Pendulum bobs (ELP ) spherical, with hook

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Eunice Cole
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Inertia & Gravity Compound Pendulum, Reversible (ELP.104.133) Steel bar, length 1 meter approx. drilled at 5 cm. intervals, with removable knife edges, metal bracket support for wall mounting.

diameter, 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.

1 Inertia & Gravity Compound Pendulum, Reversible (ELP ) Steel bar, length 1 meter approx. drilled at 5 cm. intervals, with removable knife edges, metal bracket support for wall mounting. Compound Pendulum, Kater, Reversible (ELP ) Consisting of nickel plated Brass rod 120 cm long, 10 mm. diameter, 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. Pendulum bobs (ELP ) spherical, with hook.01 Brass 13 mm dia..02 Brass 19 mm dia..03 Brass 25 mm dia..04 Copper 13 mm dia..05 Copper 19 mm dia..06 Copper 25 mm dia..07 Iron 13 mm dia..08 Iron 19 mm dia..09 Iron 25 mm dia..10 Lead 13 mm dia..11 Lead 19 mm dia..12 Lead 25 mm dia..13 Aluminum 13 mm dia..14 Aluminum 19 mm dia..15 Aluminum 25 mm dia. Simple Pendulum Apparatus (ELP ) Excellent for student exploration of the principles of the pendulum and acceleration due to gravity! This apparatus serves two learning purposes as it allows students to study both pendulum and gravity principles. The pendulum consists of two 1" steel balls and one 1" wood ball, each attached to a piece of string; a pendulum clamp which holds them in place; a sturdy wood support and base. Instructions included.

Inertia Balance Kit (ELP.104.137) A class demonstration kit for comparison of masses and to aid understanding of the terms mass and weight.

apart on spring steel strips attached to their sides One tray has holes to take three equal mass cylinders, approximately 100 x 25 mm., length x diamerter.

Split chuck for clamping can be screwed in the middle of the bar or at either end. Length 25 cms. VARIABLE INERTIA BAR (ELP.104.

2 Inertia Balance Kit (ELP ) A class demonstration kit for comparison of masses and to aid understanding of the terms mass and weight. A platform is supported on spring - steel strips which is made to oscillate in the horizontal plane under various loads. Two aluminum tryas `130 x 150 mm., held approximately 200 mm. apart on spring steel strips attached to their sides One tray has holes to take three equal mass cylinders, approximately 100 x 25 mm., length x diamerter. Three support pins to fit radial holes in cylinders. INERTIA BAR (ELP ) Discs at the ends are screwed and can be removed. Split chuck for clamping can be screwed in the middle of the bar or at either end. Length 25 cms. VARIABLE INERTIA BAR (ELP ) To show that the torque required to accelerate a flywheel depends upon its moment of inertia rather than its mass.a steel bar 790x12 mm is mounted at its center on a sleeved spindle. The spindle is extended through a sleeve so that the bar may be rotated by a weight and string. Heavy adjustable masses are mounted on each end of the bar and may be clamped at any desired position enabling inertia to be varied. GYROSCOPE (ELP ) The brass wheel is 7.5 cm in dia 3cm at its rim, carefully balanced and all three pair of pivots are adjustable. Complete fitted on stand. CENTRIPETAL FORCE KIT (ELP ) Comprises 20 each of the following : Glass tube 125 x 8mm length x diameter, rubber 100 x 8mm, length x bore, rubber stopper two hole, plastic rod 25 x 6 mm, length x diameter, wire hook (paper clip), crocodile clip index; 200 metal washers; one ball of cord 30m. CENTRIPETAL FORCE DEMONSTRATOR (ELP ) Used to demonstrate centripetal force, Allows students to see the direction of the force and calculate its magnitude. As the mass is spun around the rotating post, a spring is exerting the centripetal force on the mass, By then measuring the force needed to stretch the spring the same amount, the centripetal force can be measured. Includes: stand, rotating post, rotating arm, counterweight, hanging mass, spring arm, flexible post, and Necessary hardware. Not included: hanging mass set & adjustable tabletop pulley ROTATING PLATFORM (ELP ) Comprising a platform, 310 x 310mm. The large diameter bearing is designed to with stand off centre forces at the same time allowing free rotation. The base is fitted with anti-slip rubber feet. COLLISION IN TWO DIMENSIONAL KIT (ELP ) Curved ramps 260 x 325mm. Length x radius with metal ball track, fitted to base 140 x 90mm length x width, one adjustable ball supports, one clamp to fit slot on base of ramp. One plumb line

assembly and 2 steel ball 12mm dia. COLLISION Ball Apparatus (ELP.104.

