Starlac Industries

Mahesh Nagar, Ambala, Haryana

Searles horizontal pattern. Two cast iron feet each with three through holes and grub securing screws separated by two rods approx. 700 mm long. one of which is graduated, Wheel 165 mm diameter, over groove, moving in ball bearings, mounted on rear foot, with spindle carrying split collet chuck for holding one end of test rod, other end supported with clamping block through ot foot. With two aluminium scales graduated 30-0-30 degrees mounted on pillar supports, two pointers with clamps attaching to specimen, one each brass and steel rods 5r diameter, cord and hook for carrying masses, but without masses.

To determine the standing longitudinal waves in column of air and velocity of sound in air. It comprises a glass tube approx 1.2 mtr. length and 34 mm diameter. There is a tightly fitting but adjustable piston on a 390 mm long rod at one end of the glass tube. A loose fitting piston attached to a 1.2 mtr. long sounding rod at the other end of the glass tube. Fitted on a wooden base board.

To determine refractive index of a liquid by measuring the critical angle. It comprises a bridge 150 x 100 x 75 mm, air cell 40 x 30 mm held by detachable spring clips, (air cell consists of two glass plates held parallel at small distance apart in a frame). Air cell holder is attached to a knob carrying pointer with scale graduated 0-360. Supplied without tank.

comprising a wooden resonance box of 114cm length, 12.5cm width and 10cm height, with two rules 1 mt. long sub-divided into millimeters. One each brass and steel wire of different dia. attached to fixed bridge and tensioned by line adjustments pegs, two moveable bridges, pulley and fixed screw to enable a third we to be fixed for tensioning by masses. One each additional wire of steel and brass, each 1.5m length and of 22swg.

Consists of a graduated meter rule with fulcurm, figured 50-0-50cm balanced and fitted into a grooved wooden stand with hangers supplied without weights.

Study the magnetic field around a wire. Consists of a heavy copper wire arranged so that iron fillings can show the direction of the field around the vertical portion of the wire. A compass can be placed under the horizontal portion of the wire for showing the same effect. By sending current through the wire and noting the directions in which the needle points, one can trace the lines of force around the wire and also determine the direction of the current.

This apparatus demonstrates the independence of horizontal and vertical velocities. It comprises a polished wooden block 200 mm long, which is pivoted an L-section metal launching bar 180 mm long. The bar is spring loaded and provided with a trigger catch. A small hole near each end of the bar serves to locate a 18 mm diameter steel ball. As and when the catch is released one ball drops vertically while the other is projected horizontally. The fact that the vertical velocities of both balls are the same at any instant, despite the fact that one has a large horizontal component, is shown by the fact that both hit the floor at the same instant.

To demonstrate the transmissibility of fluid pressure. The apparatus comprises two metal cylinders 15 mm and 30 mm dia respectively fitted with piston and connected by a tube. The pistons are provided with rods terminating in plate forms for loading with masses required. The complete apparatus is fitted on a wooden base.

To demonstrate the forces exerted during thermal expansion or contraction. It comprises of a heavy cast iron frame with slotted end pillars to carry a stout iron bar. The bar is threaded at one end for large tensioning nut and has holes at the other end to accommodate the cast iron breaking bars. Supplied complete with 10 breaking bars.

To explain the effect of flow of current in conductor on the magnetic needle. Consist of a rectangular section of copper wire of dia. 6mm, mounted on an insulating base over a post on the axis of which a 75mm magnetic needle is mounted. When current flows in the conductor, needles moves around depending on the direction of flow of current.

Two pieces of glass, one ground flat and the other with a slightly convex surface, are clamped together within two plastic/metal rings. Varying tension on the rings produces interference rings. Demonstrates the precision attained in grinding flat glass surfaces. Aperture 30 mm, outer dia 60 mm.

For demonstration of wave motion, pulses, reflection and interference, steel wire close wound helix, 19 mm diameter closed length 3 mtrs. extending to approximately 9 mtrs.

For demonstrating both longitudinal and transverse motions, comprising a number of eccentric discs supporting a series of metal rods. Transverse waves are obtained on revolving the handle, longitudinal waves obtained with bent rods running in a metal guide and fitted on polished wooden base.

To verify the relationship between forces action at a point. Comprises board 65 x 50cm, with two aluminium pulleys, 50mm dia, on clamp, for mounting in any position. Complete with three hangers iron nickel-plated 50gm and 12 slotted weights of 50gm each, supplied with reel of cotton thread and a ring.

It comprises of two cast iron uprights vertical pillars height approx 180 mm linked by rods, supporting an expansion bar, length 380 mm, fixed to one upright and resting on a friction pointer at the other with scale, supplied with one each aluminium; iron and brass expansion bars.

It comprises of a wooden box with square apertures at the top, their areas being in the ratio 4:1. There is a flexible plastic membrane immediately under the top of the box. On this membrane, loose loading platforms are supported when fitted into the apertures. A gentle pressurisation of the box with a foot pump demonstrates the relationship between area and the masses. The box is provided with tubules one at each end. Supplied without loading masses and foot pump. Dimensions 400 x 750 x 25 mm, loading platforms, (a) small: 100 mm square and (b) large: 200 mm square.

A glass U tube, 15 mm dia, with one limb plain 220 mm long and other limb graduated 25 to 35 x 0.2 ml, 120 mm long terminating in a bulb 38 mm diameter, with third limb 185 x 6 mm (L x D) joined at right angles to the plane of the other two, short length of glass tubing mounted in end of wide bore plain limb with rubber bung, a piece of rubber tube and a pinch clip. Supplied with tall form beaker 1000 ml and stirrer. 30 ml mercury is required. Supplied without mercury and without thermometer.

