Turret clock


A turret clock or tower clock is a clock designed to be mounted high in the wall of a building, usually in a clock tower, in public buildings such as churches, university buildings, and town halls. As a public amenity to enable the community to tell the time, it has a large face visible from far away, and often a striking mechanism which rings bells upon the hours.
Although the term 'turret clock' was not used by clockmakers until recent times, it is one of the earliest types of clock. Beginning in 12th century Europe, towns and monasteries built clocks in high towers to strike bells to call the community to prayer. Public clocks played an important timekeeping role in daily life until the 20th century, when accurate watches became cheap enough for ordinary people to afford. Today the time-disseminating functions of turret clocks are not much needed, and they are mainly built and preserved for traditional, decorative, and artistic reasons.
To turn the large hands and run the striking train, the mechanism of turret clocks must be more powerful than that of ordinary clocks. Traditional turret clocks are large pendulum clocks run by hanging weights, but modern ones are often run by electricity.

History

Water clocks

s are reported as early as 4000 B.C. and were used in the ancient world, but these were domestic clocks. Beginning in the Middle Ages around 1000 A.D. striking water clocks were invented, which rang bells on the canonical hours for the purpose of calling the community to prayer. Installed in clock towers in cathedrals, monasteries and town squares so they could be heard at long distances, these were the first turret clocks. By the 13th century towns in Europe competed with each other to build the most elaborate, beautiful clocks. Water clocks kept time by the rate of water flowing through an orifice. Since the rate of flow varies with pressure which is proportional to the height of water in the source container, and viscosity which varies with temperature during the day, water clocks had limited accuracy. Other disadvantages were that they required a continual supply of water to be manually hauled from a well, and froze solid in winter.

Verge and foliot clocks

The first all-mechanical clocks which emerged in the late 13th century kept time with a verge escapement and foliot. In the second half of the 14th century, over 500 striking turret clocks were installed in public buildings all over Europe. This was the first time public clocks became easy to maintain, as water clocks needed more or less constant attention, so only wealthy institutions with enough manpower could maintain them. The verge and foliot mechanical clocks were relatively easy to maintain and so found their way into many churches, bell towers and town halls. This new technology spread quite fast.

Pendulum clocks

The fourth generation of clocks were mechanical clocks with a pendulum, which was invented in 1657 by Christiaan Huygens. As the pendulum was more exact than the foliot, some foliot clocks were converted to pendulum. Again, this new technology was adopted quickly throughout Europe, with many clocks being converted.

Electrical clocks

Electric turret clocks and hybrid mechanical/electric clocks were introduced in the late 19th century.
Some mechanical turret clocks are wound by electric motor. These still are considered mechanical clocks.

Table of early public turret clocks

This table shows some of the turret clocks which were installed throughout Europe. It is not complete and mainly serves to illustrate the rate of adoption. There are hardly any surviving turret clock mechanisms that date before 1400, and because of extensive rebuilding of clocks the authenticity of those that do survive is disputed. What little is known of their mechanisms is mostly gleaned from manuscript sources.
The "country" column refers to the present international boundaries. For example, Colmar was in Germany in 1370, but is now in France.

Thirteenth century

The verge and foliot escapement is thought to have been introduced sometime at the end of the thirteenth century, so very few if any of these clocks had foliot mechanisms; most were water clocks or in a few cases, possibly mercury.
YearCountryPlaceLocationNameTypeMentionComment
1283EnglandDunstablePrioryhorologiumnot knownAnnals of the priory 1283 – Eodem anno fecimus horologium quod est supra pulpitum collocatum.Probably a verge and foliot clock because it was mounted over the rood screen, where refilling a water clock would have been difficult, it has been proposed as the earliest known mechanical clock.
1284EnglandExeterCathedralExeter cathedral clocknot knowngrant made July 1284 to Roger de Ropford, bellfounder, to repair "orologium"It is unlikely that this 1284 clock was a verge and foliot clock. The clock mentioned in the grant was probably a water clock. In 1423, a new clock was installed, which is probably the one from which remnants of the striking train can still be seen.
1286EnglandLondonSt Paul's CathedralBartholomo Orologiario clocknot knownCompotus Bracini 1286probably a water clock
1288 EnglandOxfordMerton Collegenot knownbursarial accounts "Expense orologii"probably a water clock
1290EnglandNorwichNorwich Cathedralnot knownSacrist's roll 1290 "In emendacione orologio"probably a water clock
1291EnglandElyEly Abbeynot knownSacrist's roll 1291 "pro custodia orologii"probably a water clock
1292EnglandCanterburyChristchurch cathedralnovum orolgiumnot knownlist of Prior Henry of Eastry's works "novum orologium mangum in Ecclesia"probably a water clock

