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Catalog of 400 Day Torsion Clock Pendulums

This article is intended to provide a catalog of 400 day clock pendulums to fill in some of the omissions in the Horolovar Repair Guide and other references. It will attempt cover as many of the different variations from each manufacturer as examples have been discovered. Pictures and descriptions of each pendulum's characterisics will be provided along with the known histories.

The information provided will be arranged chonologicly by manufacturer as much as possible.

This is a work in progress. Hopefully this catalog will be expanded as additional information becomes available.














Jahresuhren-Fabrik (GW & Cie, JUF, et al.) Disk Pendulums

This is the first basic disk pendulum used by GW & Cie and later JUF with Harder patent 400 day clocks. The Horolovar Repair Guide shows it as #2. The large disk is turned from solid brass. The pendulum is fixed to the bottom suspension block by a loose pin. c1882



This is the first style of disk pendulum with an added decorative gallery used by JUF. The Horolovar Repair Guide shows it as # 3. The three columns are made from steel. The added gallery required taller support columns for the movements. Like the basic disk, this was made from turned brass and attached to the suspension by a loose pin. This pendulum is sometimes found with striking clocks. c1885-c1890



This is the second style of disk pendulum with an added decorative gallery used by JUF. The six smooth columns are made of nickel plated brass. This disk is found mostly with striking clocks, but some have been found on standard clocks as well. C1885.



This is the 3rd version disk pendulum with a gallery used by JUF. The Horolovar Repair Guide shows it as #21. This pendulum replaced the 3 column gallery and was used with (almost) all JUF and Huber sold JUF clocks until JUF resumed numbering their movements (c1890-c1906). Early versions of this pendulum used brass for the large disk. Later used a brass shell over an iron core. Later versions had the top hanger notched to form a hook. These pendulums are often found with extra weights attached on the bottom. The meaning of the numbers found on some of these disks has not been determined.


Various disk weights found with pendulum #21.



This pendulum replaced #21 when JUF resumed numbering their movements (at serial number 50000) and until they changed to offering ball pendulums (around number 117000). Three variants of were used at different times and are distinguishable only by examining the bottom cover plate. The large disk is a brass shell over a steel or iron core with a formed bottom cover. The bottoms were usually marked in ink with the serial number of their associated movement. This the second most common pendulum used by JUF, and is not shown in the Horolovar guide.


Here are the bottoms of the three variants and the approximate number range for each.


All three variants were available with a spiral extension below the hook for tall clock models.



This is a small diameter but taller disk used with 4-glass clocks or other decorative cased clocks where the larger disk would not fit. Use of this disk started around serial number 80000 until around 112000. This pendulum is not in the Horolovar guide.



It was also available with the spiral hook extension.


Another small diameter and taller disk was used starting around serial number 120000 until 147000. It apears as though there was a renewed desire for some clocks with disk pendulums. It is basically the same at the previous pendulum but with a different bottom cover. It was the last disk pendulum style used by JUF. This pendulum is not in the Horolovar guide.

Jahresuhren-Fabrik, Schatz Ball Pendulums

This is the first version ball pendulum by JUF, known as the arrow pendulum for the shape of the rating levers on its bottom.






Gustav Becker

This is the first disk pendulum used by Becker with their cylinder escapement clocks, c1872. The large disk is made from a circular brass plate fixed to a brass ring with two screws. The adjusting weights are marked "N V" rather than "R A" or "S F". This design was later used with Harder clocks made by JUF. This pendulum is not in the repair guide.


This is the third (or fourth) variant of pendulum 23 from the repair guide. The gallery and adjusting weights are nearly identical to the previous version, with the one noticeable change being the addition of a beveled washer at the base of the central column. The main disk is now a composite consisting of a thin top plate with a beveled and ribbed edge over a pressed brass pan containing a lead ring. This variant was used up to S/N 2078081 and discontinued before S/N 2080000.

Bottom view. Later versions use a similar bottom pan to this one but with steel hardware.


This is the fourth variant of pendulum 23. It is obviously a reduced cost part from the previous version. The gallery screws are gone, the disks are much thinner, and the center finial is now straight. The beveled washer at the bottom of the center column is now a plain washer. The main disk is now a thin brass shell spun over a steel core. The bottom pan and lead ring are the same as the previous version, but the pan now slips into the upper shell. This variant was used up to S/N 2443000. During it's first use period the adjusting screw was changed from the stepped shank show to a straight screw. Use of this variant alternated with the next.


The bottom is similar to the previous version but with steel hardware. The edge where the bottom pan fits into the upper shell is clearly visible.

Philipp Hauck

Wilhelm Würth

Kronen Dreh Pendel or Crown pendulum used from the begining of Würth's production period until around serial number 13000 when it was replaced by a pendulum with a six pillar gallery. This is #20 in the repair guide. The adjusting disks on many Würth pendulums are each marked with both R A (A R) and S F (F S). Most early production Würth clocks had either this pendulum or the Louis Wiley compensating pendulum (#7 in the repair guide).


The Crown pendulum came with a pressed in bottom cover either plain metal or brass plated and stamped with "D.R.G.M." and the serial number of its associated movement.



Internally adjusted or rotary disk pendulum. This pendulum is described by DRGMs 257636 dated Jul 1905 and 270879 dated Jan 1906. There were two versions of this pendulum, the one with straight sides as shown here, and one with a deep, wide groove in the center of the side extending around the disk circumference. Regulation is controled by holding the disk and turning the bottom cover by the knurled edge, and is indicated on both pointers in unison. This is a rare one. All clocks discovered with this pendulum are from within a year of the DRGM dates. This disk is not shown in the repair guide.

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