Big Ben is the 13.5 ton bell in the clock tower of the Houses of Parliament. It was cast at the Whitechapel Bell Foundry in 1858, and popularly known as
Big Ben after Sir Bejamin Hall, the First Commissioner of Works at the time. Research Big Ben
A chronometer was any instrument that measures time, as a clock, watch, or dial; but, specifically, this term is applied to those time-keepers which were used for determining the longitude at sea, or for any other purpose where an accurate measure of time was required, with great portability in the instrument. The chronometer differed from the ordinary watch in the principle of its escapement, which was so constructed that the balance was free from the wheels during the greater part of its vibration, and also in being fitted with a compensation adjustment, calculated to prevent the expansion and contraction of the metal by the action of heat and cold from affecting its movements. Marine chronometers generally beat half-seconds, and were hung in gimbals in boxes 6 or 8 inches square. The pocket chronometer did not differ in appearance from a watch except that it was somewhat larger. Research Chronometer
A clock is an instrument for measuring time and indicating hours, minutes, and usually seconds, by means of hands moving on a dial-plate, and traditionally differing from a watch mainly in having the movement of its machinery regulated by a pendulum, and in not being portable. A clock also chimes, though the term clock is frequently, and incorrectly, applied to the non-chiming instruments for measuring time, which are technically known as a timepiece.
The use of a horologium, or hour-teller, was common even amongst the ancients, but their time-pieces were nothing else than sun-dials, hour-glasses, and clepsydrae. In the earlier half of our era we have accounts of several attempts at clock construction : that of Boethius in the 6th century, the clock sent by Harun al Rashid to Charlemagne in 809, that made by Pacificus, archdeacon of Verona, in the 9th century, and that of PopeSylvester II in the 10th century. It is doubtful, however, if any of these was a wheel-and-weight clock, and it is probably to the monks that we owe the invention of clocks set in motion by wheels and weights. In the 12th century clocks were made use of in the monasteries, which announced the end of every hour by the sound of a bell put in motion by means of wheels. From this time forward the expression, 'the clock has struck,' is often met with. The hand for marking the time is also made mention of.
In the 14th century there are stronger traces of the later system of clock-work. Dante particularly mentions clocks. Richard, abbot of St Albans in England, made a clock in 1326, such as had never been heard of until then. It not only indicated the course of the sun and moon, but also the ebb and flood tide. Large clocks on steeples likewise were first made use of in the 14th century. Watches are a much later invention, although they have likewise been said to have been invented as early as the 14th century. A celebrated clock, the construction of which is well known, was set up in Paris for Charles V in 1379, the maker being Henry de Vick, a German. It probably formed a model on which clocks were constructed for nearly 300 years, and until Huyghens applied the pendulum to clock-work as the regulating power, about 1657. The great advantage of the pendulum prior to the invention of electronic oscillators is that the beats or oscillations of a pendulum all occupy substantially the same time (the time depending on its length), hence its utility in imparting regularity to a time-measurer. The mechanism by which comparative regularity was previously attained, though ingenious and simple, was far less perfect; and the first pendulum escapement that is, the contrivance by which the pendulum was connected with the clock-work, was also less perfect than others subsequently introduced, especially Graham's dead-heat escapement, invented in 1700.
In a watch, prior to the invention of electronics, the balance-wheel and spring served the same purpose as the pendulum, and the honour of being the inventor of the balance-spring was contested between Huyghens and the English pliilosopher Dr. Hooke. Various improvements followed, such as the chronometerescapement, and the addition of a compensation adjustment, by which two metals having unequal rates of expansion and contraction under variations of temperature are combined in the pendulum or the balance-wheel, so that, each metal counteracting the other, the vibrations are isochronous under any change of temperature. This arrangement was perfected by Harrison in 1726, and was especially useful in navigation. Research Clock
Heliograph, or heliostat is the name given to various contrivances for reflecting the sun's light either temporarily or continuously to an observer at a distance. The simplest heliostat is a mirror hung up at a distant station so as to reflect a flash to the observer whose station may be many miles from it. This mirror is generally so adjusted that the flash occurs exactly at some prearranged hour, and by being in readiness the observer can get an observation with precision as regards time. Some heliostats are visible for 80 miles. By being fitted with an adjustment of clock-work, the mirror can be made to revolve with the sun, and so to reflect a beam of sunlight steadily in one direction, being then called also heliotrope. The heliostat has been used for signalling in war. Research Heliograph
A sundial or dial is an instrument for showing the hour of the day from the shadow thrown while the sun is shining by a stile or gnomon upon a graduated surface. The sundial has been known from the earliest times amongst Egyptians, Chaldeans, and Hebrews. From those eastern nations it came to the Greeks. It was introduced into Rome during the first Punic war.