This apparatus is used to measure surface tension by Capillary rise in a small bore. It comprises six glass capillary tubes 125 mm long, ends ground flat, of different bores, supported by a metal frame in a shallow metal trough.

It comprises two tuning forks each of frequency 426 Hz on two separate resonance boxes. One fork is fitted with adjustable loading mass. When both forks are sounded together, a clearly audible beat is produced. Rate of beats depends on difference in frequencies. This difference can be increased by changing the loading mass.

Wood board with matt white surfaces, mounted on plastic feet carries a circular scale with 0-360, four quadrants 0- 90 graduated every 2 , removable turntable 170mm dia with 2 lines at right angles and a Ray Box with a 12V, 24W bulb. Supplied with a cylindrical convex lens of focal length 75mm and two double screens, giving one wide slit and one each single, three and five slits.

For determining the maximum density of water. Sheet iron cylinder 200 x 50 mm (ht x diameter) mounted on a base and encircled midway along its length by a gallery 60 x 100 mm (ht x diameter). Fitted with tabulators but without suitable rubber stoppers.

For demonstrating the principle of the parallelogram law of forces and polygon of forces. A unit is a drawing board size : 75 x 60cm fitted on two side pillars for standing. The board is supplied complete with two pulleys (clamp pattern) 3 x 50gm hangers and 12 slotted weight of 50gm, reel of cotton thread and a ring,

To demonstrate the production of a magnetic field by a current flowing in a solenoid. It consists of 3 coils of 5, 10, 20 turns, of insulated copper wire, suitably supported at the centre of the wooden base, having 4 socket terminals.

Consists of 5 metal rods of different materials having equal lengths mounted in sheet metal box 150 x 90 x 100mm with corks. Rods are coated in paraffin wax when used and the rate of melting is compared by hot water put into the box.

Two grooved wheels of hardwood, dia i50 and 50 mm respectively making a double wheel pivoted on a spindle 10 mm diameter which projects for 100 mm distance. Apparatus can be clamped on retort stand. Supplied complete with two hooks and 6m whip cord but without masses and without retort stand.

To show that pressure of liquids depends upon their height of the columns and not on the capacities of the vessels. With four vessels of different shapes. A pillar with rod is mounted vertically on a wooden base. The four vessels of different shapes with screw fittings supplied, can be attached on a support (one at a time) which is open from the bottom. Below this a lever is provided, on , one end of which weights can be added and on the other end a disc, on which the liquid in the vessels exerts the pressure. A pointer indicates the level of liquid.

Simple form, to demonstrate the inertia of a body at rest. A sheet of cardboard may be removed from beneath a steel ball, without displacing the ball from its original position.

A class kit of different wires or rods each 250mm long for comparing the^hermal conductivities of different materials.

To determine thermal conductivity of bad conductors in form of thin layers. It comprises of cylindrical slab of brass 87 cm x 12 mm (Dia x thickness), resting on it is a 5 cm deep hollow cylinder of the same diameter with inlet and outlet tubes for steam; both having radial holes, for the thermometers. Material under test is placed in between two cylinders. Apparatus suspended by strings attached to the lower cylinder from Iron ring 125 mm diameter on retort stand with rectangular base 220 x 140 mm and rod 600 mm long. Complete with one each disc, specimens of glass, plastic annulus 3mm thick for determining conductivity of liquids.

Spare Parts Thermal Conductivity specimens, one each plastic and glass discs, one plastic annulus for liquid specimens.

AccessoriesThermometer Mercury-5 to 105Cx0.5C 2 Nos.

This apparatus is used to compare the densities of liquids, comprises of three limbed glass tube side limbs 45 cms long I rubber tubing on the centre limb closed by mohr clip. Mounted on wooden stand with a 45 cm long scale on both limbs with zero at bottom. The densities of liquid are compared by measuring heights of the two columns of the liquid by applying suction to centre limb.

This apparatus in conjunction with whirling table is used to demonstrate the effect of centrifugal force.

Used for the study of induced currents, comprises of two solenoids with one smaller of dia to fit in the bigger one. The resistance of the first solenoid is O.Sohms wound on former 110 x 30 (Ixd) and second having resistance of 120 ohms (Approx.) on former 110 x 82mm (Ixd). Both the solenoids are prepared with enameled copper wire and two 4mm socket terminals are mounted on each. Supplied complete with one soft iron core, wnrks on 6-12 VAC/DC.

To demonstrate thermal conductivities of different metals. A cylindrical metal container approx 100 x 90mm (H x D) with five rods 230 x 3mm dia of copper, aluminium, brass, mild steel and stainless steel. Each rod has captive slider which releases from a spot of wax when heat travels along the rod.

The apparatus enables electric field patterns to be shown in much the same way that magnetic fields are demonstrated with iron fillings, either by direct viewing or on an overhead projector. The apparatus comprises a clear plastic dish 90 x 12mm dia x depth and base 140 x 125mm, which carries a pair of 4mm socket terminals/electrode holders. Alongside each terminals is a thumbscrew system, which permits fine height adjustment of the electrodes. Six electrodes are supplied, two point source 'two line source' and two circular and two circular rings of 35 and 70mm dia. respectively.

Simple apparatus to demonstrate Boyle's Law. Consists of a graduated plastic syringe mounted on wooden block, piston of the syringe mounted on another platform. Pressure volume measurement can be made by stacking different weights.

It comprises two aluminium tubes telescoping into each other, so that the column of air within the tubes may be altered from 30 cms to 53 cms, outer tube fits into a wooden base.