Fourteenth century

During the fourteenth century, the emergence of the foliot replaced the high-maintenance water clocks. It is not known when that happened exactly and which of the early 14th century clocks were water clocks and which ones use a foliot.
The Heinrich von Wieck clock in Paris dating from 1362 is the first clock of which it is known with certainty that it had a foliot and a verge escapement. The fact that there is a sudden increase in the number of recorded turret clock installations points to the fact that these new clocks use verge & foliot. This happens in the years 1350 and onwards.
YearCountryPlaceLocationNameTypeMentionComment
1304GermanyErfurtBenedict abbey St. Peter"Schelle"not knownconsecration of "Petronella" and "Scolastica"probably a mechanical alarm clock
1305GermanyAugsburgcathedralnot knownthe "Domkustos" E. v. Nidlingen donates to the cathedral a "good and well adjusted clock"probably a mechanical alarm clock
1306EnglandSalisburySalisbury cathedralnot knowncomposition concluded 26/8/1306 "Before the clock of the cathedral had struck one no person was to purchase or cause to be purchased....probably a water clock
1308FranceCambraiCathedralnot knownmention of a clock, which was mended and equipped with moving figures in 1348, and fitted with a strike and an angel in 1398
1309ItalyMilanchurch St. Eustorgionot knownmention of a metal clock, which was repaired in 1333 and 1555
1314FranceCaenchurch St. Pierrenot knownmention of a striking clock
1316PolandBrzegtown hallnot knownweights of the clock still present. New bell cast for clock 1370, replaced by new clock 1414
1322EnglandNorwichNorwich cathedral prioryNorwich cathedral astronomical clockastronomical clockSacrist's roll of Norwich cathedral of 1322 to 1325 mentions the construction and installation of a clock which had a large astronomical dial and automata including 59 images and a choir or procession of monksearliest detailed account of the organisation and of the craftsmen and materials involved in such a project
1325–43FranceClunycollegiate churchnot knownPetrus de Chastelux builds a new clock
1327EnglandSt AlbansSt Albans Cathedralastronomical clockdrawingsEarliest clock for which there is detailed description of the escapement, this had a 'strob' escapement, a variation of a verge and foliot with two escape wheels.
1336ItalyMilantownpublic striking clock with 24-hour dialAnnales Mediolanenses AnonymiAccording to Bilfinger, this is the first mechanical striking clock and could have been made by de Dondi. This is the first time a clock is mentioned that strikes consecutive hours, e.g. once at 1, twice at two, etc. and that strikes day and night. As there are detailed descriptions of what the clock does, it was considered a novelty. Another candidate for the first mechanical clock.
1348–64ItalyPaduaCastle TowerAstrariumastronomical clock with strike, verge and crown balance wheelIl Tractatus AstariiGiovanni de Dondi
1351EnglandWindsor castleGreat Towermade in London by three Lombards who arrived 8/4/1352 and left on 24/5/1352-
1351ItalyOrvietoclock tower next to the cathedralstriking clock with jacquemart
1352–54FranceStrasbourgcathedralastronomical clock. Three dials: bottom year dial with saint days, middle hour dial, top hourly procession of 3 kings before Maria, at the top a crowing rooster.taken out of service in 1547
1353ItalyGenovastriking clock
1354ItalyFlorencePalazzo Vecchio
1355–71ItalyReggiostriking clock
1356ItalyBolognacastle towerstriking clock
1356–61GermanyNurembergFrauenkirchestriking clock with display of the prince-electors around the Kaisersubstituted in 1508/09 with the clock on the outside of the Frauenkirche
1359GermanyFrankenbergPfarrkircheastronomical clock with the three kings around the Virgin Mary
1359ItalySiennacity towerBartolo Giordi mounts a clock on the city tower
1361GermanyFrankfurtcathedralastronomical clockmade by Jacob, improved 1383, taken out of service 1605
1361GermanyMunichcity towermention of existing clock
1362BelgiumBrusselsSt Nicholas churchnot knownmention of a turret clock
1362ItalyFerraracastle towerclock mounted on castle tower
1362–70FranceParisTour de l'Horlogeverge and foliot striking clockFroissart's poem "L'Horloge amoureuse" mentions the clock. Drawing exists.a drawing of the going train shows a door frame construction. Built by the German Heinrich von Wiek.
1364GermanyAugsburgPerlachturmstriking clockclock was repaired in 1369 and a quarter strike was added in 1526
1365–67EnglandLondonWestminster Palacenot knowna clock tower on the north wall at the end of the King's Garden opposite the entrance to the great hall was begun in 1365 and finished in 1367.
1366SpainToledocathedralgoldsmith Gonzalo Perez supplies a clock for the tower of the cathedral
1366–68SwitzerlandZurichPetersturmstriking clockMaster Chunrad von Cloten builds a striking clock for the Petersturm
1366EnglandKentQueenborough Castlestriking clock
