fitted on wooden base. The apparatus permits two ball to be dropped simultaneously from the same height; while one is allowed to fall straight down & other is pushed hrizontolly by a spring loaded gun, yet both stike the earth at same time.A   stand with two 1” steel balls & a spring gun...

Newton's 3rd law of Motion ( trolley)...

OERSTUD  app..

Pascal Law App Al. Parts..

Periscope..

Periscope  brass sheet..

To demonstrate. Images produced by small apertures .Made of polished wooden box and a glass screen at one end and a hole at the other...

Comprised of a pair of pith balls. 16mm dia suspended by a cotton thread from a wire frame stand. Overall height 110mm approx lift..

Plastic & Aluminium Pulley..

Pump (brass & Glass wooden stand)..

Radiometer Crook's..

Ray BoxThe Ray box is a die cast ventilated lamp housing. It has an open front with extended sides, finned externally to promote heat, dissipation and vertical internal grooves to accommodate a slit plate and a cylindrical lens supplied with complete lamp & triple slit, but without lenses of filters. Used in elementary optics to provide single ..

Reflection of sound app..

A solar panel is mounted on a plastic base , which produces current to glow an LED...

it demonstrates staorage of energy, electrical energy, light energy, sound and electromechanical energy.A large Solar panel is mounted which produces current to charge two 1.5VDC Ni-Cd cells. It has a solar fan, LED  Bulb, a Buzzer & one meter fitted supplied with Ni-Cd cells ,fitted in wooden box(ii)   Same a above but without cells&..