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Updated: May 24, 2025
Chug would put his ear to the heart of the car, and tap its vitals, and count its pulse-beats as a doctor sounds you with his stethoscope. The look on his face was that of a violinist who tries his G-string. For the rest, he filled gas tanks, changed and pumped up tires, tested batteries, oiled tappets. But the thing that fascinated him was the engine.
In modern rotative land engines, the valves for admitting the steam to the cylinder or condenser, instead of being clack or pot-lid valves moved by tappets on the air pump rod, are usually sluice or sliding valves, moved by an eccentric wheel on the crank shaft.
The cam-shaft here carries only single, not double cams, a decided disadvantage: in order to strike the same number of blows per minute it has to make double the number of revolutions. Moreover, by some unhappy mistake, it is too far from its work, and the result is a succession of sharp blows on the tappets, with injury to all the gear.
"That's all right," he said awkwardly. Tim laughed. "Hey, will this contraption of yours teach me how to adjust a set of tappets?" "No," said James quickly. "It will teach you the theory of how to chop down a tree but it can't show you how to swing an axe. Or," he went on with a smile, "it will teach you how to be an efficient accountant but you have to use your own money!"
Compressed air was tried and abandoned. Tappets, cams, and eccentrics were all tried, to work the slide valve, to obtain the best results. The piston rod of engine passed through both ends of the cylinder, and with long connecting rods worked direct on the crank of the propellers. 'The diameter of cylinder of engine was 1 1/2 inch, length of stroke 3 inches.
Farcot, Edwards, and Lavagrian cut off the steam by the application of a supplementary valve at the back of the ordinary valve, which supplementary valve is moved by tappets fixed to the valve casing.
A few words on the tools as they exist. The most important principle to note, and on which the different machines employed are designed, is this: The punches or matrices acting on the chain at its different points of progress are put in motion by spiral springs worked by means of tappets or cams distributed over the circumference of a cylinder, having a rotary movement imparted to it by pulleys and belts.
In the figures, a is the Steam Cylinder b, the Steam Chest d, a handle for regulating the steam valve f, the starting bar g, g, tappets attached to the valve rod, which is moved by the contact of the arm e, on the piston rod with said tappets h, the double-acting water plunger working through a packing ring o, o, force valves o', o', suction valves.
A. The four valves V, E, V', E' are connected by rods to a single handle H, which handle is moved alternately up and down by means of pins or tappets, placed on the rod which works the air pump.
When the engine is to be stopped, shut the injection valve and secure it, and adjust the tappets so as to prevent the exhausting valve from opening and to allow the steam valve to open and remain open, otherwise a partial vacuum may arise in the cylinder, and it may be filled with water from the injection or from leaks.
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