146) Comprising a wooden wheel, 150 mm. diameter, the axle having diameters of 75 and 38 mm. A steel rod passes through the centre and has cone bearing.

complete with single pulley block and cord : WITHOUT masses. Wheel & axle, simple form (ELP.104.147) Consisting of a wooden double wheel with flat - bottomed grooves, 150 and 50 mm.

The apparatus is supplied complete with two hooks and 6 m. of whipcord but WITHOUT masses. Wheel & axle, simple form, wall mounting (ELP.104.

This spindle is, however, carried by a pair of cast of aluminium brackets which are mounted on a wooden baseboard 205 x 150 mm. equipped with a pair of hanging plates.

Falling Bodies Apparatus (Projectile Appratus) (ELP.104.149) L-section launcher with holes for locating two 19 mm. diameter steel balls which act as projectiles.

3 assembly and 2 steel ball 12mm dia. COLLISION Ball Apparatus (ELP ) This unit, made by strong steel & consists of five steel balls, demonstrate that for every action there is an equal and opposite reaction. Wheel & axle, compound (ELP ) Comprising a wooden wheel, 150 mm. diameter, the axle having diameters of 75 and 38 mm. A steel rod passes through the centre and has cone bearing. The brackets are of malleable iron with hardened steel adjustale pivots, reducing friction to the minimum. Mounted on a polished baseboard, 450 x 150 mm.complete with single pulley block and cord : WITHOUT masses. Wheel & axle, simple form (ELP ) Consisting of a wooden double wheel with flat - bottomed grooves, 150 and 50 mm. diameter respectively.the wheel is pivoted on a spindle 10 mm. diameter which projects for a distance of 100 mm. so that the Apparatus may be clamped to a normal retort stand. The apparatus is supplied complete with two hooks and 6 m. of whipcord but WITHOUT masses. Wheel & axle, simple form, wall mounting (ELP ) This apparatus is basically similar to SP-150 comprising a wooden double wheel with diameters of 150 and 50 mm. This spindle is, however, carried by a pair of cast of aluminium brackets which are mounted on a wooden baseboard 205 x 150 mm. equipped with a pair of hanging plates. When hung on a wall the maximum projection of the complete apparatus is 195 mm. Supplied complete with two hooks and 6 m of whipcord but WITHOUT masses. Falling Bodies Apparatus (Projectile Appratus) (ELP ) L-section launcher with holes for locating two 19 mm. diameter steel balls which act as projectiles. Launcher is released by pushbutton and projects one ball forward while allowing the other to fall freely. Launching mechanism mounted on wooden block, 180 x 60 x 30 mm., which may be clamped by bench and has convenient store pocket for the balls. Complete with two steel balls. Atwood s machine (ELP ) It has a metal upright 245 cms. high graduated in cms. and having two wall brackets. The pulley is 10 cm. dia and well balanced on frictionless bearings. Platform, sliding weights and over weights are provided. Instead of the usual dropping platform, electric release ( operates on 4-6 Volts) arrangement is provided which allows the weights to start falling instantly the circuit is broken.

Hook s Law Apparatus (ELP.104.151) Consists of a mirror scale 12 cm.

4 Hook s Law Apparatus (ELP ) Consists of a mirror scale 12 cm. long and support, a spring, a weight holder and slotted weights of 250 grams capacity.

Elastic Materials Kit (ELP.104.152) comprises; 2 latex foam blocks, 130 x 50 x 50 mm.

diameter; 2 wide steel springs of 4 1/2 turns, 50 mm. diameter and 25 expendable steel springs for testing beyond the elastic limit, with ends bent to form hooks.

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.

Spirit level mounted in two rectangular cast iron frame with one end resting on point of micrometer screw, fitted in one frame, the second end of spirit level pivoted in the second frame.

The apparatus is black stove - enamel finish in polished wooden case. YOUNG'S MODULUS BY NEWTON RING (ELP.104.155) A glass plate and a lens is fitted to a experimental rod A.