1367PolandWroclawtown hallmention of existing town hall clock
1368EnglandKings LangleyKings Langley Manorstriking clockEdward III provided a patent giving safe conduct to three Flemish clockmakers. These people probably built the clock.after the expiry of the patent in 1369 John Lincoln was appointed as Royal clock keeper.
1368PolandOpavaTown council signs contract with master Swelbel to furnish a clock
1369GermanyMainzPfarrkirche St. Quentinstriking clock
1370FranceColmarcathedral towerstriking clock
1370PolandSwidnicathe town council engages the services of master Swelbel to furnish a clock, that is as good or better than the clock at Wroclaw.
1371EnglandYorkYork Minsterstriking clockFabric Rolls of York Minster record purchase of a new clock made by John Clareburgh in 1371 or £13 6s. 8d.
1372BelgiumGolzinnecastlestriking clockLouis Defiens furnishes a striking clock for the castle
1372–73FranceStrasbourgcathedralstriking clockHeinrich Halder mounts a striking clock on the cathedral tower
1376BelgiumGhentBelfriedstriking clock
1376FranceSensa clock with several bells is manufactured
1376FranceBeauté-sur-MarnecastlePierre de S. Béate furnishes a clock for the castle
1377BelgiumDendermondebelfryJan van Delft manufactures a clock for the belfry
1377FranceValenciennestown hallthe town hall clock is replaced and fitted with 2 striking figures
1377ItalyVicenzatown hallstriking clockMaster Facius Pisanus manufactures a new striking clock for the town hall
1377BelgiumYpresbelfrystriking clock with several bells
1380GermanyBambergcathedralclock installed at the cathedral
1380FranceNieppecastlePierre Daimville engaged to furnish a metal clock weighing 300 pounds for the castle, which already has an existing clock
1382–84GermanyHamburgNikolaikirchestriking clockBlacksmith Schinkel furnishes a public striking clock for the Nikolaikirche
1383–84FranceDijonNotre-Damestriking clockthe clock taken from Courtrai in Belgium in 1382 is mounted on the tower of Notre-Dame
1383GermanyFritzlarmention of a turret clock
1383FranceLyoneglise St. Jeanstriking clockmention of a small striking clock at St. Jean
1384GermanyFriedbergstriking clockWernher von Ilbenstedt manufactures a striking clock
1384GermanyMindencathedralmention of the cathedral clock being repaired
1385SwitzerlandLuzernGraggenturmstriking clockBlacksmith H. Halder furnishes a striking clock for the Graggenturm and leaves a manual for the treatment of the clockThe operating instructions for this clock were written down, and clearly refer to a verge and foliot clock. the "frowen gemuete " is the foliot.
1386GermanyBraunschweigKatharinenkircheMarquard furnishes a clock for the Katharinenkirche. The cathedral already had a clock in 1346
1386EnglandSalisburySalisbury CathedralSalisbury Cathedral clockStriking ClockDeedmight not be the clock on display at the cathedral
1386GermanyWürzburgcathedralclock at the cathedral mentioned
1388FranceBéthunebelfrystriking clockThe citizens of Bethune want to re-construct the existing belfry and put up a clock. "... pour pouvoir reconstruire leur beffroi
qui etait a present moult demolis et venus k ruyne et en peril de keir de jour en jour et en obtenir l'autorisation d'y placer une orloge pour memore des heures de jour et de nuit sicomme il est en pluseurs autres lieux et bonnes villes du paus environ".
We have a reference here on how common turret clocks have become – they refer to " a clock to remind of the hours of the day and the night as it is now common in other places and good towns...". This is also a reference that shows that turret clocks struck the time day and night.
1388GermanyMagdeburgCathedralstriking clockmention of a striking clock at the cathedral
1389FranceRouenbelfrystriking clock with quarter strikeJehan de Felains paid 70 Livres for a clock with a quarter strike for the belfry
1391FranceMetzcathedralstriking clock with quarter strikeManufactured by Heinrich von Wieck
1392FranceChartresstriking clockclockmaker and blacksmith Philibert Mauvoisin instructed to make a striking clock resembling the one at the Paris castle
1392GermanyHanovermarket churchblacksmiths Meistorpe and Hans Krieten furnish a clock for the market church
1392–93EnglandWellsWells Cathedralstriking clockif this is the clock now shown at the British Museum in London is questionable
1394GermanyStralsundNikolaikircheastronomical clockNikolaus Lilienfeld furnishes a clock for the Nikolaikirche
1395GermanyDoberanchurchastronomical clockan astronomical clock similar to the one in Stralsund is put up at the church
1395GermanySpeyerAltburgtorstriking clocka striking clock is reported at the Altburgtor and at the Predigerkirche
1398–1401GermanyVillingenastronomical clockMaster Claus Gutsch manufactures an astronomical clock after the Strasbourg clock.

It becomes apparent that even small towns can afford to put up public striking clocks. Turret clocks are now common throughout Europe.
No surviving clock mechanisms is known from this era.