This apparatus is for demonstration the volume of air enclosed in the column. Comprises a vertical glass tube of wide bore mounted on side of scale graduated 0-70 cm fitted on wooden base having plastic feet. This glass tube is connected to cylinder metal reservoir by a pressure tubing and stopcock. Reservoir is connected to dual-scale pressure 2 2 gauze reading 0 - 4.2 kg/cm and 0 - 60 lb/in above and side to a riffled inlet with stopcock for connection to foot pump. As the pressure in the oil reservoir increases, colored oil is forced into the glass tube and volume of the contained air and its actual (total) pressure are noticed. Size of base 235 x 145 mm. Overall height of apparatus 855 mm. Supplied without oil.
Optional Accessories: Foot Pump and Burden gauge