Calendar: 1888-1889 Page 759

ENGINEERING DEPARTMENT 751 θ explanation of their action In what cases may the pulsometer be applied with economy Describe the method adopted by the London Hydraulic Power Company for obtaining continuous high pressure upon the water in the mains Make such sketches as may be necessary to illustrate the construction of the machinery employed At the Battersea Waterworks the water is raised by plunger pumps into air vessels and stand pipes Sketch section through plunger pump showing the suction and delivery valves and explain the uses of the air vessel and of the stand pipe What points have to be observed in constructing pump valve Explain the calculations which have to be made in order that the valve may be just balanced by the pressure of water when passing through it Sketch longitudinal section through Giffard's injector showing the manner in which the flow of steam and of water is regulated Explain fully the principle of its action The internal tubes of Lancashire boiler are exposed to external pressure Show how they may be strengthened in order to avoid collapse Sketch section through locomotive boiler and describe fully how the large amount of heating surface and the strong draught which are requisite are obtained In some steam engines the slide valve has Mead What is the effect of giving lead and why is it used What is outside lap' as applied to the slide valve and what is its effect upon the ingress of the steam to the cylinder 10 Sketch an indicator diagram such as you would expect to get from an expanding and condensing engine using steam with an initial absolute pressure of 60 lbs per square inch The steam being cut off at fifth of the stroke what will be its final pressure Mark approximately the point at which the exhaust will open and the point at which com- pression will commence