How to make a constellarium
A constellarium is a simple device used in teaching the shapes of several constellations. Get a cardboard or wood box and remove one end. Draw the shapes of various constellations on pieces of dark coloured card- board large sufficient to cover the end of the box. Punch holes on the diagrams where the stars are located in the constellations. Place an electric lamp inside the box. When the lamp is turned on and several cards are placed over the end of the box, the constellations may be seen clearly.