Consisting of metal strips of copper, brass, aluminium, iron of 100 x 15mm length x width having small cups at outer ends for holding phosphorous and screwed on a wooden ring 125mm outside dia meeting in the centre.

For determining the specific heat of water or similar liquid. It consists of glass tube 100mm long with heating element, electric wire, 2 screw terminals are provided at the ends of the tube for electric supply.

Construction is same as above but having two bulbs with 2 sets of vane, when exposed to sunlight the vanes rotate in opposite directions.