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Diffraction Grating (0587)
Useful for studying the spectrum. Mounted in 50x50mm slide frame. Available in resolutions
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DIFFRACTION GRATING SLIDE (0588)
Demonstrates the basic principle of the diffraction grating and for exploring the dependence of its properties on its resolution (lines per unit length). Comprises a set of 3 gratings -100, 300 and 600 lines/mm, mounted on a single slide card mount with three apertures of 16x9mm, one for each resolution, which is clearly marked below each aperture. With protective coating.
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POLARIMETER, LAURENT'S HALF SHADE (0589)
For measurement of optical rotation of pIane polarized light by solutions of optically active substances. Comprises of two polaroids - fixed polarizer with Laurent's Half device and rotatable analyzer, mounted at the opposite ends of a tube along the same horizontal axis. The analyzer has
a circular scale graduated 0-360? x 10, along with a vernier reading to 1/10? mounted alongside for measuring the degree of rotation of analyzer with respect to the polarizer, which makes both analyzer and vernier to rotate simultaneously. Provided with locking screw to lock their motion and fine adjustment knob. The tube has a long window at the center along its length with a shutter, for placing sample tubes aligned along the axis of polarizer / analyzer with inside painted black to minimize internal reflections. Complete assembly mounted on a heavy cast metal stand with adjustable height. Includes a sample tube about 200mm long.
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TRANSFORMER, SODIUM VAPOUR LAMP (0590)
Grid leak type, for operating Sodium Vapour Lamps rated at 35watts. Operates on AC Mains, 220-240V, 50/60Hz
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SODIUM VAPOUR LAMP (0591)
Suitable for spectroscopy, polarimetry, refractometry and interferometry. Complete with vacuum jacket, rated 35 watts. For producing highly intense monochromatic light. Each lamp has a glass envelope with an inner discharge tube containing the gas or vapour and two electrodes. The envelope is mounted on an E. S. cap, providing an arc centre height of about 110mm. Each lamp is fully interchangeable, without any adjustment.
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LAMP HOUSE & TRANSFORMER (0592)
Specially designed lamp house and transformer for operating different types of spectral lamps that ensures almost immediate striking of the Spectral lamps no sooner they are switched ON and provides a steady light output of high intensity. Transformer encased in a two part aluminium extrusion with insulated plastics side supports for safety having overall dimension of about 230 x 165 x 115mm (LxWxH). Plastic side supports have holes for proper inside ventilation. Provision for mounting a support rod, about 50cm in length, from the top of the transformer casing for holding lamp house makes the apparatus a convenient self-contained assembly. Rod projects more than 40cm above the casing, and provides convenient vertical adjustment in the lamp house position. Lamp house comprises a cylindrical sheet metal enclosure closed at one end with a circular aperture for lamp output. ES Cap type porcelain lamp holder located on inner side of the closed end is used for mounting lamps and provides adequate insulation and safety to the user. It is connected to the transformer through a three-core lead. One side open lamp house is located on top while use to permit uninhibited ventilation to the lamp. It has auto leak transformer operating on AC mains input of 230? 10% volts, 50/60Hz, with fused input protection and power rating of 90W. The transformer has an excessively high leakage reactance to achieve highly drooping current-voltage characteristics, making the secondary output automatically drop from about 470V at no load, regulating the current to 0.9A at the desired voltage to obtain full luminous output from the spectral lamps.
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MERCURY VAPOUR LAMP (0593)
Rated 80watts, operates on 220-240Volts, 50/60Hz.
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TRANSFORMER, MERCURY VAPOUR LAMP (0594)
Suitable for Mercury Vapour Lamp, SO watts. Operates on AC Mains, 220-240V, 50/60Hz.
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WAVE FORM HELIX LONG (0595)
Steel wire close-wound helix of about 18mm diameter and closed length of about 3m extending to approx. 8m. With looped ends. Useful for demonstrating wave motion.
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WAVE FORM, HELIX, SLINKY (0596)
For demonstrating wave motion. Helical coil of flat section, tempered steel wire.
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WAVE MACHINE, POWELL'S (0597)
For demonstrating the movement of progressive transverse waves. Comprises a number of circular discs mounted equidistant from each others on a horizontal shaft in gradually varying degrees of eccentricity, with each disc having a vertical rod of same length supported on top and sliding up and down into a pair of guides. Complete assembly mounted on a wooden base.
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WAVE APPARATUS (0598)
For demonstrating both longitudinal as well as transverse motion simultaneously. Construction similar to Cat No. 1120060, but of the total rods supported on eccentric discs, about 2/3rd rods straight and 1/3rd rods bent in L-shape, with the L-shaped rods sliding into a vertical guide and depicts longitudinal wave motion.
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WAVE APPARATUS, PLASTIC (0599)
Completely made of plastic with basic design and functionality similar to
WAVE APPARATUS. The plastic highlighted tips provide easy observation of wave motion. The rotating handle is fitted with a circular scale marked in degrees to indicate the rotation.
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BELL IN VACUUM (0600)
Demonstrates that sound waves need material medium for propagation and cannot travel through vacuum. For use on pump plates with diameter at least 15cm. It consists of an electric Bell operating on 4-6 volts AC/DC, suspended inside bell jar through a pair of thick metal wires from a rubber bung that seals the jar from the top. The wires terminating in 4mm socke.t terminals on the upper side of rubber bung for electrical connection to the bell.
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RESONANCE APPARATUS (0601)
Useful for determining wavelength and velocity of sound in air by exploring the resonance of air column. Comprises of a pair of telescopically mounted metal tubes, one sliding inside other for varying the air column. Length of resonating air column helps in computing the velocity of sound. Mounted on stable base.
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