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GP-309.1 SURFACE TENSION BALANCE SEARL’S Approximately 275mm length with cast metal bridge mounted on tripod stand adjustable for height and having a levelling knurled head screw fitted on one foot. The bridge has raised end pieces to which are screwed small metal blocks securing either end of a plated steel torsion wire. One block disc slotted to facilitate adjustment for torsion of the wire by means of screw passing through the end piece. At the centre of the wire a small clamp is fitted carrying a light weight metal pointer with an adjustable counterpoise. From a notch near the tip of the pointer is suspended a small weight pan with a hook fitted to its underside, to hold either wire frame 80 x 25mm (L x H) or a metal clip carrying a glass slide. 75 x 25 x 1.5mm (L X H X T). The tip of the pointer moves over a vertical graduated scale complete with set of weights 1mg to 1g.  GP-310.1 SURFACE TENSION APPARATUS, JAEGER Convenient for the determination of relative surface tensions, or after calibrations with a liquid of known surface tension for determination of an unknown. Complete with tap funnel, having ground glass stopper to fit the 500ml filter flask with side arm manometer, 500 ml beaker as bath, tube 150 x30 mm with stirrer and three jets of different sizes. All glass parts made from corning glass.  GP-313.1 CAPILLARY TUBES APPARATUS A 90mm high metal frame having trough of 115 x 40 x 10mm size. Frame having 6 holes fitted with corks, through pass capillary tubes of different bore 150mm in length.  GP-315.1 KINETIC THEORY MODEL The apparatus consists of a clear perspex tube 250mm long x 50mm outside diameter provided with a light, freely sliding expanded polystyrene piston and a loose fitting metal cap. The tube is mounted by means of a bayonet-type fitting in a metal cap, upon a polished wood motor housing 165 x 140 x 75mm high. A low voltage d.c. motor is contained in the housing and is coupled to a crank-driven agitator. The push rod of the agitator carries a light plastic piston which oscillates in the lower end of the tube. The apparatus is supplied complete with a supply of 3mm dia metal spheres and one thermocoal loading discs. Overall dimensions assembled 165 x 140 x 340mm high.  GP-320.1 AIR PUMP Single action pump made of brass with oiled silk valves, cylinder 20cm x 3.2cm dia. Plate 175mm dia, with stopcock, and inlet screw fitted on teakwood polished base. Page : 1 | 2 |