CUBES FOR DENSITY INVESTIGATIONS (METAL)1131
10mm each side in plastic/wooden case.
(a) Aluminium (b) Brass (c) Copper (d) Lead (e) Zinc (f) Iron

CUBES FOR DENSITY INVESTIGATIONS (METAL) 1132
20mm each side in plastic/wooden case.
(a) Aluminium (b) Brass (c) Copper (d) Lead (e) Zinc (f) Iron

CUBES WOODEN 1133
Made of hardwood, accurately cut in different colours.
(a) 1 cm (b) 2 cm (c) 5 cm (d) 10 cm

BLOCK (WOODEN RECTANGULAR) 1134
Made of hardwood.
(a) 5 x 5 x 2.5 cm (b) 10 x 7.5 x 2.5cm (c) 10 x 7.5 x 5cm (d) 10 x 7.5 x 7.5cm

PULLEYS PARALLEL PLASTIC 1135
Polystyrene pulleys of 50mm dia in Aluminium frame with hooks.
(a) Single (b) Double (c) Triple

PULLEYS PARALLEL METAL 1136
Aluminium pulleys of 50mm dia in metal frame.
(a) Single (b) Double (c) Triple

PULLEYS METAL IN LINE 1137
Aluminium pulleys different dia in metal frame arranged in line.
(a) Double 50mm and 40mm dia. (b) Triple 50mm, 40mm & 22mm dia.

PULLEY DIFFERENTIAL 1138
A one piece triple pulley in metal frame with hook.
(a) 38mm (b) 50mm (c) 60mm

PULLEY DIFFERENTIAL 1139
A one piece triple pulley in metal frame with hook. (A) 38mm (B) 50mm (C) 60mm.

LEVER KIT 1140
Supplied as a kit of eight pupils and consists of five plywood beams (600 x 44 x 3mm) graduated every 38mm and with a groove across its centre to locate the fulcrum point. Also included are four fulcrums (32 x 32 x 64mm) and 40 metal blanks 25mm square. The masses of the blanks are matched to ± 1%.

PULLEY ALUMINIUM, CLAMP TYPE 1141
A 50mm dia aluminium pulley mounted in a metal frame designed for clamping to the edge of a bench.
(a) With pulley parallel to the plane of bench. (b) With pulley vertical to the plane of bench

PULLEY, ALUMINIUM, PLAIN BEARING 1142
Comprising a 70 mm diameter pulley with a wide groove for whipcord, mounted in an iron frame, designed for clamping to the edge of a bench with the pulley in a vertical plane. The clamp will accept bench tops of up to 25mm thickness.

YOUNG’S MODULUS APPARATUS 1143
Vernier type. For the experimental determination relationship between a load applied to a wire and the resulting extension. The apparatus consists of an engraved brass scale 10 cm long and vernier reading 0.1 mm. Complete with tension weight but without load masses.

PULLEY BOARD MOUNTING 1144
Aluminium pulley 22mm dia in a metal bracket with mounting plate 40mm long with fixing holes.

PULLEY ON ROD 1145
Aluminium pulley 38mm dia mounted on light alloy rod l0mm dia. 150mm long.

'G' BY FREE FALL APPARATUS 1146
This apparatus consists of a solenoid (for prompt release of the sphere on being disconnected) and gate switch unit mounted on a base, which is clamped on a 12 mm dia. retort stand rod. Connections are made through 4 mm sockets. The gate switch unit consists of a hinged metal plate held against an adjustable contact by means of small permanent magnet so that by proper adjustment, the plate falls promptly at the impact of the falling sphere. Centi-second timer can be used with this apparatus.

PULLEY ALL PURPOSE 1147
An aluminium pulley 50mm dia with groove for cord, mounted in iron frame. The frame is universal type with 2 clamping screws. The pulley can be clamped in any position on bench, rod up to 13 mm dia. Wall or on table etc.

ELASTIC MATERIALS KIT 1148
Containing 25 expendable steel springs, 2 wide steel springs, 114 x 75 mm dia., 2 soft latex foam blocks, reels of copper wire, one of 32 swg & two of 26 swg, each 50 gm, 1 length valve latex tube, 4 elastic cords with eyelets and 4 soft erasers for twisting.

