By turning a 3-way valve at the end of the compressed-air supply-pipe, so that the air rushes into the cylinder above the piston, the piston is pushed to the base of the cylinder and the elevator thereby raised.
This piston is placed in an upright position at the right of the elevator and is connected with the compressed-air service of the building.
At once air is forced into this double cylinder, which you see at the bottom of the stabilizer, filling the half which is to operate its own set of rudders; and a piston begins to work inside.
The piston is connected to a toothed rack, as you will note, causing this to turn a sector engaging it.
The piston is 19 centimeters in diameter, and has a stroke of 15 centimeters.
The pitman to the paddle wheel shaft is to starboard of the centerline of the engine; the steam cylinder piston is slightly off center of the frame and crosshead; and the piston of the air cylinder is close to the port engine frame.
Reference in the account books to an error in Dod's draught of a piston proves that Dod designed the engine.
The relatively slow piston speed and small power put little strain on the moving parts.
The piston to have valves in it, opening inwards to admit air when the piston rises; and shutting, when it is forced down by means of the lever B turning on the centre C.
A, a tube round or square of two feet diameter, in which a piston may move up and down.
The tube to have a valve D, to open when the piston is forced down, and let the air pass out at E, which striking forcibly against the water abaft must push the boat forward.
New piston rings will let you plate the cylinders without reboring them unless you're going to plate them heavily.
The rear end of the cylinder should be bevelled off slightly inside, to allow the packed piston to enter easily.
Push the piston rod through the cover until the piston is hard up against the back of the cover.
Attach the piston rod to the piston, and insert piston in cylinder.
Similarly for the built-up piston valve P may be substituted a piece of close-fitting brass rod with diameter reduced, except at the ends, by filing or turning, to allow the passage of steam.
A steam port, S P, should next be bored in each, and the "burr" of the edges cleaned off carefully so as not to obstruct valve or piston in the slightest degree.
The writer made an engine of the same kind, differing only from that shown in the design of the crosshead guides, without the assistance of a lathe, except for turning the piston and fly wheel--the last bought in the rough.
The face of the crank should be about 3/8 inch away from the piston rod centre line.
Before the gland is soldered to the cover, the cover should be put in place, the piston rod attached to the piston, and the parts of the gland assembled.
The length of this from centre to centre of the pins on which it works should be established as follows:--Slip over the piston rod a disc of card 1/32 inch thick.
Assuming that all the parts mentioned have been prepared, the cylinder should be arranged in its proper place on the bed, the piston rod centrally over its centre line.
A piston fitted snugly into the tube, by means of which the air could be compressed and the phosphorus ignited.
The Carcel lamp, which appeared in 1800, consisted of a double piston operated by clockwork.
Piston air-pumps are driven either by the main engine through a suitable mechanism, or by a separate electric motor.
When the piston moves downwards from the position shown, it cuts off the connection with A by passing over O.
When the piston rises sufficiently to uncover O (as in figure), air rushes from A into the highly-exhausted space D and fills it.
When the upward motion begins, the valves VV close, and the piston rises and creates a vacuum in D.
It consists of a small cylinder communicating with the engine cylinder and fitted with a piston which the varying pressure drives upward more or less against the resistance of a spring.
A packing of soft material round the piston of a steam engine.
A lever imparts motion to a pencil which traces the diagram on a card wrapped around a vertical drum which is turned back and forth by a string connected with the piston rod of the engine.
To expel all the fluid from the middle ear the syringe is emptied and the pistonwithdrawn to its full extent.
If, during the operation progression undergoes more or less variation, that is, for example, if it diminishes at a given moment to afterwards increase, the stroke of the piston undergoes all the influences of it.
The piston head is guided by a slide keyed to the frame.
F, being effected according to the point, a, the stroke of the piston has become absolutely null.
The pump is placed opposite an upright, D, whose top serves as a guide to the prolongation, E, of the piston rod.
In measure as the pressure increases, the stroke of the piston diminishes, and when it has reached its maximum, the motion of the piston ceases entirely.
The piston of the pump is set in motion by a pulley, K, and a cranked shaft actuated by a belt from the shafting.
But if the piston had been fixed the heat required for the same rise of temperature would have been Cv, the specific heat at constant volume.
It was homely but accurate in construction: the beam was of wood, and the piston was an old thick copper penny!
Let heat be given to the air so as to raise its temperature, while the piston moves out so as to keep the pressure constant.
A hole in the dividing partition enables the vortex to be formed, and a piston arrangement fitted to the opposite side enables the impulse to the water to be given from without.
A piston which is provided with one or more valves which allow the fluid to pass through it from one side to the other is called a bucket.
These rings are first turned a little larger in diameter than the bore of the cylinder (in this example 1/2 inch), and then sprung over the piston into the groves prepared for them.
A plunger is a piston made in one piece with its piston rod, the piston and the rod being of the same diameter.
The piston has three Ramsbottom rings, a quarter of an inch wide and a quarter of an inch apart.
The pressure of this steam on the top of the piston will force the latter down.
The reason why the part of the piston rod within the piston has such a quick taper is that the piston has to be taken off the rod while it is in the cylinder.
A is the junk ring, which is secured to the piston by means of bolts as shown.
It is generally arranged that the steam shall be cut off before the piston reaches the end of the stroke.
With the aid of sketches explain how a piston rod is made to work steam-tight through the end of the cylinder.
