Glossary
104
Tompion, Thomas
(1638-1713)
Torque
Transmission
Transmission ratio
Tripping, galopping
Tungsten
Unbalance
Verge
escapement
Weight-spring system
Wheel
Winding period
English watchmaker who is known as the inventor of the Cylinder
escapement
*
, the first frictional-rest escapement
*
for portable timepieces.
This was improved more by Tompion’s apprentice, friend, and later business
partner George Graham
*
. Tompion
*
made one of the first pocket watches
outfitted with a balance spring.
The product of energy and a lever arm.
The passing of torque
*
while meshing
*
. The rotational direction and number
of revolutions change from one arbor to the next.
This describes the transmission
*
of a pair of meshing
*
wheels and is
calculated from the number of teeth of the wheel
*
and pinion
*
. The trans-
mission ratio shows how often the pinion
*
rotates in comparison to that of
the wheel.
Accidental passage of several escape wheel
*
teeth rather than just one.
It usually occurs after shock to a chronometer or Duplex escapement
*
.
A very heavy metal. Density: 19.3 g/cm3.
State
*
of a revolving part (such as the balance) when its center of gravity is
not situated on the rotational axis.
First mechanical escapement for clocks. It contained a foliot
*
placed on a
verge.
A mechanical oscillation system whose frequency is determined by the
cyclical change between dynamic energy (motion of a weight) and static
energy (positional energy of the pendulum
*
or elasticity of the balance
spring).
In watchmaking high gear ratios are used. The larger gear wheel
*
is usually
just called the »wheel
*
« and the smaller gear is known as the pinion
*
.
The time a fully wound timepiece will run without rewinding. The Winding
period
*
depends on the gear ratios used and the mainspring
*
.
W
V
U
This rate table serves to help monitor the rate precision of your M2.
Additionally, the written records will be very helpful to you during
regulation
*
. It makes sense to note the precise position of the index
*
on the index scale.
Rate Table
as a Template
Rate
24 h
Difference between states
Time difference
x 24
=
When regulating
*
, complete this carefully and move the index only
in very small steps.
Otherwise the changes could become very extreme. After every
correction, observe the rate of your table clock throughout the
entirety of the winding period
*
of one week since the rate
*
of a
mainspring-driven clock can compensate itself within a week.
A commercially available radio-controlled clock is fully sufficient as
a reference clock. With a little practice you will soon be able to
recognize differences on both clocks of less than 0.5 seconds with
the naked eye.
Formula for Calculating Rate
