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Wall clock by Johannes Ruf, 1701–1800 — view 1 of 5
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Clocks · Wall clock

Wall clock by Johannes Ruf, 1701–1800

DocumentedDocumented from the holding institution's catalogue record.
Maker / attribution
Johannes Ruf (Maker)
Date
1701–1800
Historical period
Early Modern Horology (1600 – 1750)
Country of origin
Unrecorded in source
Object type
Wall clock
Dimensions
Höhe: 29.00 cm, Breite: 21.50 cm, Tiefe: 13.00 cm
Holding institution
German Clock Museum
Accession / object no.
2012-187 (inventory number) 32000 (technical number)
Credit line
German Clock Museum
Catalogue title (original)
Wanduhr, Johannes Ruf, "danheim Am berg"(?), 18. Jahrhundert (German)

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Record summary

Held and catalogued by German Clock Museum (object number 2012-187 (inventory number) 32000 (technical number)), this is a wall clock by Johannes Ruf, dated 1701–1800. The Atlas places it in the Early Modern Horology period (1600 – 1750) of its Clocks collection. Recorded dimensions: Höhe: 29.00 cm, Breite: 21.50 cm, Tiefe: 13.00 cm. The record is illustrated with 5 photographs.

Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.

Catalogue description

Catalogue description from German Clock Museum

Wanduhr mit Vorderpendel, Johannes Ruf, "danheim Am berg"(?), 18. Jahrhundert (Deutsches Uhrenmuseum Furtwangen)

Shown in the original language of the source catalogue. An editor-reviewed English translation has not yet been published; we do not publish machine translations as authoritative text.

Historical context

Early Modern Horology (1600 – 1750)

Huygens' pendulum and balance spring transform accuracy; English makers develop the anchor and deadbeat escapements.

Huygens's pendulum (1656–57) improved clock accuracy from about a quarter of an hour to under a minute a day. The anchor escapement (c. 1670) and the long seconds pendulum created the longcase clock; London makers such as Fromanteel, Knibb, Tompion and Quare led European clockmaking, and French makers created the Boulle pendule.

Read the period in the timelineMore clocks from this periodEarlier: Renaissance Horology

Atlas type guide

Regulators, wall and Vienna clocks

A regulator is a precision pendulum clock used as a time standard in observatories, workshops and railway offices. Typical features are a deadbeat or Graham escapement, a temperature-compensated pendulum (mercury jar, gridiron or later invar), maintaining power and a regulator dial that separates hours, minutes and seconds. George Graham's deadbeat escapement (c. 1715) and his mercury pendulum, together with Harrison's gridiron, set the pattern for two centuries.

Wall clocks span a much wider range: the elegant Viennese Laterndluhr and Dachluhr of the Biedermeier period, the Dutch stoelklok and staartklok, English 'dial' clocks used in schools, offices and railway stations, and mass-produced spring and weight wall clocks from Germany (Gustav Becker, Junghans, Kienzle) and America.

What to look for

  • Deadbeat escapement and compensated pendulum (gridiron rods, mercury jar or wood rod).
  • A regulator dial with a large central minute hand and separate hour and seconds dials.
  • Vienna regulators: glazed cases, slender pendulum, small weights, enamel two-piece dials.
  • German factory trademarks stamped on the backplate (e.g. Gustav Becker anchor and crown, Junghans star).

Dating clues

  • Graham-type deadbeat regulators: from c. 1720.
  • Viennese Laterndluhr: c. 1800–1850.
  • German factory 'Vienna-style' regulators: c. 1870–1930; Gustav Becker serial numbers allow close dating.

General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.

Read next:Deadbeat escapementAnchor (recoil) escapementGrasshopper escapement

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