When the paint on the slides is completely dry, insert the slides into the slots in the centering discs. The discs will be ¼” from the edge of the slides. The slides must have the painted surface on the outside of the ‘V’ that is formed when the mirror is assembled. The glass at the apex will fit together tightly along its entire length when properly assembled. See Photo Above
How to Make a Kaleidoscope
By Mary Bellis, About.com Guide
Trace the centering pieces from the pattern on to the cardboard and cut them out with scissors or knife. Cut out the hole in the large ring and the “V” slot in the small discs. Clean any ragged cuts off the edges. Also, cut out the retainer disc from the clear plastic. See Pattern Sheet
The Invention of the Kaleidoscope
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