BOURDON GAUGE 1149
A circular gauge having an overall diameter of 100 mm and a depth of 40 mm. The dial reads 0 to 50 Lbs/In 2 x 1 & 0 to 3.5 kg/cm 2 x 0.1 actual (total) pressure and the case has a clear Perspex back so that the working parts could be seen.

PULLEY ALL SYSTEM 1150
Almost every kind of pulley experiment can be demonstrated with the help of this equipment. It is very much interesting and of educational value to students, comprising of wooden polished base of 100 x 20 cm size with two metal supports and a horizontal bar having eight adjustable collars with hooks from which pulleys can be suspended. The following accessories are provided with the unit. Single pulley with hooks 7, Pulley Triple long 2, Pulley Triple parallel 2, Wheel and axle 1, Capstan 1. Slotted weights hanger 50gm 7, 10 gm 3, 20gm 3, 50gm 2, 100gm 7, 200gms 4.

Note: Slotted weights and hangers are made of iron and chrome plated.

WHEEL AND AXLE 1151
Two wheels 150mm dia and 75mm dia made out of solid hard wood with flat bottom grooves. Supplied with a metal axle and a cord.

BENDING OF BEAM ASSEMBLE 1152
For determining young’s modulus for the material of a beam when supported at its extremities. Comprising of a chrome metal plated bar 1 meter long, resting on the knife-edges of 2 heavy table clamps, hanger with knife edge support to rest on the beam with micrometer or spherometer attachment and with electric contacts, but without weights.

PROJECTILE APPARATUS (Free Falling Body Apparatus) 1153
To illustrate that a body impelled horizontally will fall vertically at the same rate as a similar body allowed to fall freely. Comprises spring loaded L Section launcher with holes tor locating two 19mm dia steel ball which act as projectiles. Launcher is released by push button and projects one ball forwarded and allowing the other to fall freely. Mounted on wooden block, 180x60x30 mm which may be clamped to bench and has convenient storage pocket for the balls. Complete with 2 steel balls.

DYNAMIC TROLLEYS 1154
300mm long, metal reinforced at ends having three low friction ball bearing wheels filled with spring loaded impulse rod having three elastic positions to provide different impulses. The rod is triggered by a release pin.

DYNAMIC TROLLEYS 1155
Improved model, similar to HARRIS. Made of single pcs. wooden block with three rubber wheels mounted with steel balls for min. friction plunger made of S.S. pipe with Nylon cork at the front.

BALANCE LEVER 1156
A direct reading, single pan balance with its scale in the form of a quadrant. The arc scale is graduated in dual ranges of 0-250 x 1gm and 0-1000 x 5gm which can be set using the weight arm provided. Cast aluminum frame with all steel parts chrome plated. Leveling screw for zero adjustment.

TICKER TAPE TIMER 1157
It comprises an electromagnet with spring loaded armature. Guides for paper tape are provided. Dotting screw working on electromagnet marks the paper tape running under a carbon disc. Supplied with paper roll. AC or DC.

TICKER TAPE TIMER (AC 50-60 Hz) 1158
An improved rugged model providing fixed frequency of 50 dots per second, operating on 5-12 volts AC. Design is such that there are no parts to adjust loose or to wear out. Base is heavy metal with rubber feet so that clamping is not necessary. The tape platform is adjustable so that number of tracks may be made on one tape and carbon disc is efficiently used. Input by 4mm socket terminals. Dimensions :175 x 550 x 55mm approx. Weight : 550 gm approx.

SPRING EXTENSIONS STEEL 1159
Used for demonstrating Hook’s Law

ROTATING PLATFORM 1160
Comprising a platform 310 x 310mm on which a student may stand in angular momentum experiments. The large diameter bearing is specially designed to withstand off centre forces at the same time allowing free rotation. The base is fitted with anti-slip rubber sheet.

COLLISION IN TWO DIMENSIONAL KIT 1161
A curved ramps 260x325 mm length x radius with metal ball track, fitted to base 140 x 90 mm length x width, one adjustable ball supports, one clamp to fit slot on base of ramp. One plumb line assembly and 2 steel ball 12 mm dia.

