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Sectional Models of Gas Engine and Parsons’ Steam Turbine.

Wood Painted Models of Machine Details.

Wood Models of Building and Architectural Details.

Mining Instruction Models to illustrate the processes used in mines for the preparation and classification of metalliferous ores.

Sectional Models to illustrate Mining Operations, e.g., buddles, slime tables, classifiers, long wall system, &c.

Cussons’ Calorimeter for Testing Coal.

Instruments and Models for Teaching and Illustrating the

Theory of Balancing Engines and Rotary Parts.

Balancing of Engines. Prof. Osborne Reynolds’ Balancing Model.—The apparatus consists of a four-crank engine with pistons which can be adjusted at any angle relatively to each other. The whole system is supported by an upright vertical steel spring, and the model is driven by a belt and hand wheel. The theory of balancing can be verified by adjusting the cranks and bob weights until perfect steadiness is observed. When out of balance a violent oscillation is the result. The critical speed may also be observed.

Prof. Ewing's Balancing Model.—-This consists of a suspended frame on which is a shaft with discs mounted, and to which bob weights can be attached. All the parts are adjustable to any desired angle. The model is driven by an electric motor.

The model as exhibited is designed to illustrate the balancing-of rotary parts only.

Prof. Wilberforce's Oscillating Spring showing compound Linear and Rotary oscillations..

A Loaded Spring mounted on a Compression Balance for showing the varying dynamical force during oscillation.

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