This, circumstantial though it be, is evidence for thinking that the weight drive and some form ofescapement were known to Richard of Wallingford, ca.
Without doubt, the crown and foliot type of escapement appears to be the first complicated mechanical invention known to the European Middle Ages; it heralds our whole age of machine-making.
The to-and-fro motion of the mechanical clock escapement is quite an impressive feature, but there seems to be no literary reference to it before the time of de Dondi.
Unfortunately the text does not appear to give any relevant information about the presence of anescapement or any other regulatory device, nor does it mention the source of power.
Queen, entitled, ‘On the Construction and Theory of the Dead-Beat Escapement of Clocks.
The anchor-escapement was invented by Clement, a London clockmaker, in 1680.
A very detailed and learned pamphlet has just been written on this beautiful escapementby Benjamin L.
In ordinary square or upright pianos of London make, the escapement lever or jack, so made that it can be taken out and replaced with the key; -- called also the hopper.
Note: Watches are often distinguished by the kind of escapement used, as an anchor watch, a lever watch, a chronometer watch, etc.
Defn: the wheel in an escapement (as of a clock or a watch) into the teeth of which the pallets play.
Of course, it was the ticking of the clock escapement that misled him--and me.
In the succeeding silence the measured beat of the escapementwas plainly audible.
The first used was the remontoire but since the invention of the gravity escapementfor the Westminster clock by Sir Edmund Beckett this has been used instead.
It has been superseded by the gravity escapement for large clocks and is inferior to the dead-beat for small.
It had the old duplex escapement of the days of Tompion and the dial was printed on paper, covered with celluloid and glued to the plate.
The Mudge escapement was essentially like the modern Double Roller.
A form of lever escapement designed to obviate the evils of overbanking.
Instead of the three pins for lifting as in the Double Three-Legged Gravity escapement there is a triangular steel block which acts against large friction rollers, pivoted one on each pallet.
GUARD PIN—A pin in a lever escapement which prevents the pallets leaving the escape wheel when the hands of a watch are turned back.
A lawyer by profession, and the inventor of the gravity escapement for turret clocks; also an authoritative writer on horological subjects.
The escapement is the most important part of the whole mechanism, because it is the part which makes the clock keep time.
He associated closely with such scientists as Hooke, and Barlow, and made practical application of their theories—two notable instances being the cylinder escapement and the balance-spring.
The escape wheel of the verge escapement is an illustration.
From that time on, the important improvements of clockwork were chiefly made in two directions—those of the mechanical perfection of the escapement and the compensation for changes of temperature.
The shaft carrying the signal transmitter brush carries also an escapement wheel, the pallet of which is directly controlled by an electromagnet.
This, in turn, energizes the private magnet which makes a single movement of its armature and allows the escapement finger on the side switch arm to move one step and bring the side switch contacts into the second position.
The single movement of the private magnet armature allows the escapement finger on the arm 5 to move one step and this brings the side switch contacts into the second position.
The escapement wheel is a single toothed disk attached directly to the shaft which carries the signal brush and its pallet is attached rigidly to the magnet armature.
It is to be noted that the escapement which releases the side switch arm may be moved either by the private or by the rotary magnet, since the armature of the latter has a finger which engages the private magnet armature.
They are then restrained by an escapement device similar to a pallet escapement in a clock, the pallet being controlled by the register's magnets.
Townspeople of Cincinnati and elsewhere became so proficient in distinguishing these sounds of steam escapement that they could foretell the name of any craft on the river at night or before it appeared in sight.
The necessity originated several crude signs, chief among which was the noise created by a sudden escapement of steam either from the rarely used boiler waste-pipes close to the surface of the river, or through the safety-valve above.
Probably the pointed pallet escapement was used first, it being the less expensive of the two.
The escapement is special, as we have seen, but the fork, roller, and balance action are conventional.
It covers a device actuated by a spur on a balance staff to lock the detent against tripping when in one position and to permit normal operation of the chronometer escapement when in the other position (see fig.
This, of course, was aimed at making it possible to use the escapement in connection with a mainspring of greatly varying power.
In other words, with two pins in the escape wheel the escapement will beat quarters of a second, because starting from a point of repose the wheel will be arrested on the other point of repose after turning through 90°.
The beat of theescapement is two per second and the movement revolves once in 20 minutes.
Overbanking protection may well have continued to be necessary, particularly if the gear ratio between escapementand barrel was low enough to permit hourly rotation of the barrel.
The lever escapement is the only one known to have been used, but two varieties of this are found (see fig.
The conventional club-tooth escapement was probably substituted as less troublesome, although the banking pins were fixed and could only be adjusted by bending them.
His solution was to mount the escapement in a frame or "chariot" which revolved, usually once a minute, so that with each revolution all possible positions were passed through (fig.
At C is shown the carriage which revolves with pinion B carrying the escapement and balance around the stationary wheel G.
There is no jeweling in the escapement or on the other end of the balance staff.
Also, looking at the perspective view, we see that while the chronometer escapement has been retained, the balance has been placed eccentrically to make room for the center arbor.
Nothing could surpass the delicacy and ingenuity of his free escapement with a maintaining power.