INCLINED PLANE, SIMPLE 1163
Hardwood. comprising cutaway base to allow cord to hang freely and hinged plane 600x75x8 mm with aluminium pulley, 28mm diameter, and stepped lower face to accommodate wood block for setting at angles between approximately 24º and 45º. With cylindrical metal roller and pan.

PENDULUMS OF STAND 1162
Three 2.5cm Pendulum bobs of wood, iron and steel are suspended from a common hanger mounted on a vertical rod screwed to a heavy metal stand. A meter scale and a sliding index can control the length of the first cord. Zero of meter stick is placed at the bottom and when the center of the pendulum is placed opposite this point, the length of the pendulum is read directly from the position of the slider.

INCLINED PLANE 1164
For experiments on sliding friction comprises inclined wood board 600 x 100 x 20mm with 22mm dia metal pulley, hinged to wooden base 450 x 100 x 20mm linear scale fixed to the edge of plane and vertical linear and 0-45 angular scale fixed to the base, with clamp shaped for use as an index. Supplied with one each wooden block 200 x 75mm and 100 x 75mm. Metal block 100 x 75mm, scale pan 75mm dia, cord and hooks.

FRICTION KIT 1165
To provide a simple demonstration of the relationship between friction and reaction. Kit comprises warp-free wood board, 760x150x20 mm thick, with steel eye ring in one end edge, 10 stainless steel rollers 190mm long x 13mm diameter, 4 wood blocks 230x115x20mm thick, one of which has a steel eye in one edge, and a stout metal crank handle in a U shaped bracket, 90x50 mm, to tow board on rollers. Without spring balance. ACCESSORY : Spring balance 1 Kg.

COMPOUND PENDULUM (KATER’S) REVERSIBLE 1166
Consisting of nickel-plated metal rod 120 cm long, 10 mm dia. with one pair each of small and large adjustable brass and wooden masses, two steel knife edges set in adjustable metal holders and metal bracket support for wall mounting.

LEVER SIMPLE FORM 1167
For introducing the concept of equilibrium leading to an appreciation of the principle of beam balance. Consisting of a polished boxwood rule 1meter in length, divided in centimeters and millimeters on one edge, and inches and tenths on the other. Drilled every 2 cm. Without riders. Riders only for above lever, set of three: one acts as a fulcrum and the other two as weight hangers. Complete with hanger hooks.

INERTIA BALANCE 1168
Comprises two metal trays 130 x 55 x 23mm joined together with a pair of spring steel strips 10mm wide the distance between the two trays being 215mm. One tray is drilled to hold three equal cylindrical masses. The other tray acts as anchorage and can be clamped to the bench horizontally or vertically. Complete with three masses and a ‘G’ clamp for mounting. Overall dimensions 325 x 130 x 23mm.

CAPILLARY TUBE APPARATUS 1169
For demonstrating the relationship between capillary pressure and the bore diameter of the capillary tube. The apparatus comprises a metal frame, the base of which takes the form of a trough 115 x 40 x 10 mm. The upper part of the frame supports six capillary tubes, each of a different bore, their lower ends resting in the bottom trough. The trough is fitted with water and the difference in heights of the resulting columns of water in the tubes is readily apparent. Overall height of frame 90 mm, length of capillary tubes 150 mm.

BUCKET AND CYLINDER 1170
Brass nickel plated, 60mm long 20mm dia. Overall extended length 160mm.

SIMPLE PENDULUM BOBS STEEL/LEAD/BRASS 1171
Solid spheres with a hook for suspension available in three sizes. Diameter:
a) 13mm
b) 18mm
c) 25mm
Also available COMPOUND Pendulum and KATER Pendulum.

HYDROMETER NICHOLSON 1172
Hollow brass body nickel plated 250 x 35mm dia with upper loading pan and lower loaded weight cone.

HYDROMETER UNIVERSAL 1173
A direct reading relative density hydrometer streamlined form with parallel graduated stem and shot loaded bulb, all glass. Range : 0.700 to 2.000 x 0.010 at 60ºF. Overall length 370mm approx.

SMOKE CELL 1174
For the observation of ‘Brownian Motion’ in smoke particles. Consists of a box with plastic lid as well as flanges that allow easy attachment to standard microscopes. The box contains a smoke cell, cylindrical condensing lens and a 12V 3W festoon bulb. Apparatus preset to focus the light at correct height. The set is supplied complete with detailed instructions and a squeeze bottle type smoke generator. Dimensions 90 x 46 x 20mm.

