Bridge rectifier is designed with four LED’s internally arranged in bridge pattern fitted inside a plastic moulded case. Two LED’s are red and two LED’s are green. This device is used to demonstrate the functioning of a bridge rectifier, i.e., to convert alternating current (AC) into direct current (DC). Two yellow sockets are used for AC input. Two sockets, one red and one black, are used for DC output. For the easy understanding of the internal circuitry, the circuit diagram is printed on the box.

Wood, with six holes to store entomological pins of different sizes, for easy use

All Charts are made on PVC rexine, hand drawn, waterproof, in fast multicolours with a black background. Each chart is provided with rollers to hang on wall. Size 75×100 cm.

1) Animal Kingdom (Classification)
2) Evolution of Man

Three-prong, aluminum extension clamp; prongs covered with rubber tubing. Overall length: 10″. Jaws open to 85 mm. Rod Dia. 8 mm, Rod length 145 mm.

A 5 times enlarged model of the eye, sectioned horizontally, dissects into 7parts, the upper half of the sclerotic membrane, two choroid membranes, retina with vitreous humour, lens and lower half of the sclerotic membrane. On base, with key card.