Code: PHHE0081

To show the unequal or differential expansion of two different metals in a bimetallic strips. Comprising two strips, each of different metal but if same size, riveted together end to end and fitted on an insulated handle. On heating, the compound strip bends into curvature with metal having more coefficient of expansion on concave side and other one on convex side. Returns back to its original shape on cooling. The thickness of the two metal strips selectable carefully so as to obtain sufficient curving on applying little heat. Comprising a length of bimetal strip 150 × 20mm mounted in a wooden handle. The strip is only 1.5mm thick so that very little heat is required to produce considerable bending. Length overall 270mm approx. 1060260/1 Brass and Invar; 1.5mm thick with strip size 150×20 length × width) 1060260/2 Copper and Iron; size about 200×25mm (length × width) 1060260/3 Brass and Steel; size about 200×25mm (length × width) 1060260/4 Brass and Iron; size about 300×30mm (length × width), with new improved design

Code: PHHE0085

Comprising a cylinder, one half of which is polished wood and the other half the other metal. If paper is wrapped tightly around the cylinder and the rod is held above the flame, the portion in contact with the wood will be quickly scorched while the portion in contact with the metal will remain uncharred, showing the differences in their respective thermal conductivities. 1060280/1 Wood & Metal Cylinder, Small 1060280/2 Wood & Metal Cylinder, Big

Code: PHHE0089

Demonstrates how the bending due to differential expansion of two different metal strips can be used for operating the thermostat for temperature control. A vertically mounted bimetallic strip bends with the rise in temperature causing it to open the electrical contact and closing the same on cooling, thus controlling the switching ON/OFF of the circuit. Consists of binding posts for connection to low current circuits and adjustable contacts. Mounted on base.

Code: PHHE0093

> To demonstrate different thermal conductivities of different metals. The apparatus also facilitates the studying of observations at later stage also through the use of index. Apparatus consists of metal rods mounted vertically on the outer side at the base of a cylindrical copper vessel. The vessel has thick rim at the top for supporting it by ring fitted to a retort stand. Supplied complete with indices. 1060320/1 With 3 metal rods – one each of brass, copper and aluminum, and 3 indices 1060320/2 With 4 metal rods – one each of brass, copper, aluminum and mild steel, and 4 indices 1060320/3 With 5 metal rods – one each of brass, copper, aluminum, mild steel and stainless steel, and with 5 indices

Code: PHHE0097

copper, iron, aluminium and brass fixed in symmetrical fashion, perpendicular to each other, on a wooden frame, with the strips meeting at the center. Outer ends of the strips has small recesses for holding paraffin wax. Metal Strips mounted on circular wooden frame

Code: PHHE0101

Comprising strips of four metals, one each of copper, iron, aluminum and brass fixed in symmetrical fashion, perpendicular to each other, on a wooden frame, with the strips meeting at the center. Outer ends of the strips has small recesses for holding paraffin wax. Metal Strips mounted on square wooden frame

Code: PHHE0105

For demonstration of differences in the thermal conductivity of five different metal – brass, copper, aluminium, mild steel and stainless steel. These 5 metal rods spread radially outward, equally spaced on each side of hexagonal brass hub, and have a small recess at the other end for holding paraffin wax. The sixth side of brass hub has a metal rod terminating in an insulating handle. On heating the central hub, the wax contained in the cavities of different metals melts at different times, implying their different thermal conductivities.

Code: PHHE0109

A metallic disc is fitted with four metals copper, brass, aluminum and iron strips to demonstrate the different thermal conductivities of different materials. Star assembly is fitted with a insulated handle to hold it.

Code: PHHE0113

Comprising three metal rods of different types, one each of copper, brass and iron, fixed on a metal frame and converging at its centre. For comparing the thermal conductivities of different materials. The metal frame can be clamped on a suitable retort stand for safe and convenient working.

Code: PHHE0117

Ideal for comparison of thermal conductivity of different metals quickly and conveniently. Unique, new conductivity bar set features convenient liquid crystal indicators mounted in robust holders. Comprises four identical metal bars of same shape and size, each of different metal – copper, aluminium, brass and steel, held firmly parallel to one another in a rigid moulded carrier with a hole for convenient suspension. Conductivity value of each bar is clearly marked on the back of the support. The sensitive liquid crystal temperature indicators working in low temperature range, are attached to the front of all the four metal bars. The temperature indicators are marked at 1cm interval to facilitate charting the movement of temperature gradients. The rate of heat flow is indicated by timing the colour change across these markers. The demonstration requires only a beaker or container of hot water, thus doing away with open flames, hotplates, or messy "melting wax" method of comparison. Within seconds of placing the ends of the bars in hot water, a visible "heat pulse" travels to the copper bar; the steel bar takes several minutes to conduct the heat to its upper end. Timing the "heat pulses" enables estimation of the relative conductivities and their comparison with the stated theoretical values. Also demonstrates the conduction of heat from a heated bar to its end, if cooled.