DISPLACEMENT VESSEL 1175-A
Metal, large size, with overflow outlet for specific gravity experiments.

DISPLACEMENT VESSEL 1175-B
Glass, medium size, with overflow outlet for specific gravity experiments.

EQUALITY OF PRESSURE IN LIQUIDS (Pascal Law Apparatus) 1177
To demonstrate the equal transmission by liquids of pressure in all directions. Comprising glass flask with holes and glass piston.

BATTERY HYDROMETER 1178
Glass hydrometer range 1100-1300 with coloured zones blue, white and red for charged, partly charged and uncharged conditions provided with compressible rubber bulb and rubber tube fitting to the body.

BERNOULLI’S TUBES 1179
To demonstrate the Bernoulli effect produced by water-flow. Comprises a Bernoulli tube, with central constriction, a constant-bore gradient tube, 6 lengths glass tubing, 2 swan-necked outlet tubes and 8 pre-cut lengths of rubber connecting tubing. The 2 flow-tubes, each 500 x 13 mm. Length 25 mm x 150 mm spacing, extended to form 500mm. Manometers with the lengths of glass tubing.

BOYLE’S LAW APPARATUS 1180
Simple type consists of a 50ml polythene syringe held firmly in a strong and stable base, and another flat piece is attached to the syringe piston. When the weights are placed on it causes compression of air. Air bleed valve provided. Dimensions: l00x100x180 mm height.

BOYLE’S LAW APPARATUS 1181
Designed for precise readings over a wide range of pressure. The flexible tube has a funnel at one end and connects to a glass tube that has a stop cock, a meter stick is mounted between the two tubes. The apparatus has a sturdy aluminum frame with metal base. Mercury not include; order separately.

BOYLE’S LAW APPARATUS (High Precision) 1182
A wide bore glass tube is mounted vertically in front of a scale graduated 0 to 60 cm. Zero corresponds to the inside of the closed (top) end of the tube. Air is confined in the tube by a coloured oil contained in a metal pressure chamber which is fitted with a Bourdon-type gauge calibrated 0 to 50 Lbs/In2 & 3.5 Kg/cm2 actual pressure. A valve is fitted to the air inlet tube from the pump. As the pressure in the oil chamber is increased oil is its actual (total) pressure are directly indicated. The tube is of extra strong glass and plastic safety screen is secured and fitted on front. Overall height of apparatus 690mm approx.

KINETIC THEORY MODEL 1183
To understand and study motion and behavior of molecules in gases. An electric motor, running at 4 to 12V D.C. vibrates a small platform inside a transparent tube so that a set of many small stainless steel ball is vibrated violently inside the tube. An increase in the violence of vibration simulates an increase in gas temperature and an increase in the weight of the 'float' simulates an increase in gas pressure. Supplied with balls and 2 'floats'.

HARE’S APPARATUS 1184
A three limbed glass tube mounted on polished wooden stand with scale in cm & mm column height adjustable by means of sliding stand. Complete with rubber tube and pinch cock.

BRAMAH HYDRAULIC PRESS 1185
All glass working model with visible coloured valves, overall height x width 225 x 120mm, mounted on wooden stand with plastic trough.

LIFT PUMP/WATER PUMP 1186
All glass working model. Overall height approx. 350mm mounted on wooden stand with metal trough.

FORCE PUMP 1187
All glass working model overall height approx 350mm. Mounted on wooden stand with metal trough.

SPOUTING CYLINDER 1188
To demonstrate that pressure increase with depth. Made of metal sheet 48 x 10cm ht x dia with three orifices of same diameter with rubber cork and glass tube in each orifice.

COMMUNICATING VESSEL 1189
Made of glass with four limbs of different types and shapes vertically above a horizontal communicating tube mounted on a Bakelite stand.

DEMONSTRATION ANEROID BAROMETER 1190
100m dia dial with movement encased in a transparent acrylic case gives full inside view of instrument. Allows action to be demonstrated when pressure is applied with the help of a rubber bellow. Same as Cat. No. 3170 (Meteorology Section)

MAGDEBURG HEMISPHERES 1191
For demonstration of the pressure exerted by the atmosphere. Made of chromium plated brass with stop cock and rubber gasket. Diameter 75mm. Also available in aluminium.