5 Elastic Materials Kit (ELP ) comprises; 2 latex foam blocks, 130 x 50 x 50 mm. square; 4 elastic cords with eyelets; 4 soft rubber erasers, one 900 mm length of rubber tubing; 40 g reels of bare copper wire 0.28 mm. and 0.45 mm. diameter; 2 wide steel springs of 4 1/2 turns, 50 mm. diameter and 25 expendable steel springs for testing beyond the elastic limit, with ends bent to form hooks. Young s Modulus Apparatus Vernier Type (ELP ) For the experimental determination of 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. Young s Modulus of wires apparatus Searle s Pattern (ELP ) Searle s Pattern. Spirit level mounted in two rectangular cast iron frame with one end resting on point of micrometer screw, fitted in one frame, the second end of spirit level pivoted in the second frame. The micrometer is provided with vertical scale 10 mm on either side of the zero and vernier reading 0.01 mm. complete with ceiling bracket having two self centering chucks and tension weight. The apparatus is black stove - enamel finish in polished wooden case. YOUNG'S MODULUS BY NEWTON RING (ELP ) A glass plate and a lens is fitted to a experimental rod A. The Newton Ring lens is adjustable by 3 screws. On applying load at B point, the rod C bends slightly. Experimental rod carries 2 metal plates at different points, increasing the distance between the plate and the lens. Newton's rings are observed before applying the load. As the load is applied gradually the rings run into the centre, disappearing one at a time. A microscope is provided for viewing the rings with cast iron weights set of 500 gms. Without weights. Wire Steel (Bare) (ELP ) For Young s modulus determinations apparatus, swg 22 to 28 ( any guage).

ELASTIC CORD WITH EYELETS (ELP.104.172) For accelerating dynamic trolleys. With a length of elastic cords with brass eye let at each end.

6 ELASTIC CORD WITH EYELETS (ELP ) For accelerating dynamic trolleys. With a length of elastic cords with brass eye let at each end. In use cord is attached with the trolley by slipping one of the eye lets over the front dowel peg. (One or more cords may be used simultaneously depending upon the acceleration required.) Constant acceleration will arise if the cord is stretched a constant amount, say, to length of the trolley. The cords are packed in tens mounted on a card fore easy storage. Dimensions: 150mm unstretched length between eyelets. Force Table Precision (ELP ) To verify the law of composition and resolution of forces. This consists of machined aluminium table 40 cm in diameter. Its raised rim has a engine divided scale, graduated in 360, mounted on heavy vertical support rod and tripod base provided with levelling screws. Body under study is a ring in centre of the table fastened by cords passing over four pulley, attached with the table. Complete with four pulleys, four weights hangers twelve weights (2 x 10 gm, 2 x 20 gm, 4 x 50 gm, 4 x 100 gm) Microbalance Kit (ELP ) Comprises 9 each wood blocks, aluminum support, and screws. with one packet each of 100 elastic bands and 100 drinking straws, one folder of 18 needles and 10 wood strips. Torsion apparatus Horizontal (ELP ) Searle s Pattern, two cast iron feet each with 3 through holes and grub securing screws. Separated by two supporting rods approx. 700 mm long one of with is graduated in cms and mms, while 165 mm dia., over groove, moving in ball bearings, mounted on front foot, with spindle carrying split chuck for holding one end of test rod 55 cms long, 5 cms dia. other end supported with clamping block through rear foot. With Two aluminum scales Graduated in single degree, mounted on pillar supports, which are adjustable along the rod, two pointers along with rod for attaching to the specimen, on each of brass ans steel rod, cork and hook for carrying masses but without weights. Torsion apparatus Vertical (ELP ) It consists of a heavy mild steel frame mounted on a heavy tripod cast iron base. Upper end of the rod 900 mm length and 5 m dia. under test is clamped by a three jaw chuck, and the lower end is clamped, into the axis of the torsion couple three metal circular scales graduated in 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 ends pass over bearing pulleys which ar clamped to the uprights without weights.

Dynamometer RinToul (ELP.104.189) Spring with Zero adjustment, scale 0-500 gm x 100 gm, spring extends 20 mm/ 100 gm, with scale pan dia. 75 mm. Bending Beam Assembly (ELP.104.190) For Determining Young s modulus for the material of the beam when supported at its extremities.

and with electric contacts. But without weights. Flywheel (ELP.104.191) Made of cast iron, machine turned wheel and carefully balanced. Mounted on a horizontal shaft held in ball bearings.

7 Dynamometer RinToul (ELP ) Spring with Zero adjustment, scale gm x 100 gm, spring extends 20 mm/ 100 gm, with scale pan dia. 75 mm. Bending Beam Assembly (ELP ) For Determining Young s modulus for the material of the beam when supported at its extremities. Comprising a metal chrome 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. Flywheel (ELP ) Made of cast iron, machine turned wheel and carefully balanced. 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 also. Dia. (mm)

.01 100.02 150.03 200 Flywheel with Pulley (ELP.104.192) Made of cast iron, machine turned wheel and carefully balanced.

