This is a model of a steam engine invented by Hero of Alexandria in about 60 AD. 
Hero's engine illustrates transformations of energy and aspects of Newton's laws of motion. 
It represents an early example of a machine that will transform thermal energy into kinetic energy. 
The engine operates similarly to a rocket engine. 
The thermal energy supplied by the bunsen burner (not supplied) is transformed into kinetic energy in the steam jets. 
These jets possess momentum, and by Newton's third law ('action and reaction are equal and opposite'), give backward momentum and hence backward force to the nozzles from which they emerge. 
These forces create a turning movement about the longitudinal axis of the glassware and hence the glass apparatus rotates.

This complete apparatus has a 150mm adjustable mirror scale to prevent parallax error and is marked in millimetres and mounted on a sturdy 300mm rod.
Attached to the rod is a hook supporting a coiled spring with a mass hanger and indicator. 
The apparatus is mounted on a wooden base.
To demonstrate that the relationship between the extension on a spring is proportional to the load applied to it. 
Supplied complete with a 250g slotted weight set and 3 springs. 

Designed to show that water has a maximum density at 4°C. 
In winter, ponds and lakes are cooled from above. 
The water above continues to cool until it freezes, then the ice provides an insulating layer that keeps the denser water beneath from cooliing as quickly. 
The comparatively warm layer on the bottom enables aquatic life to survive. 
Were water not to have its maximum density at a temperature above its freezing point, then ponds and lakes would freeze throughout and, because heat conduction between air and ice is such a slow process, possibly fail to thaw even during the summer months.
Convection then occurs throughout until a dense layer of water at 4°C forms on the bottom.  

A sheathed miniature heater specially designed for use with metal block calorimeters. 
Electrical connection is via 200mm leads with heat resisting insulation and 4mm terninals. 

Technical Specifications :
Power: 12V, 50W.
Length: 100mm
Diameter: 12mm

This traditional induction coil is capable of producing a spark with an input of 6-12V DC and is therefore ideal for use with vacuum tubes, eudiometers etc. 
A fully adjustable vibrator system is incorporated with spark suppression capacitors in the base. 
Low voltage input is via a pair of baseboard mounted 4mm sockets. 
A pair of pointer electrodes is supplied with the instrument, the pointer electrode having an insulating handle for spark gap  adjustment. 

Technical Specifications :
50mm spark

The gauge gives instant pressure readings and reduces the inconvenience when using a manometer. 
Comprising a thin-walled spherical bulb connected to a mechanical pressure gauge. 
Clamp not included.

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The Joulemeter/Wattmeter is light, compact, and designed for class demonstration or student use. 
The unit can measure energy taken up by a load, either by AC power or DC power, and from 1J to 999,999J or 1mJ to 999,999mJ and can also measure power level of 200mW to 200W. 
Depending on mW / mJ or W / J range, 1V full scale deflection represents 100mW or 100W respectively.
One pair of 4mm sockets is also provided to indicate the instantaneous power. 

Technical Specifications :
Design: single chip microprocessor with dedicated precision analogue multiplier for power measurement.
Built-in timing function
Input Voltage: 0 to 15V AC, (0 to 21V DC), absolute maximum 35V DC, 24V AC
Input Frequency: 0 to 500Hz Maximum
Maximum current: 10A AC / DC
Accuracy: 5%, typically better than 3% at full scale.
Energy / Power Indications: 6 digits
Power Supply: 220V A.C. 50/60Hz
Dimensions: 208x155x115mm

Large demonstration model. 
Power: 6V AC.
Polystyrene balls included.