MAGDEBURG HEMISPHERES ON (on Stand)1192
To demonstrate the pressure exerted by the atmosphere. Two brass alloy hemispheres of outer diameter 110mm (approximately) at the Flange. When in use, the hemispheres are placed together and the enclosed air evacuated. Hemispheres are fitted on a suitable cast iron Base. Connection to a suitable vacuum pump is made via the stop cock tube on the base.

AIR PUMP (HAND VACUUM PUMP) 1193
Single action pump made of Al/Brass with oiled silk valve, cylinder 20 x 3.2cm dia, connected to a metal plate through a stopcock fitted on a wooden polished base.
Plate Dia. : 150mm, 200mm, 250mm

HYDRAULIC PRESS 1194
Comprising two heavy-walled glass cylinders 40mm and 15mm i.d. respectively, both fitted with non-return valves and synthetic material pistons; pump worked by hand lever 315mm long, ratio about 2:1, safety valve provided in the larger piston so that pressure in excess of that which can safely be applied to the glass cylinder enables the water to rise above the piston and escape through the overflow pipe at the top; stopcock at base of small cylinder for replenishing cylinders with water by rubber tubing from beaker of water. Removable loading platform, wedges for breaking metal bars. Strongly constructed and mounted on baseboard 290x190mm. The above list does not include the entire range of instruments available, please feel free to request other items throughout this field.

FORCE TABLE 1195
To verify the law of composition and resolution of forces. This consists of machined aluminum table 40cm in dia. Its raised rim has a engine divided scale, graduated in 360º, mounted on heavy vertical rod and tripod based with leveling screws. Body under study is a ring in center of the table fastened by cords passing over four pulleys, attached with the table. Complete with four pulleys, four wts hangers twelve wts (2 x 10 gm, 2x20gm, 4x50gm, 4x100gm). Also available Vector Force Table or Apparatus.

FORCE BOARD (Parallelogram of forces)1196
This kit is very useful for teaching basic principles of mechanics. A number of assemblies can be built with this equipment to demonstrate and perform a number of experiments in dynamics, statics and general properties of matter. A compact self supporting frame acts as a basic support for th different assemblies and the whole apparatus can be assembled and disassembled quickly and easily.

SOLID MATERIAL KIT 1197
Consists of two each of the seventeen blocks in following sizes:
50 x 40 x 30 mm - softwood, hardwood, paraffin wax, aluminium, iron & Polystyrene
20 x 20 x 100 mm - Perspex, glass, slate, aluminium, softwood, marble
lead 50 x 50 x 20 mm, aluminium 50 x 50 x 80 mm, hardwood 50 x 50 x 200 mm, brass 20 x 20 x 50 mm, iron 40 x 40 x 20 mm.

MECHANICAL TRAINING MODULES 1198
Highly useful for demonstrating the most fundamental and frequently used mechanism. Very useful for Engineering students. All the components are made of high degree of precision. Also the process can afford an hour of creative joy to the amateur or professional student. These modules are assembled on transparent perspex sheets to facilitate teaching. Easy to assemble or disassemble.

