Constructing school science lab equipment

• Cell holder;
• Bulb holder;
• Simple switches;
• Conductivity test[?];
• OHP coil[?];
• Friction blocks[?];
• Hydraulics Demo;
• Angular momentum Apparatus[?];
• Demo periscope;
• Graticule slides;
• Bell jar model lungs;
• Model of The Plough[?];
• Apparatus for demonstrating osmosis;
• Torque Demo[?];