BLUE SKY

The EXPLORATORIUM has used gelatin for the medium, but it did not work for more than 3 days. We tried various materials like Phenol, Hypo etc but they all lasted for short periods. Finally we used few drops of "Cutting Oil" in water . We top up once in two weeks with a drop of oil.

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GREASE SPOT PHOTOMETER

We have sandwiched the waxed formed ring on grease proof paper which is held between acrylic sheets mounted on an adjustable slide. A timer push switch switches off after some time.

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COLOR SHADOWS

This is a novel exhibit which children like to interact .We have made this exhibit into a table model as it is economical to use standard focus lights with potentiometer to control the intensity of each color to get good shadows. Color Cellophane paper is placed in front of the focus lights to get the color light. A glass top is placed on the lights so that the arrangement can be seen by the visitor.

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