Glass World

Ambala Cantt, Ambala, Haryana

Also called Demonstration Induction Coils consists of two coils wound on separate bobbins, one having many turns of fine wire & the other with few turns of heavy wire. It demonstrates that induced potentials are produced either by movement of a permanent or electromagnet or by a change of current in one coil, fitted with insulated 4 mm socket terminals & supplied with a soft iron core, outer coil is 12. 5 cm long & is of 5 cm diameter. 

A compact visual teaching aid which is robust in construction wood board 400 x 280 x 13 mm with matt white surface, mounted on rubber feet carries a circular scale with four quadrants 0 – 90º graduated every 2º, with two lines at right angles. The ray box is provided with slots to accommodate metal slits, colour filters, lenses etc., & is fitted with a 12V 24W line filament. 

Newton’s Ring Apparatus: Consists of a plano convex lens, 63 mm dia & 2000 mm focal length, on a flat glass plate of equal diameter. Both enclosed in a metal ring frame with compression adjusting screws equispaced to ensure correct contact between the two elements.

Newton’s Ring Apparatus: For measurement of wavelength of light by the reflected system. Comprising a frame 60 x 58 x 50 mm with a glass plate 56 x 47 x 3 mm mounted at an angle of 45º to reflect the light downwards on to a plano convex, 32 mm diameter x 1 m focus, which rests on a plane glass plate 38 x 38 x 3 mm on the base of the box. Complete with lens.

To demonstrate thermal expansion. Comprising a brass ball 25 mm diameter, a brass ring mounted on a rod with a wooden handle, a chain is provided to hold the ball with the ring. The ball passes through the ring when cold but does not after being heated 

A casted brass gauge with wooden handle, sliding fit over ends of bar & with hole 12.5 mm bore in both arms & a mild steel bar 110 x 12.5 mm with wooden handle. 

To show force of contraction or expansion. A heavy cast iron base with 4 uprights, on one end of which is fitted a hand nut, the other drilled with holes to carry a cast iron rod of 75 x 6 mm size bearing against narrow flats, overall size 330 x 60 x 60 mm with 12 cast iron breaking rods. 

With a glass U tube with a bulb & tap at the upper end of one limb, other limb open. From the bottom of the U is an outlet tube which passes through a bung & terminates into a tap. The bulb has a capacity of 7 cm³ & the stem beneath is graduated 3 x 0.1 cm³ allowing for expansion over a range of 100ºC. The apparatus can be supported by a single clamp & only 20 cm³ of mercury is required. 

To show the differences in expansion of different liquids over the same temperature. Comprising five bulb tubes with plastic scales, mounted in a frame & supported in a G.I. sheet water trough 240 x 100 x 75 mm deep. The frame has clamps to secure it to the trough & two cross members having holes & upper tubules to locate the bulb tubes in bungs complete with 35 mm diameter bulbs & 150 mm scales etc. 

The elongation of rod is measured by a micrometer screw. The brass tube is 500 x 25 mm C.P. With inlet & outlet tubes for steam & opening for thermometer reading to 1 x 110C. The binding posts are provided on the supports for connecting a belt, buzzer, or galvanometer for indicating the exact point of contact of the screw. Provided with three rods of Brass, Iron, & Aluminium. 

For demonstrating the transmissibility of fluid pressure. Comprising two brass cylinders 19 mm & 38 mm diameter fitted with pistons & connected by a brass tube. For loading mass, the pistons are provided with rods terminating in circular platform of diameter 75 mm each. The apparatus is mounted on a polished wooden base 200 x 100 x 22 mm & overall height with both pistons at the bottom of their cylinders is 245 mm. 

Comprises a shallow glass dish100 x 10 mm & a pair of socket terminals/ electrode holders that clip onto its rim. A compliments of six electrodes is supplied, two point source, two line source & two circular rings of 70 & 35 mm diameter respectively. 

To show that the pressure of a liquid varies with depth & not the shape of the vessel. With glass vessels of 4 different shapes mounted in leak proof metallic collars mounted on a metal base. With plastic bowl. 

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 90 x 90 x 30 mm. 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 4 mm socket terminals for connection with 12V supply. With instructions. 

Comprising two iron casted stand of 180 mm height joined by two chrome plated rods, with an expansion rod, length 380 mm, fixed on one stand & resting on a Friction pointer placed at the other. With graduated scale 0-90º with 3 expansion bars of Iron, Aluminium, & Brass. 

For demonstration of relationship between capillary pressure and the bore diameter of capillary tube. The apparatus comprises of a metal frame, the base of which forms 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 filled with water and the difference in heights of the resulting columns of water in the tube is readily apparent. Overall height of the frame 90 mm, length of capillary tube 150 mm.