The immense power of even this smallest 'WT' enables it to drive the hands of up to four 6' (2metre) diameter external dials in all weathers. The power comes from the two large electromagnets controlled by the Hipp Toggle & V-block. When the pendulum grows tired of driving the heavy hands on the dials outside the tower. Then the swing of the pendulum falls to a smaller arc. When this happens, the Hipp toggle that had previously been rattling harmlessly across the V-block falls into the notch in the V-block. Depressing the contact blades to which the V-block is fixed and closing the electrical contacts. The 20 Volts of direct current electricity surges through the many turns of insulated copper wire in the large power electromagnets. The 'rocker' armature is instantly & strongly attracted to the soft iron cores of the electromagnets. The impulse pallet roller on the tip of the armature catches in the hook jutting from from the pendulum. Giving it a powerful push. The pendulum regains the energy (and the wider swing) that it had lost. Normally the pendulum swings unaided for up to a minute in quiet weather. But when there is ice on the external clock hands or strong winds resisting their movement. Then the pendulum can ask for up to 30 times as many pushes from the electromagnets than usual. All thanks to the little free-swinging Hipp toggle and the V-block acting as an automatic governor on the minimum width of the pendulum swing. (or minimum arc in clock terminology) Astonishingly these two electromagnets replace the tons of weights required to drive a conventional turret clock. A mechanical tower clock would need to be very much larger to achieve the same power as this smallest "WT". The "WT" is driven from the fast-moving end of the gear train and geared down. While the conventional turret clock is driven from the slow end and has to fight the friction of a whole train of ever-faster moving gears. The advantage to the "WT" in greatly reduced friction and simplicity of construction must be obvious. It's relatively small size, without the need for the necessary & bulky weight shafts, made it suitable for many new clock towers. Often in situations where a weight driven clock was simply impossible to fit. It also required no employed staff to carry out the regular winding of the heavy weights like a conventional turret clock does. Larger images of the 'WT' are here: http://mysite.freeserve.com/waitingtrain2/index.jhtml