The pendulum has swung back.
And then he walked away, his shoulders swaying like a pendulum with his stride.
The times were measured by pendulum clocks.
For small earthquakes, in which the movement is rapid, the bob of a very long and heavy pendulum will practically comply with these conditions.
The determination of the true relation between the length of a pendulum and the time of its oscillation; the invention of the theory of evolutes; the discovery, hence ensuing, that the cycloid is its own evolute, and is strictly isochronous; the ingenious although practically inoperative idea of correcting the "circular error" of the pendulum by applying cycloidal cheeks to clocks - were all contained in this remarkable treatise.
His application of the pendulum to regulate the movement of clocks sprang from his experience of the need for an exact measure of time in observing the heavens.
Pins, in pendulum links suspended from similar pins in saddles 9 ft.
Chladni's experiment of strewing a vibrating bell with flour, investigated the nature of sound and the function of the air in respiration and combustion, and originated the idea of using the pendulum as a measure of gravity.
Testing is begun when the temperature reaches 66° by slowly drawing the slide open and reclosing it, the speed being regulated by the swing of a pendulum supplied with the instrument.
Here the style s of the pendulum rests in slots in the short arms of two writing levers pivoted at o and o'.
At the beginning of 1680 he presented a paper to the Royal Society, De nova temporis dimetiendi ratione et accurata horologiorum .constructione, in which he attempted to deprive Huygens of the honour of applying the pendulum to the measurement of time.
Recently, however, the pendulum of opinion has swung back towards the original view: and Dr R.
In 1826 the idea occurred to him of attacking this problem by means of pendulum experiments at the top and bottom of a deep mine.
In the north the pendulum swung back once more and the French reoccupied Milan in April, causing the downfall of the Sforzas, much to Alexander's gratification.
In a refined form this method is often employed for measuring the intensity of a magnetic field at a given place, just as the intensity of gravity at different parts of the earth is deduced from observations of the rate at which a pendulum of known length vibrates.
The two opposing theories express at bottom, in the phraseology of their own time, the radical divergence of pantheism and individualism - the two extremes between which philosophy seems pendulum-wise to oscillate, and which may be said still to await their perfect reconciliation.
Believing that the pendulum had overshot its swing from conventional classicality towards pictorial realism, he turned from the " fleshy " school towards the Greek, while realizing the artistic necessity for modern feeling.
These oscillations of opinion arP frequent, if not universal, and it is only after more than one or two swings that the pendulum remains at the perpendicular.
During Nansen's expedition on the " Fram " in 1894-1895, Scott Hansen made observations with a Sterneck's half-seconds pendulum on the ice where the sea was more than 1600 fathoms deep and found only an insignificant deviation from the number of swings corresponding to a normal ellipsoid.
Let two such masses of matter be suspended by strings from the same point, and then let one mass be drawn aside, pendulum-wise,.
Of Sabine's scientific work two branches in particular deserve very high credit - his determination of the length of the second's pendulum, and his extensive researches connected with terrestrial magnetism.
By the end of the century, however, owing to a great extent to the publication of the essays of Malthus, the pendulum had swung far in the opposite direction, it was thought desirable to possess the means of judging from time to time the relations between an increasing population and the means of subsistence.
There was one opening in its disk, and through this was viewed the pendulum of a clock beating seconds.
On the pendulum was fixed an illuminated silver bead which appeared as a bright point of light when seen for an instant.
Let us suppose that he notes the positions of two of these next to each other in the beat of the pendulum one way.
If the fork makes exactly 32 vibrations and the wheel 8 revolutions in one pendulum beat, then the positions will be fixed, and every two seconds, the time of a complete pendulum vibration, he will see the two positions looked at flash out in succession at an interval of a second.
Then the first flash in the new position is viewed by the 8Nth passage of the opening, and the second flash in the original position of the first is viewed when the pendulum has made exactly N beats and by the (8 N + i)th passage of the hole.
Thus if a pendulum always receives a slight impulse in the direction of motion just about the lowest point, this is equivalent to an increase of the restoring force if received before passage through the lowest point, and to a decrease if received after that passage, and in either case it tends to maintain the swing.
If the bob of the pendulum is iron, and if a coil is placed just below the centre of swing, then, if a current passes through the coil, while and only while the bob is moving towards it, the vibration is maintained.
