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The pressure on the pistons must therefore be greater than the traction at the circumference of the driving wheel, in the proportion of 17.278 to 3, or, in other words, the mean pressure on the pistons must be 17,278 lbs.; and the area of cylinders, and pressure of steam, must be such as to produce conjointly this total pressure.
Jackson to help him, for one of the pistons had to be repaired and a number of adjustments made to the cylinders. But that night the motor was fully mended and placed back in the boat. It was in better shape than it had been since Andy had purchased the craft. "There," remarked Tom, "now I'm ready to hunt for those scoundrels. Will you leave your boat at my dock to-night, Andy?"
A very simple carburettor of the float less, single-spray type was used, and the mixture was passed along the hollow crankshaft to the interior of the crank case, thence through the automatic inlet valves in the tops of the pistons to the combustion chambers of the cylinders.
At the speed he was going it would be but a short time before the superheated pistons expanding in their cylinders would tear the motor to pieces. Barney felt that he would be lucky if he himself were not killed when it happened. He reduced his speed and glanced behind. His pursuers had not gained upon him, but they still were coming. A bend in the road shut them from his view.
The considerations outlined regarding balancing pistons and dummy rings can be dispensed with in connection with impulse turbines of the De Laval and Rateau types, and also with double-flow turbines of a type which does not possess any dummies. The same general considerations respecting blade conditions and thrust-blocks are applicable, especially to the latter type.
Thus the four floating pistons were ingeniously made to serve the purpose of springs in equalising the weight, and in softening the jerks of the machine; the weight of which, it must also be observed, had been increased, on a road originally calculated to bear a considerably lighter description of carriage.
The accompanying drawing shows the construction of the engine, in which the seven cylinders are arranged radially on the crank case; the method of connecting the pistons to the crank pins can be seen.
The pistons were fixed to a bed-plate and pointed upwards, so that the pump was, as it were, turned upside down, a position which, among other advantages, allowed of the plungers being covered with water, through which the air was forced and partially cooled.
Like the movements of some beautiful steam-engine, which, with oiled pistons, cranks, and levers, does its unobtrusive work in its own little chamber in comparative stillness, yet with a power that would tear and rend to pieces buildings and machinery, so the firemen sometimes bend to their work quietly, though with mind and muscles strung to the utmost point of tension.
And the platform is moving around for a new load. Take the development of the piston-rod assembly. Even under the old plan, this operation took only three minutes and did not seem to be one to bother about. There were two benches and twenty-eight men in all; they assembled one hundred seventy-five pistons and rods in a nine-hour day which means just five seconds over three minutes each.
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