There is no formula but there are certain considerations in deciding the length and width of a straight mirror system. A kaleidoscope that has mirrors that are about eight inches long allows a person to see the image clearly with normal eyesight. Shorter and longer mirrors needs a lens to help a person focus on the image. A wider or larger mirror system allows more light to enter the mirror chamber.

The best way is to get someone to show you how. There is no substitute for actually seeing and doing. There are several books listed on the BKS website Bibliography page which provide detailed instructions for making kaleidoscopes.

Practice, practice, practice. Once again, there is no substitute for the experience gained by constant repetition. Several artists such as Don Doak and Randy Knapp have developed sophisticated cutting boards which aid in consistently straight cutting. However, other artists simply use a Morton© board and straightedge to cut their mirrors. You have to find the way that works best for you.

Several scope making suppliers include:

Clarity Glass Design (Tucson, Arizona) Listed in BKS Retailer Directory

Bullseye Glass (Portland, Oregon)
Delphi  Glass (Lansing, Michigan)
Kokomo Opalescent Glass (Kokomo, Indiana)
Franklin Art Glass (Columbus, Ohio)

Your local hardware store
Scientific parts suppliers

Common liquids used for wet cells include glycerin and mineral oil. Many artists have switched from glycerin to silicone, due to glycerin’s tendency to absorb moisture over time, which may cause eventual leakage problems in the cell.

There are several possibilities. One is to contact established retailers of kaleidoscopes and present your work to them. If you’re just starting out, another way to test the waters is at local arts and crafts shows. This will give you an idea of whether your scopes are marketable, and can also help to determine their market value. Many sellers also choose eBay as a way to sell their goods.

As in the question regarding making kaleidoscopes, the best way is to learn from an artist already skilled in lampworking. There are many variables involved (flame heat, pulling techniques, annealing) and having someone to help you learn the basics is invaluable. Also, there are many books on the market dealing with lampworking.

A “turned” kaleidoscope or object cell is one turned on a wood or machinist’s lathe

A front diopter lens is a magnifying lens used as an eyepiece in a kaleidoscope. Its purpose is to make the image appear sharper, and its required strength is dependent upon the length of the kaleidoscope.

A “kit” kaleidoscope is a package sold which contains all of the materials necessary for creating a kaleidoscope, including the mirrors, eyepiece, exterior panels, etc. These kits are available from Clarity Glass Design (BKS Retailer Member) and Delphi Stained Glass, among others.