SOAP CYLINDER

. Children Testing the Exhibit
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Grand children are enjoying the exhibit

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This is a exhibit with lot of activity and fun .

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The assembly is fabricated of stainless steel sections or of aluminium to withstand the corrosion.The soap tray is fabricated out of flexible corrugated pipe covered with fibre glass.The PVC ring is filled with weight for making it to drown in the soap solution.The PVC ring is covered with 2 layers of cotton tape to hold the soap solution. This ring guides on 3 nos of 0.8 mm SS

wire. Operating ring moves up and down along SS tubes with brass guides. The operating ring and the soap ring are connected with movable pulley system with advantage of 2. i.e. one downward movement of the operating ring will move two upward movement of the soap ring.

After trials with different combinations of liquids the one with dish washer soap with glycerine and vegetable oil were finalised.

The entire assembly is mounted on a inclined plywood platform covered with linoleum with a collecting tray at the end. Aluminium removable grating is used for safety against slipping on

wet floor. To overcome the wind blowing out the bubble, clear PVC screens are provided on the 3 sides. Two Lights are provided to illuminate the soap cylinder.

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SPLIT MIRROR

Glass mirror strips of 38mm are mounted on clear centre glass. Two protective clear glasses cover the assembly which is mounted in a wooden frame. Visitors enjoy this exhibit.

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INTERACTIVE MIRROR-2

3mm Polycarbonate Mirror is used. A protective vinyl film is applied to the coating side. A glass is mounted on a frame is placed in front to protect the mirror surface from visitors handling.The Mirror is held on one side only and it is bent like a bamboo hand fan. The other end of the mirror slides in a slot. The lever is has two springs so that it always come back to the centre position .
Exhaustive descriptions were added for plain,concave and convex mirrors.

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INTERACTIVE MIRROR

3mm Polycarbonate Mirror is used. A protective vinyl film is applied to the coating side. A glass is mounted on a frame is placed in front to protect the mirror surface from visitors handling.The Mirror is held on one side only and it is bent like a bamboo hand fan. The other end of the mirror slides in a slot. The lever is has two springs so that it always come back to the centre position .

Exhaustive descriptions were added for plain,concave and convex mirrors.

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CRITICAL ANGLE

We have built our own light source using a focus lamp with a cooling fan and lens.

The refractive block is made from clear acrylic.

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DISAPPEARING GLASS RODS

The exhibit calls for oil which matches the refractive index of special glass rods. We have used sunflower vegetable oil and "Borosil" glassrods. We have replaced the glass fabricated tank with glass beakers as the joints started to give away. We have provided dead weight so that the rods go to their "up" position when released.

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PIN HOLE WALL

We have used a metal sheet with pin holes drilled in two positions so that two persons can view at the same time. Frosted plastic sheet is mounted in between clear sheets for the hand held screen. We have used the rear site to exhibit a few optical illusions as a bonus. To give stability for the Exhibit we have made a ballast box. We have also provided castor wheels with locks for easy alignment.

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