Breguet conceived the bold thought of inclosing the whole mechanism of the escapement and the spring in a circular envelope, making a complete revolution every two minutes.
In other words, so far the balance of our reasoning is in favor of the club toothescapement and to effect an intelligent division of angles for tooth, pallet and lift is one of the great questions which confronts the intelligent horologist.
Some of the finest ones only make 8 or 9° of a movement; the smaller the angle the greater will the effects of defective workmanship be; 10° is a common-sense angle and gives a safe escapement capable of fine results.
Therefore for the finest watches the equidistant escapement is well adapted, but for anything less than that the circular should be our choice.
We will again proceed with the delineation of the escapement here illustrated.
Many improvements were made upon it until to-day it is the best form of escapement for a general purpose watch, and when made on mechanical principles is capable of producing first rate results.
The greater the drop the deeper must be the lock; 1½° is the angle generally allowed for the lock, but it is obvious that in a largeescapement it can be less.
When the escapement is being unlocked the guard pin i enters the hollow and when the escape tooth comes into contact with the lifting plane of the pallet the pin i, Fig.
There is no difficulty about it in the English lever, and we have shown in our example that a judiciously planned club tooth escapement of medium size can be made with the center distance properly planted.
The weak points in thisescapement are that the unlocking resistance is greater on the engaging than on the disengaging pallet, and that neither of them lock on the tangents AC and AD, at the points of intersection with EB and FB.
A number of years ago we constructed the escapement model which we herewith illustrate.
As soon as the first matrix has escaped, the escapement resumes its original position, the upper pawl falling, while the lower one rises so as to hold the second matrix, which assumes the position previously occupied by the one released.
Thus it is that the alternate rising and falling of the two escapement pawls permits the matrices to escape one at a time.
Each channel has at the lower end an escapement B to release the matrices one at a time.
The key-rod C, suspended from the rear end of the escapement B, tends to hold the lower pawl b in an elevated position, as shown in Fig.
When the escapement B is rocked, it withdraws the lower pawl b, as shown in Fig.
A protracted comparison undertaken by Mr. Armitage also showed that the escapement of our watches was very nearly what we had assumed.
The escapement is in front, so that every tooth is seen as it frees itself.
Its escapement is one which I suggested many years ago in the Cambridge Transactions; a detached escapement, very closely analogous to the ordinary chronometer escapement, the pendulum receiving an impulse only at alternate vibrations.
I communicated to the Cambridge Philosophical Society a Paper on the Theory of Pendulums, Balances, and Escapements: and I find applications of Babbage's symbolism to an escapementwhich I proposed.
The adoption of the going-barrel has been made satisfactory by the improvements in the variousescapement actions.
The shaft is permitted by the escapement to revolve once an hour.
The teeth of the mainspring drum gear with a cog on the minute-hand shaft, which also carries one of the cogs of the escapement train.
To Thomas Tompion, "the father of English watchmaking," is ascribed the honour of first fitting a hairspring to the escapement of a watch, in or about the year 1660.
The last wheel of the train of gears was provided with escapement teeth, somewhat similar to those used on our clocks and watches, but which would alternately move the lever this way and that.
The pressure of the escapement teeth against the pallets is just enough to keep the pendulum swinging and the speed of the clock is regulated by lengthening or shortening the pendulum.
The escapement was not always placed in the traditional location in the upper center between the plates.
The invention of the anchor escapement in about 1670, and the consequent greater accuracy in time-telling, led to increased preoccupation with precision.
He favored the recoil anchor escapement in his clocks and the Graham dead-beat anchor escapement with a seconds' pendulum.
He informs us that the clock is made of wood throughout, excepting the escapement and the dial, which are made of brass.
The Doctor referred him to Mr. George Graham, the distinguished horologer, inventor of the dead-beat escapement and the mercurial pendulum.
The invention of this escapementis the greatest event in the history of the clock.
The escapement is the same as in the first weight-clock.
Like De Vick's clock also Huygens's clock had itsescapement wheel acting upon two pallets.
In the clepsydra the trickling of water regulated the descent of the weight; in De Vick's clock the trickling of power or force from the escapement regulated the descent of the weight.
Bréguet conceived the bold thought of enclosing the whole mechanism of the escapement and the spring in a circular envelope, making a complete revolution every two minutes.
Examination of the motion, pivots, regulator pins, escapement and poise proved them to be satisfactory.
A defective escapement or regulator pins tightly closed may also be responsible.
The locking of the escapement was examined and found to be satisfactory, so the balance was again removed and tested for poise which was also found satisfactory.
Stopping by Escapement Locking when Hands are set Backward or When Watch Receives a Jar.
Stopping by Escapement Locking When Hands are Set Backward, or When Watch Receives a Jar.
In the figure, A is the escapement, B the escapement wheels and a, b, the pallets, which are cut at suitable angles to actuate the pendulum.
In old clocks there is a verge escapementwith a cross-bar balanced by weights.
Hooke, who was born at Freshwater, Isle of Wight, who invented the anchor escapement for clocks and contested the invention of the balance spring in watches with Huygens.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "escapement" in a variety of sentences. We hope that you will now be able to make sentences using this word.