The most important application of the crank is in the steam-engine, where the reciprocating rectilineal motion of the piston is converted into the rotary motion of the crank-shaft by means of the crank and connecting rod.
The particular piston there illustrated is made of brass, and is secured to a wrought-iron piston rod by a brass nut.
A B is the piston rod, C D a portion of the cylinder cover, and E F the stuffing-box.
Almost all the weight while turning is supported on the piston of a hydraulic press, and the bridge therefore turns round on the water in the cylinder.
Settled and signed the drawings of crank and piston rods.
The faster engines have had a different proportion; the wheels have been larger, or the strokes of the piston shorter.
A certain velocity of the piston is considered the most advantageous.
If you have a closed pipe connected with a piston pump, as at C, as the piston moves to and fro the water in the pipe will move first one way and then the other.
The ladle containing the concrete is passed down behind the tubbing by means of a windlass at the surface, and when it reaches the lowest point, the piston is pushed down and the cement allowed to escape from the chamber.
The fall of the boring-head and piston can also be regulated by a weighted valve on the exhaust pipe, checking the escape of the steam, so as to cause the descent to take place slowly or quickly, as may be desired.
The rods referred to have been found such an inconvenience, that lately a rope on another windlass has been used, and an appliance arranged for dropping the piston by moving the rope.
The counter-check, above mentioned, likewise prevented the piston from striking the cylinder cover with too great a force, when it was brought back by the weight of the tools to its original position.
The balance-beam is continued beyond the point where the piston is connected with it, and it goes to meet the blocks placed to check the force of the blow given by the descent of the tool.
A piston is placed at the top of the ladle, and to this piston is attached a rod, which can be moved from the surface; a door is also attached to the piston.
The engine-man sits close to the engine, and applies the steam above the piston only.
So long as the piston is at rest only one aspect of the work energy of the gas is apparent, namely, the pressure aspect, but immediately motion and transmission take place, both aspects are presented.
The gas within the tube is assumed to be isolated from the atmosphere by a movable piston EF, free to move vertically in the tube, and for the purpose of illustration, assumed also frictionless and weightless.
In proportion as the piston rises, the column of water which follows it gets bigger and bigger, and naturally its weight increases at the same time.
When the piston rises in the tube, it drives before it, as it goes, the air which was already there; and which cannot slip away down the sides because the piston fits so closely to them all the way along.
The result of this is, that just underneath the piston there is a place in the water to which the air cannot reach, and at that place the water has no pressure upon it at all.
When the piston reached the bottom of the cylinder the valve d was opened and the piston again ascended.
Here was one of the things done by Watt for the engine: he contrived to make the steam push the piston down as well as up.
Sometimes the bellows consisted of a hollow log in which a piston was worked up and down (Fig.
When the piston was raised it brought water in and when it was pushed down it forced the water out behind and the reaction of the jet pushed the boat along.
Here P is a piston working in a cylinder A closed at both ends.
The latch E now releases the rod H and the piston is driven down by the air above it, pulling with it the rope L which passes over the pulleys TT.
This condensation of the steam outside of the cylinder and at a distance from it prevented the piston (and cylinder) from getting cold.
Watt did not allow the piston to get cold, for he did not inject any cold water into the cylinder.
A piston in a cylinder was worked by a steam-engine.
Before his invention the piston made only six or eight strokes a minute; after the valves were made to open and shut by the motion of the beam, it made fifteen or sixteen strokes a minute and the engine did more than twice as much work.
Q are the leading wheels, R R the driving wheels, S is one of the cylinders with piston rods and guides bolted to frame and showing double connecting rod at T T.
A to prevent thepiston knocking the cylinder ends.
Then it would be discovered that a piston is blowing because the sound is intermittent, for the blowing through of a valve would be a continuous leaking.
The force with which the steam may strike the piston under such circumstances is very great and often may do damage.
When released by the finger, the piston returns by the action of a spring.
In large bass and contralto instruments, a fourthpiston is added, which lowers the pitch two tones and a semitone.
The cornet à piston is now not very different from the valve bugle in B flat on the one hand and from the small valve trumpet in the same key on the other.
Adolphe Sax, of a single ascending pistonin place of a group of descending ones, by which the tube is shortened instead of lengthened, met, for a time, with influential support.
On alternating strokes the spacer shifted back out of the cylinder; therefore, no contact was made between piston and striker arm.
The two pistons were first pinned together into a single unit which was probably ringless, since it is believed the walls of the outer piston were too thin to admit rings.
The action of the spring keeps the breaker arm and the electrode in constant contact until the push rod on the end of the piston strikes the arm and separates the two parts.
This engine was designed so that the exhaust stroke carried the piston all the way to the head of the engine, while the compression stroke only moved the piston far enough to sufficiently compress the mixture.
This floating piston could move freely a distance equal to the compression space.
Had the engine operated continuously, it is likely that the action of the free piston would have shortly wrecked the engine.
This device shifted a small spacer between the piston and the striker arm of the exhaust-valve rod, permitting the pistonto push open the exhaust valve.
The absence of rings on the piston caused a further loss of power to the already overloaded engine.
When the piston is thrust downwards, it drives the air before it to the furnace; as it is drawn upwards, the feathers collapsing allow the entrance of air from above.
Fire Piston This very ingenious instrument for the making of fire is cast in metal by the Ibans.
The piston consists of a stout stick bearing at its lower end a bunch of feathers large enough to fill the bore of the cylinder.
