ROSE GOLD ANTIQUE QUARTER HOUR REPEATER KEYWIND POCKET WATCH C1800 | BRANDT, JEANRENAUD & ROBERT, 1
ANTIQUE-GOLD-POCKET-WATCH-SP62019-16-AI
Product Details
18K Rose Gold Brandt, Jeanrenaud & Robert 57mm Pocket Watch
Swiss; Brandt, Jeanrenaud & Robert; Mans; C. 1800
Complications: ¼ hour repeater and alarm.
CASE: The 18K rose gold, 57mm, plain polished, swing-out case has an open
face.
DIAL: This white porcelain dial displays Arabic numerals and fancy hands.
MOVT: This 4-jewel, key-set movement with cylinder escapement is gilt
with a full plate layout and is signed.
CONDITIONS:
C 3 (The case is in
very good condition)
D 2 (The dial is in
perfect condition)
M 3
(The movement is in very good condition)
Quarter Hour Repeater
The quarter repeater strikes the number of hours, and then the number of quarter
hours since the last hour. The mechanism uses 2 chimes of different tones. The
low tone usually signals the hours, and the high tone the quarter hours. As an
example, if the time is 2:45, the quarter repeater sounds 2 low tones and after
a short pause 3 high ones: "dong, dong, ding, ding, ding". Alternatively, some
use a pair of tones to distinguish the quarter hours: "dong, dong, ding-dong,
ding-dong, ding-dong"
Key-wind/Key-set Movements
The very first pocket watches up until the third quarter of the 19th century had
key-wind and key-set movements. A watch key was necessary to wind the watch and
to set the time. This was usually done by opening the case back and putting the
key over the winding-arbor (which was set over the watch's winding-wheel, to
wind the mainspring) or by putting the key onto the setting-arbor, which was
connected with the minute-wheel and turned the hands. Some watches of this
period had the setting-arbor at the front of the watch, so that removing the
crystal and bezel was necessary to set the time.
This watch includes a reproduction of the correct size key, it is not the
original.
Cylinder escapement
The horizontal or cylinder escapement replaced
the verge escapement was much thinner than the verge, allowing watches to be
made thinner.
Clockmakers found it suffered from excessive wear, so it was not much used
during the 18th century, except in a few high-end watches with the cylinders
made from ruby.
The French solved this problem by making the cylinder
and escape wheel of hardened steel and the escapement was used in large numbers
in inexpensive French and Swiss pocket watches and small clocks from the
mid-19th to the 20th century.
Instead of pallets, the escapement uses a cutaway cylinder on the balance wheel
shaft, which the escape teeth enter one by one.
Each wedge-shaped tooth impulses the balance wheel by
pressure on the cylinder edge as it enters, is held inside the cylinder as it
turns, and impulses the wheel again as it leaves out the other side.
The wheel usually had 15 teeth, and impulsed the balance over an angle of 20° to
40° in each direction. It is a frictional rest escapement, with the teeth in
contact with the cylinder over the whole balance wheel cycle.