National Gas Engine fires up, runs, and shuts down

A 94 horse power National gas engine from 1909 runs at the Cambridge Museum Of Technology. This is one of two engines of this type in the engine room. To quote the museums website : "Before the engines can be started they have to be in exactly the right position. The flywheel, which weighs 3.5 tons (3556kg), is rotated by engaging the geared handwheel into the cogs on the flywheel. This is turned until the crankshaft is 30 degrees (0.523 rad) after top dead centre. These engines by the way are so solid that I can balance an old two bob bit on its side whilst the whole thing is in use and it will remain upright throughout. Anyway the mixture of gas and air is then pumped by hand into the combustion chamber or cylinder which burns and expands, driving the piston to turn the flywheel. The inertia of the flywheel keeps the engine turning, more gas and air are drawn into the cylinder and the mixture is ignited automaticallly by the spark from the magneto." (source : www.museumoftechnology.com ) For the museums home page : www.museumoftechnology.com



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