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
A collective noun (or collective name) is a name which denotes or represents a number of individual items. For example, a number of sheep together is known as a 'flock'. The word 'flock' is the collective noun for a number of sheep. Some items have multiple collective nouns, for example a collection of goats can be known as a 'herd', a 'tribe' or a 'trip'.
Ambush is the collective noun for a group of tigers.
Army is the collective noun for a group of frogs, ants,
Array is the collective noun for a group of hedgehogs.
Badelynge is the collective noun for a group of ducks on the ground.
Bale is the collective noun for a group of turtles.
Barren is the collective noun for a group of mules.
Basket is the collective noun for a group of plums.
Battery is the collective noun for a group of barracuda.
Bazaar is the collective noun for a group of guillemots.
Bed is the collective noun for a group of clams.
Bench is the collective noun for a group of bishops, magistrates.
Bevy is the collective noun for a group of quail, roes, swans, pheasants, ladies.
Brace is the collective noun for a group of bucks.
Brood is the collective noun for a group of chickens.
Building is the collective noun for a group of rooks.
Bunch is the collective noun for a group of grapes, flowers.
Bundle is the collective noun for a group of asparagus.
Business is the collective noun for a group of ferrets.
Caravan is the collective noun for a group of camels.
Cast is the collective noun for a group of hawks, falcons.
Cete is the collective noun for a group of badgers.
Charm is the collective noun for a group of goldfinches.
Chatter is the collective noun for a group of budgerigars.
Chattering is the collective noun for a group of choughs.
Chine is the collective noun for a group of polecats.
Clamour is the collective noun for a group of rooks.
Clous is the collective noun for a group of gnats.
Clowder is the collective noun for a group of cats.
Clump is the collective noun for a group of trees.
Cluster is the collective noun for a group of grapes, spiders.
Clutch is the collective noun for a group of eggs.
Clutter is the collective noun for a group of spiders.
Colony is the collective noun for a group of gulls, frogs, penguins, ants, beavers.
Company is the collective noun for a group of widgeon, parrots.
Congregation is the collective noun for a group of plovers.
Convocation is the collective noun for a group of eagles.
Covert is the collective noun for a group of coots.
Covey is the collective noun for a group of partridges, grouse.
Crash is the collective noun for a group of rhinoceros.
A Neighbourhood Watch is a local crime-prevention scheme. Under the supervision of police, groups of residents agree to increase watchfulness in order to prevent crimes such as burglary and vandalism in their area. The first such group in the UK was started in Cheshire in 1982 following a US model. By 1990 there were an estimated 74,000 groups. Research Neighbourhood Watch
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
In horology, a verge is the spindle of a watchbalance, especially one with pallets, as in the old vertical escapement. In horticulture a verge is the edge or outside of a bed or border. The term is also applied to a slip of grass adjoining gravel walks, and dividing them from the borders in a parterre. Research Verge
Wacht am Rhein (Watch on the Rhine) is a German national song written in 1840 by Max Schneckenburger and composed in its popular form in 1854 by Karl Wilhelm. It was the battle-song of the German army in 1870 to 1871. Research Wacht am Rhein
Watch night is a religious service held on New Years Eve until after midnight. The practice was started by Methodists during the 18th century. Research Watch Night
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
Abbreviations
Research Chronometer
