Small spring-loaded clock with pendulum oscillator beating half seconds, with brass escape wheel, anchor-type escapement with steel pawl. The dial, with a diameter of 10 cm in silver-plated brass, is divided into minutes shown on the outer margin, the hours in Roman numerals are shown inside, in an eccentric position, in the upper part, a small dial with a diameter of 3 cm shows the seconds scored ten by ten. The oscillation period of the pendulum can be adjusted by unscrewing or screwing a ring nut positioned on the rod which determines the displacement of the burnished metal lens along the suspension rod. The electrical contacts with which this pendulum is equipped were used to electrically synchronize other pendulums and record the whole seconds on the chronograph. The cabinet containing the instrument is made of walnut wood.