Single stage-Spur Gear. 1198/1
Single stage-Spur Gear with intermediate Gear. 1198/2
Two Stage-Spur Gear. 1198/3
Three Stage-Spur Gear. 1198/4
Three Speed and Reverse Gear. 1198/5
Worm Gear.1198/6
Bevel Gear. 1198/7
Rack and Quadrant Gear Drive. 1198/8
Reversing Gear (Tumbler Type). 1198/9
Epicyclic Gear (Sun and Planet). 1198/10
Cycloidal Motion. 1198/11
Internal rolling Gear drive. 1198/12
Internal Gear and Pinion drive. 1198/13
Helical Gear. 1198/14
Spiral Gear 90 degree. 1198/15
Spiral-Gear single stage with intermediate Gear. 1198/16
Herringbone Gear. 1198/17
Crank drive to oscillating link. 1198/18
Crankshaft and Slider Mechanism.1198/19
Two crank and linkage drive(Variable velocity). 1198/20
Crank and Slotted link drive.(Oscillator). 1198/21
Crank and slotted link drive.(Variable velocity). 1198/22
Friction wheel drive.(Circumference). 1198/23
Centrifugal Mechanism and clutch drive. 1198/24
Friction wheel drive (Variable speed). 1198/25
Cone clutch drive (Single sided) 1198/26
Cone clutch drive. (Two speed). 1198/27
Dog clutch drive.(Single sided) 1198/28
Dog clutch drive.(Two speed). 1198/29
Flat belt Drive (with tensioner). 1198/30
Belt Drive Toothed. 1198-31
Belt drive-single speed. 1198/32
Belt drive - Two stage. 1198/33
Belt drive (Contra-Rotation). 1198/34
Belt drive-multi speed. 1198/35
Chain Drive (with Tensioner). 1198/36
Geneva Drive (Maltese Cross). 1198/37
Sliding wedge gear with straight line and accurate output. 1198/38
Cam with straight line and lever followers. 1198/39
Face Cam Drive. (Free follower). 1198/40
Face Cam Drive. (Double sided). 1198/41
Oldhams Coupling. 1198/42
Differential Gear. 1198/43
Lathe Screw Cutting. 1198/44
Shaper. 1198/45
Crank and Connecting rod. 1198/46
Four bar link mechanism.1198/47
Scotch Yoke Mechanism.1198/48
Ellipse Tracer.1198/49
Watt Mechanism.1198/50
Peaucellier Linkage drive.1198/51
Pantograph Mechanism.1198/52
Allen Link Motion. 1198/53
Hobbing. 1198/54

FLUID PRESSURE APPARATUS 1200
Comprises of two brass cylinders of different diameter fitted with pistons and connected by a brass tube. Mounted on polished wooden base.

MANOMETER, GLASS 1200_1
Glass manometer with built-in stopcock mounted on a back plate. Scale 80-0-80 with 2 mm subdivisions. Back plate dimensions 40 x 8 cm.

PUMP PLATE 1200_2
Made of aluminum metal, with tube for connection to pump and the stopcock for air regulation on central pillar. Mounted on heavy tripod base, finished in black colour. Diameter of Pump Plate (A) 175,( B) 200, (C) 250.

GUINEA AND FEATHER APPARATUS 1200_3
Un-evacuated glass tube 50 cm long, 16 mm dia. Made from hard glass, with two rubber bungs, one carrying brass and 40 cm long pressure rubber tubing to connect to a vacuum pump.

PASCAL'S APPARATUS (Weinhold) 1200_4
To show that the pressure of liquids varies with depth and not the shape of the vessel of 4 different shapes mounted in leak proof metallic collars mounted on wooden base.

SPOUTING CYLINDER 1200_5
For demonstrating the principle that the pressure increased with depth. Made of stout tin sheet having three orifices of the same size but at different heights down one side. Size of cylinder 400 x 68 mm (height x dia.)

TORSION APPARATUS (VERTICLE) 1200_6
It consists of a heavy mild steel frame mounted on a heavy trileg cast iron base. Upper end of the rod 900 mm length and 5 mm dia under test is clamped by a 3-jaw chuck and the lower end is clamped, into the axis of a torsion couple three metal circular scales graduated in single degrees which are free to slide on one of the graduated rod can be clamped at any position. Three pointers for clamping to the test rod are provided. Strings to apply the deflecting couple and having pans at their free and pass over bearing pulleys which are clamped to the uprights without weights.

TORSION APPARATUS (HORIZONTAL) 1200_7
Searle?s pattern, two cast iron feet each with 3 through holes and grub securing screws, separated by 2 supporting rods approx. 700 mm long, one of which is graduated in cm and mms, wheel 165 mm dia, over groove, moving in ball bearings, mounted on front foot, with spindle carrying split collet chuck for holding one end of test rod 55 cm long, 5 mm dia, other end supported with clamping block through rear foot. With two Aluminium scales graduated 30-0-30 in single degrees, mounted on pillar supports, which are adjustable along the rod, two pointers with clamp for attaching to specimen, one each of brass and Steel rods, cord and hook for carrying masses but without weights. Also available TORSION APPARATUS (VERTICLE).