Code: PHHE0121

The four aluminum discs with tough anodized surfaces of mirror silver, mirror black, matt silver and matt black have dramatically different properties. Each disc as a 30-60 degree liquid crystal thermometer bonded to them, showing clearly how surface color and texture affects the absorption and reflection of radiant heat. These discs are perfect for rapid are repeatable results for experiment with infrared absorption.

Code: PHHE0125

Metal rods of size about 300 × 3mm (length × diameter). Available in six different metals as detailed below. Also indicated alongside are their respective thermal conductivities in Wm-1K-1 at 373.2K. 1060420/1 Aluminum (240), Pack of 10 1060420/2 Iron (72), Pack of 10 1060420/3 Copper (395), Pack of 10 1060420/4 Lead (34), Pack of 10 1060420/5 Brass (128), Pack of 10 1060420/6 Zinc (112), Pack of 10 1060420/7 Set of 6 rods, 1 each of aluminium, iron, copper, lead, brass and zinc.

Code: PHHE0129

With bulbs supported on a vertical positioned back-panel in place of the frame through the clips. This back panel provides the easy reading of liquid level along the scale, while simultaneously facilitating easy removal and mounting of bulbs in the water trough for their convenient filling, care and cleaning. The water trough has channel shaped slots on the inner side for vertically sliding the back panel into position. 1060460/1 Expansion of Liquids Apparatus, with Back Panel

Code: PHHE0133

For determining the upper fixed point of thermometers and boiling points at Barometric pressures other than the atmospheric pressure. Comprising a double walled upper cylindrical boiling vessel with a steam jacketed inner tube, mounted on a stem boiler. A lid with a tubule is provided at the top, which holds thermometer under test through a holed rubber bung mounted in the tubule. Fitted with a side outlet draining tube and a glass manometric tube 1060480/1 Hypsometer, all sheet metal components of copper 1060480/2 Hypsometer, all sheet metal components of GI sheet, finished in hammer tone.

Code: PHHE0137

To demonstrate that the maximum density of water is at 4°C. Comprises of cylindrical vessel of sheet metal mounted on a base and has an annular trough encircling about midway along its length, which is used for placing ice and salt mixture. Fitted with tubulures to carry thermometers and rubber stoppers. 1060500/1 Hope's Apparatus, Economy, in smaller size

Code: PHHE0141

For the comparison of conductivity of different metal rods. The apparatus consists of six metal rods, one each of copper, iron, lead, aluminum, steel and zinc of size about 150 × 3mm (length × diameter) fixed horizontally through holed rubber bungs inside a sheet metal trough of size about 150×90×100mm. (length × width × height) having six holes on one side. All metal rods have their one end deep inside the trough while other end projecting outside. In use, the rods are lightly coated with paraffin wax and water in the trough is heated. The rates of melting of respective rods can be compared to know their relative conductivities. 1060520/1 Conductivity Apparatus, Ingen Hausz's, with an insulated Plastic handle on each side for holding

Code: PHHE0145

Comprises a sheet metal trough having seven holes at the top (six in one row and one at a side) and mounted on four detachable metal legs. Six holes facilitate vertical mounting of six metal rods, one each of copper, iron, lead, aluminum, steel and zinc through holed rubber bungs, while the seventh one provides for filling the trough with water or mounting of thermometer, if needed. All metal rods have their one end deep inside the through while other end projecting outside. The trough and stand painted with scratch-resistant epoxy coating.

Code: PHHE0149

A classic toy that is really a heat engine. A simple, inexpensive device that demonstrates the cooling effect caused due to evaporation. Simply duck the bird's head into a container filled of water to begin the bobbing motion. Subsequently, the thirsty bird will continue to drink so long as there is water in the container.

Code: PHHE0153

To show the convection currents in a heated liquid. Comprises a rectangular borosilicate glass tube of about 20mm outer diameter with funnel shaped outlet at its one side for filling it with water or any other liquid. It may be mounted vertically on a stand by means of a suitable retort clamp and gentle heating of either of its lower corner produces convection current which can be clearly observed by inserting small amount of dye or any other indicator in it. Approx sizes available are 1060580/1 380 × 300mm

Code: PHHE0157

A very simple device for determination of melting point of amorphous solids. Comprises an aluminium cylinder with an obliquely drilled hole at its top for accommodating thermometers. When a very thin layer of the substance, whose melting point is to be determined, is sprinkled on top of the block and is gently heated, the temperature at which substance melts can be directly read from the thermometer.