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56

Laboratory Apparatus for Experimental Mechanics and Engineering.

These pieces of apparatus are used for experimental verification of the laws of friction, stresses, and strains in materials, energy of mass in motion, the principle of work, the mechanical advantage derived hy a combination of wheelwork pulleys and levers, screws, worm and worm-wheel, and the action of springs.

Models of mechanism, linkwork, kinematic pairs, and gyroscopes of various types.

Sectional Model of the Steam Engine (Fig. 3), whereby the action of the piston and slide valve is clearly shown. In the model the distribution of steam may be followed with reference to its admission, cut-off, expansion, and release. The eccentric may be adjusted, and the angle of advance determined and read off. The valve can be set and reset with varying amounts of lap and lead.

Fig. 3.

A special mechanism is provided for producing autographic diagrams of the valve movements.

Sectional Models of Stephensons Reversing Gear, Joy's Gear, Walschaert's Gear, Meyer's Gear, and other types.

Sectional Model of the Locomotive Engine Gear for the Instruction of Locomotive Engine Drivers and Firemen.

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