Below this pendulum let there be placed another coil through which passes the current to be measured; then when currents pass through these coils the pendulum of the second clock will be either accelerated or retarded relatively to the other clock, since the action of gravity is supplemented by that of an electric attraction or repulsion between the coils.
By the use of a permanent magnet instead of a shunt coil as the bob of one pendulum, the meter can be made up as an ampere-hour meter.
Also experimented on the pressure of powder and the velocity of the bullet in a musket barrel; this he accomplished by shortening the barrel successively, and measuring the velocity obtained by the ballistic pendulum; thus reversing Noble's procedure of gradually lengthening the gun.
Of the pendulum appears in D.
He clearly perceived the significant analogy between terrestrial gravity and the force exerted in the solar system, and by the ingenious device of a circular pendulum illustrated the composite character of the planetary movements.
As was naturally to be expected, the pendulum swung to the other extreme, and in a more critical age the existence of Arthur was roundly denied.
He has therefore lost sight of the truths that bodies are triply extended, mutually impenetrable substances, and by this force causes which reduce one another to a joint mass with a common velocity on collision, as for instance in the ballistic pendulum; that these forces are the ones we best understand; and that they are reciprocal causes of the common velocity of their joint mass, whatever happens afterwards.
He attained correct views as to the character of centrifugal force in connexion with Galileo's theory; and, when the fact of the variation of gravity (Galileo's acceleration) in different latitudes first became known from the results of pendulum experiments, he at once perceived the possibility of connecting such a variation with the fact of the earth's diurnal rotation relatively to the stars.
But Huygens's most important contribution to the subject was his investigation, published in 1673, of the motion of a rigid pendulum of any form.
Foucault's pendulum is another example of motion relative to the earth which exhibits the fact that the earth is not a Newtonian base.
He had, however, some years before, when he was a medical student, noticed the apparent regularity of successive swings of a pendulum, and devised an instrument for measuring, by means of a pendulum, such short periods of time as sufficed for testing the pulse of a patient.
The use of the pendulum clock in its present form appears to date from the construction of such a clock by Huygens in 16J7.
If a style projecting from this pendulum rests upon say the smoked surface of a glass plate fixed to the ground, the vibratory motion of the ground will be recorded on the glass plate as a set of superimposed vibrations.
B is the bob of a pendulum, with its style s passing through a slot in the short arm of a light lever, sop, pivoted at o, and with its outer end resting upon a revolving cylinder covered with smoked paper.
3) consists of an ordinary pendulum diagrammatically represented by ab, connected by a universal joint to an inverted pendulum dc. The latter, which is a rod pointed at its lower end and loaded at c, would be unstable if it were not connected with b.
In the new position b would tend to follow the direction of its point of support, whilst c would tend to fall in the opposite direction, and the bob of one pendulum would exercise a restraint upon the motion of the other.
In this way, by coupling together an ordinary pendulum about 3 ft.
Such a system is called "conservative," and is well illustrated by the swinging pendulum above referred to.
In order to understand the sharp swing of the political pendulum back from republicanism to autocracy which took place at Brumaire, it is needful to remember that the virtual failure of the Egyptian Expedition was then unknown.
Oolites of Pendulum Island in East Greenland.
Nor is this its only association with science; for it was one of the spots chosen by Sir Edward Sabine for his series of pendulum experiments in 1823.
Recent pendulum observations have shown that it is incorrect to assume a uniform density of 2.6 in the elevated part of the earth's crust, that on the contrary there are great local differences in density, the most important being a confirmation of Airy's discovery that there is a marked deficiency of mass under high mountains and a marked excess under the bed of the ocean.
Its principle is as follows: Suppose there are two pendulum clocks, one having an ordinary pendulum and the other having a pendulum consisting of a fine coil of wire through which a current is passed proportional to the potential difference of the supply mains - in other words, a shunt current.
For example, if the falling body s is attached by a thread to the pendulum of a timepiece, it may be used to stop it and indicate the approximate time at which the tremor occurred.
This type of apparatus has been replaced in Japan by what are called duplex pendulum seismographs.
The change was made because it frequently happened that in consequence of the movement of the ground agreeing with the period of the pendulum, the latter no longer acted as a steady point, but was caused to swing, and the record became little better than that given by a seismoscope.
Koenig devised a clock in which a fork of frequency 64 takes the place of the pendulum (Wied.