03 200 Second Law of Motion Apparatus (ELP.104.193) This apparatus demonstrates Newton s Second Law of Motion.

It is provided with a detachable rod which enables to clamp the apparatus on a stand or table. Includes 2 steel balls.

Made from an aluminum channel that is clamped to a table top.

However, both balls will land at the same time. SPRING, LARGE, COMPRESSION (ELP.104.195) Approximate 300mm length, 10mm dia, wire gauge 19 s.w.g. SPRING EXTENSION STEEL (ELP.

8 Flywheel with Pulley (ELP ) Made of cast iron, machine turned wheel and carefully balanced. Mounted on a horizontal shaft held in ball bearings. The bracket has four holes and can be fixed to the wall also. Dia. (mm) Second Law of Motion Apparatus (ELP ) This apparatus demonstrates Newton s Second Law of Motion. It consists of a spring-loaded device to show that a ball released vertically will hit the floor at the same time as a ball propelled horizontally. It is provided with a detachable rod which enables to clamp the apparatus on a stand or table. Includes 2 steel balls. SECOND LAW OF MOTION Apparatus Economy (ELP ) Economy Demonstrate the Law of Motion with a device that's kinder to your budget! Made from an aluminum channel that is clamped to a table top. When the unit is pulled back and released, one ball will be projected horizontally and one will drop vertically. However, both balls will land at the same time. SPRING, LARGE, COMPRESSION (ELP ) Approximate 300mm length, 10mm dia, wire gauge 19 s.w.g. SPRING EXTENSION STEEL (ELP ) Of 26 s.w.g wire, closely wound, 6mm dia approx. loops at both ends. Type A B C Length mm Average extn mm SET OF SPRINGS (ELP ) An assortment of 150 compression and extension springs ranging from 11 to 300 mm in length, 3 to 22 mm in dia and 27 s.w.g to 13 s.w.g in wire thickness. In wooden box. SET OF Disproportionate SPRINGS (ELP ) Set of 5 Disproportionate springs illustrating the phenomemon of Elasticity.

Free Fall Apparatus on Stand (ELP.104.199) To demonstrate that objects of different weights fall at the same speed in vacuum.

The unit is mounted on a heavy, cast iron tripod base. The tube can be easily removed from the base if needed. G by free fall apparatus (ELP.104.

Both these units size 13x9x1cm are fitted with 4mm sockets and can be readily clamped on to a 12mm diameter rod.

9 Free Fall Apparatus on Stand (ELP ) To demonstrate that objects of different weights fall at the same speed in vacuum. The unit consists of an acrylic tube, 680 mm long x 38 mm diameter, fitted with a removable plug at one end and the other end has a stopcock for connection to a vacuum pump. The unit is mounted on a heavy, cast iron tripod base. The tube can be easily removed from the base if needed. G by free fall apparatus (ELP ) For determining the value of g by measuring the time taken by a falling steel ball. The apparatus consists of a release unit and a trip unit. Both these units size 13x9x1cm are fitted with 4mm sockets and can be readily clamped on to a 12mm diameter rod. The release unit is fitted with a small solenoid type electromagnet which holds a steel ball. The solenoid helps in the prompt release of the ball on being disconnected. The trip unit has a swinging plate and is fitted with a switch. The switch is normally held closed by a magnet and is opened when the ball falls on the plate. The time of fall is measured by a digital Centisecond Timer. Supplied complete with steel balls but without Centisecond Timer, retort stand and base. Maxwells Vibration Needle (ELP ) For experiment on rigidity. Two solid and two hollow cylinders each 10cm long accurately fitting the bore of a hollow brass tube 40cm long are provided. The tube is also fitted with wire chuck and mirror, graduated scales and Vernier on sliding weights. Complete with ceiling attachment. Hook Law Apparatus Superior (ELP ) For verification of of Hook s law with metal base. Consists of a mirror scale 12 cm. long and supports spring, a weight holder and slotted weights of 250 gms. capacity.

LIST OF PRACTICAL FOR IX-X GRADES

LIST OF PRACTICAL FOR IX-X GRADES Standard experiments 1 To measure the area of cross section by measuring diameter of a solid cylinder with vernier callipers. 2 To measure the volume of a solid cylinder