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The exhaust valves, on the contrary, have only one guide each, which passes upward through the seat of the admission valve, through the valve itself by means of a collar, and through the stuffing-box.
"I can't see any hole," answered Ned. "But water is coming in here." "Then there's a leak all right! Probably some of the seams are opened, or it may be coming in around the shaft stuffing-box. Here, Ned, take the wheel, and I'll start up the engine again," for with the blow the motor had stopped. "What are you going to do?" asked Ned, as he again made his way forward.
The result was Maudslay's self-tightening collar, the action of which a few words of description will render easily intelligible. A collar of sound leather, the convex side upwards and the concave downwards, was fitted into the recess turned out in the neck of the press-cylinder, at the place formerly used as a stuffing-box.
In a short time the boat was out of the water, but, as Tom grimly remarked, "the water was not out of her," for a stream poured from the stuffing-box, through which the propeller shaft entered, and water also ran out through the seams that had been opened by the collision. "Quite a smash, Tom," observed the boat repairer, when he had come out to look over the Kilo. "How'd it happen?"
For this purpose the stuffing-box is provided; it is really not required if the water runs to waste, as is represented in the engraving.
In his early experiments, Bramah tried the expedient of the ordinary stuffing-box for the purpose of securing the required water tightness' That is, a coil of hemp on leather washers was placed in a recess, so as to fit tightly round the moving ram or piston, and it was further held in its place by means of a compressing collar forced hard down by strong screws.
It consists of a drum A, the sides of which are constructed of stout netting, carried on a vertical axis working through a stuffing-box, which is fitted in the bottom of the outer or containing vessel or keir B. The air can be exhausted from B by means of an air pump.
He elsewhere speaks of the piston-rod "working through the stuffing-box." But in practice, as we have above shown, these methods were found to be altogether inefficient. In this lathe the slide rest and frame were moveable along the traversing-bar, according to the length of the work, and could be placed in any position and secured by a handle and screw underneath.
This shaft has upon its opposite end a plate perforated with holes, E, which is fixed upon the flange of a horizontal pipe, F. This pipe is closed at the other end by means of a plate, E', furnished with a spindle, supported by a stuffing-box, B', and carrying a fly-wheel, G. The central pipe, F, is perforated with a number of small holes.
To carry out this idea the inlet valves are furnished with two guides, which, passing upward through the stuffing-box, are attached to a hard steel cross piece, which receives the action of a bent catch turning on a pin attached to the levers, t1, t2, t3, t4.
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