) cylinders. We also need to focus on price, not that we are stingy but who wants to pay a queens ransom for a product that may not kick off?

Materials Glass? Fragile, expensive. Plastic? Acrylic? Perspex? Poly-carbonate Plastic? Toughest transparent plastic on the market. Price?

Cylinder Gap Not too tight, nor too loose. Too loose: Paper may not be in the correct position. Too tight: Surrenders ease of use, paper may crumple when outer cylinder is fitted.