SURFACE TENSION BALANCE SEARL'S 1200_8
Approximately 275 mm 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 80 x 25 mm or a metal clip carrying a glass microscope slide 75 x 25 x 1.5 mm. The tip of the pointer moves over a graduated vertical scale complete with set of weights 1 mgm to 1 gm. Also available SURFACE TENSION APPARATUS (JAEGER).

HOOK'S LAW APPARATUS 1200_9
Consists of a mirror scale 12 cm long and support, a spring, a weight holder and slotted weights of 250 gm capacity.

'G' BY FREE FALL APPARATUS 1200_10
This apparatus consists of a solenoid (for prompt release of the sphere on being disconnected) and gate switch unit mounted on a base, which is clamped on a 12 mm dia. retort stand rod. Connections are made through 4 mm sockets. The gate switch unit consists of a hinged metal plate held against an adjustable contact by means of small permanent magnet so that by proper adjustment, the plate falls promptly at the impact of the falling sphere. Centisecond timer can be used with this apparatus.

LINEAR AIR TRACK 1200_11
Angular section aluminum alloy track, length 255 cm, with staggered air holes, supported on two light alloy castings positioned 45 cm from each end of the track. One support has a two-point contact and other one-point contact for lateral and horizontal adjustments for which a knurled screw is provided. Large catapult arms with slots for elastic bands are fitted to each end of the track. A pulley fitted to one end of the track enables experiments involving acceleration under a constant force to be investigated. Identical end caps enable air to be introduced from either end of the track, bung being supplied to close the end not being used. The vehicles buffer attachments and clamping screws are matt black to help interpretation of stroboscopic photographs.

FLETCHER’S TROLLEY 1200_12
Used for demonstrating relation between space, velocity acceleration and mass. An aluminum track, 1720 x 150 mm wide with leveling screws. Aluminium pulley 50 mm dia., clamp for vibrator and automatic pen release. Aluminium trolley 690 x 80 x 65 mm, with three wheels mounted on ball bearings, five holes to accommodate cylindrical masses each approx. 350 gm. Vibrator 600 mm long with clamping marks at 5 and 8 Hz and pen holder with one each wood blocks 150 x 75 x 13 mm, 150 x 75 x 50 mm. Without pen and paper.

FLY WHEEL 1200_13
About 20 cm in dia. by 44 mm wide turned and carefully balance, mounted on a horizontal shaft held in ball bearings. The wheel is marked and pointer is fixed to the bracket. The bracket has four holes and can be fixed to the wall as well.

ATWOOD MACHINE 1200_14
This machine has brass pipe upright 240cms (8 ft.) long graduated incms. Metal fittings and arrangement for exact adjustment, vertical and horizontal. No dropping platform. Electric release weights start falling instantly circuit is broken. Wheel of aluminium 10cms. Diameter is carefully adjusted and balanced on steel agate bearing; platform with sliding weights and over weights.

JOLLY AIR THERMOMETER BULB 1200_15
A glass bulb of 50mm diameter is designed to be attached to three sides of thermometer which is mounted on a wooden frame.

RINTOUL DYNAMOMETER 1200_16
A Spring with zero adjustment mounted on a scale of 0-500 g x 100 g, spring extends 20 mm / 100 g. Supplied with scale pan diameter 75 mm.

CARTESIAN DIVER 1200_17
To demonstrate floating, suspension, & sinking in accordance with Archimedes’s principle. Made of glass & approx. 35 mm long.

VACUUM GAUGE (Manometer) Bennert 1200_18
To be used as differential manometer, pressure gauge & vacuum gauge; closed tube fitted with mercury with stop cock & sliding mirror scale graduated 200 - 0 - 200 x 2 mm on wooden stand.

MAXWELL’S VIBRATION NEEDLE 1200_19
All brass N.P. For experiments on rigidity. It consists of a hollow brass tube graduated with scale divided in mms and with vernier to read 0.05mm. 40 cms. Long, 18 mm dia fitted with a small chuck and carrying a mirror, 2 solid cylinders and 2 hollow cylinders all 10 cms long accurately fitted in the bore of the tube and ceiling attachment with chuck.

SURFACE TENSION APPARATUS (JAEGER) 1200_20
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 500 ml filter flask with side arm manometer, 500 ml beaker as bath, tube 150 x 30 mm with stirrer & three jets of different sizes. All glass parts made from corning glass.