Approximately 275mm length with cast metal bridge mounted on tripod stand adjustable for height & 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 80x25mm or a metal clip carrying a glass microscope slide 75x25x1.5mm. The tip of the pointer moves over a graduated vertical scale complete with set of weights 1mgm to 1gm.
SURFACE TENSION APPARATUS, JAEGER
Convenient for determination of relative surface tensions, or after calibration with a liquid of known surface tension for determination of that of an unknown. Complete with tap funnel, having ground glass funnel to fit the 500ml filter flask with side arm manometer, 500ml beaker as bath, tube 150x30mm with stirrer & three jets of different sizes. All glass parts made from corning glass.
CAPILLARY TUBES APPARATUS
A 90mm high metal frame having trough of 115x40x10mm. Frame having 6 holes fitted with corks. Trough with capillary tubes of different bore; 150mm in length.
KINETIC THEORY MODEL
The apparatus consists of a clear perspex tube 380mm long & 50mm outer diameter provided with a light, freely sliding expanded polystyrene piston & a loose fitting metal cap. The tube is mounted by means of a bayonet type fitting in a cap, upon a housing 170x170x130mm. A low voltage DC motor is contained in the housing & is coupled to 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 3mm diameter metal spheres & four cardboard loading discs.
For demonstrating Brownian motion. Designed for use with a microscope. A short cylindrical cell, closed by a cover glass, is held vertically in an opaque channel 90x90x30mm. Illumination is by an integral filament bulb & cylindrical glass lens. The cell enables Brownian motion to be observed for at least 15 minutes after charging the cell with smoke. Fitted with 4mm socket terminals for connection with 12V supply.