OPERATION
The barrel, which contains a classic spring, is
connected by a chain to a component called a fusee
which transmits energy to the movement. When the
watch is running, the chain winds around the body
of the barrel and unwinds from the fusee following
a characteristic curve.
When the spring force decreases, the diameter
over which the chain is unwinding increases
proportionally on the fusee. This is the lever
principle: a high force on a small arm is equal to a
low force on a large arm. The shape of the fusee is
calculated point by point for a defined spring curve
and can only apply to it. The complexity of this
principle lies in miniaturising all the components to
fit inside a wristwatch. The chain is the best means
by which to transmit the barrel force to the fusee.
The 575 chain components, which are meticulously
constructed, are assembled on a riveted spindle to
ensure the chain operates smoothly.
5 5
Summary of Contents for EL PRIMERO series
Page 1: ...OPER ATING INSTRUC TIONS...
Page 4: ...ZENITH THE FUTURE OF SWISS WATCHMAKING SINCE 1865...
Page 10: ...EL PRIMERO...
Page 23: ...ELITE...
Page 31: ...EL PRIMERO 21...
Page 43: ...ZENITH OSCILL ATOR CALIBRE 9100...
Page 49: ...HAUTE HORLOGERIE...
Page 67: ...COMPLICATIONS...
Page 68: ...EL PRIMERO...
Page 81: ...ELITE...