And I explain what the title means:
Mechanical watches get their power from a spring which is initially fully
compressed (by winding) and then expanded in a very controlled way.
The amount of stored mechanical energy is determined by the physical
properties of the spring and is fixed.
The rate of releasing the energy is also determined by the various gears and
resonant devices the manufacturer installs in order to achieve the required
accuracy.
Having said that one can conclude that the time from full compression to
complete release is also fixed, namely 40-48h usually.
My question refers to chronographs and is the following: Will the power
reserve of a chronograph (in hours) decrease when the chronograph function is
engaged, and why?