Sundials are of various construction, horizontal, inclined, or upright, the principle in every case being to show the sun's distance from the meridian by means of the shadow cast by the stile or gnomon. The stile is made parallel with the earth's axis,and may be considered as coinciding with the axis of the diurnal rotation. Consequently as the sun moves westwards the shadow of the stile moves round in the opposite direction, falling on the meridian lines so marked as to represent the hours of the day. The sundial of course gives solar time, which, except on four days of the year, is slightly different from that of a well-regulated clock. Since at least 1900 sundials have been rather articles of curiosity or ornament than of use. Research Sundial
A timepiece is an instrument used for measuring time. A timepiece differs from a 'clock' in that it doesn't chime, and from a 'watch' in that a timepiece is designed to be stationary, perhaps mounted on a wall or sitting on a desk, though clocks and watches are specific forms of timepiece. The clepsydra as introduced to the Romans from the east around 158 BC by Seipio Nasica, and around 140 BC Ctesibius applied toothed wheels to them. Caesar reportedly discovered timepieces in Britain when he invaded in 55 BC. Alfred The Great of England used wax tapers as timepieces. The pendulum was applied to timepieces by Galileo around 1639, and in England the first pendulum timepiece was erected at St Paul's in Covent Garden by Richard Harris in 1641. Repeating timepieces were invented by Barlow in 1676, and the spiral pendulum spring by Robert Hooke in 1658. In 1905 the first timepiece actuated by radium was constructed. Research Timepiece
The laughing jackass or settler's clock (Dacelo gigas) is a large Australian kingfisher so called from its peculiar gurgling cry. Research Laughing Jackass
Charles Dickens was a 19th century English novelist whose powerful imagery brought to public attention the terrible conditions endured by the poor. He was born in 1812 at Landport, Portsmouth and died in 1870.
His father, John Dickens, was then in the employment of the Navy Pay Department, but subsequently became a newspaper reporter in London. Young Charles Dickens received a somewhat scanty education, was for a time a mere drudge in a blacking warehouse, and subsequently a clerk in an attorney's office. Having perfected himself in shorthand, however, he became a newspapercritic and reporter, was engaged on the Mirror of Parliament and the True Sun, and in 1835 on the Morning Chronicle. For some time previously he had been contributing humorous pieces to the Monthly Magazine; but at length, in 1835, appeared in the Morning Chronicle the first of that series of Sketches by Boz which brought Charles Dickens into fame. It was followed in quick succession by a pamphlet entitled Sunday under Three Heads, by Timothy Spark publsihed in 1836; the Tuggs of Barnsgate published in 1836; The Village Coquette, a comic opera published in 1836; and a farce called the Strange Gentleman published in 1836.
In the same year Chapman and Hall engaged the new writer to prepare the letterpress for a series of comic sketches on sporting subjects by Seymour, an artist who had already achieved fame, and suggested as a subject the adventures of an eccentric club. Seymourcommitted suicide soon after, and H K Browne joined Charles Dickens as illustrator, the result being the immortal Pickwick Papers.
The great characteristics of Charles Dickens' genius were now fully apparent, and his fame rose at once to the highest point it was possible for a writer of fiction to reach. A new class of characters, eccentric indeed, but vital representations of the humours and oddities of life, such as Mr. Pickwick, Sam Weller and his father, Mr. Winkle, and others, were made familiar to the public. Under the name of the Posthumous Papers of the Pickwick Club this work was published in two volumes in 1837.
In the same year Charles Dickens was engaged as editor of Bentley's Magazine, to which he contributed Oliver Twist, a work which opened up that vein of philanthropic pathos and indignant satire of institutions which became a distinguishing feature of his works. Before the completion of Oliver Twist, Nicholas Nickleby was begun, being issued complete in 1839. As the special object of Oliver Twist was to expose the conduct of workhouses, that of Nicholas Nickleby was to denounce the management of cheap boarding-schools.
Master Humphrey's Clock, issued in weekly numbers, contained among other matter two other leading tales, The Old Curiosity Shop, and Barnaby Rudge, the latter a historical tale, going back to the times of the Gordon riots. It was published complete in 1840-41. In 1841 Dickens visited America, and on his return he wrote American Notes for General Circulation published in 1842.
His next novel, Martin Chuzzlewit published in 1844, dwelt again on his American experiences. This work also added a number of typical figures - Mr. Pecksniff, Mark Tapley, Sarah Gamp, and others - to English literature. The series of Christmas Tales, in which a new element of his genius, the power of handling the wierd machinery of ghostly legend in subordination to his own peculiar humour, excited a new sensation of wonder and delight. These enumerated consecutively were: A Christmas Carol published in 1843, The Chimes published in 1844, The Cricket on the Hearth published in 1845), The Battle of Life published in 1846, The Haunted Man and the Ghost's Bargain published in 1847. The extraordinary popularity of these tales created for a time a new department in literature, that of the Sensational tale for the Christmas season.
In 1845 Charles Dickens went to Italy, and on his return the Daily News, started on the 1st of January, 1846, was intrusted to his editorial management; but, despite his early training, this was an occupation uncongenial to his mind, and in a few months the experiment was abandoned. His Pictures from Italy were published the same year. Next followed his novel of Dombey and Son published in 1848), and David Copperfield, a work which has a strong autobiographical element in it published in 1849-50.
In 1850 Charles Dickens became editor of the weekly serial Household Words, in which various original contributions from his own pen appeared. In 1853 his Bleak House came out. A Child's History of England, commenced in Household Words, was published in 1852-64. Hard Times appeared in Household Words, and was published in 1854. Little Dorrit, commenced in 1856, dealt with imprisonment for debt, the contrasts of character developed by wealth and poverty, and executive imbecility, idealized in the Circumlocution Office. In 1859, in consequence of a disagreement with his publishers, All the Year Round superseded Household Words; and in the first number of this periodical, 28th May, was begun A Tale of Two Cities. Great Expectations followed in the same paper, on the 1st of December, 1860. Both were soon. republished, and are generally considered as the poorest of Charles Dickens' works.
In All the Year Round also appeared a series of disconnected sketches, called the Uncommercial Traveller, published in 1868. Our Mutual Friend, completed in 1865, and published in the usual monthly numbers, with illustrations by Marcus Stone, was the last great serial work which Charles Dickens lived to finish. It contained some studies of characters of a breadth and depth unusual with Charles Dickens, and is distinguished among his works by its elaborate plot. The first number of his last work, The Mystery of Edwin Drood, was issued on the 1st of April, 1870, and only three numbers had appeared when he died somewhat suddenly, at his residence, Gad's Hill Place, near Rochester, on the 9th of June. He had considerably overtaxed his strength during his later years, more especially by his successive series of public readings from bis own works, one series being delivered in America in 1867-68. He was buried in Westminster Abbey.
Charles Dickens' work as a novelist is firmly based upon a wide and keen observation of men. It is true that most of his characters suffer from being created to exhibit little more than one trait or quality alone, and thus receive an air of grotesqueness and exaggeration which approaches caricature. But the single trait or quality which they embody is so truly conceived, and exhibited with such vitality and humour, as to place Charles Dickens, in spite of all that is grotesque and overstrained in his work, amongst the great artists. Research Charles Dickens
Christiaan Huygens was a Dutch mathematician and physicist. He was born in 1629 and died in 1695. He studied at Leyden, and at Breda, where he went through a course of civil law from 1646-48. He made several journeys to Denmark, France, and England; in 1666 settled at the invitation of Colbert in Paris, where he remained until 1681, when he returned to Holland on account of his health.
Among his most important contributions to science are his investigations on the oscillations of the pendulum - he invented the pendulum clock, and his System of Saturn, in which he first proved that the ring completely surrounds the planet, and determined the inclination of its plane to that of the ecliptic. In 1690 he published important treatises on light and on weight. His Traite de la Lumiere was founded on the undulation theory, but in consequence of the prevalence of the Newtonian theory it was long neglected until later researches established its credit. Research Christiaan Huygens
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Abbreviations
Research Big Ben
