Tik-tok moved by clockwork, and was made all of burnished copper.
In 1757 he presented a telescope to the king, so accurately driven by clockwork that it would follow a star all night long.
In the actual instrument, the paper diagram is mounted upon a drum caused by clockwork to revolve uniformly, and is ruled with vertical hour lines, and horizontal quantity lines representing gallons per hour.
In February 1884 there was a plot to blow up four London railway stations by means of clockwork infernal machines containing dynamite, brought from America.
In the case of the original Repsold plan without clockwork the description is not quite exact, because both the process of following the object and correcting the aim are simultaneously performed; whilst, if the clockwork runs uniformly and the friction-disk is set to the proper distance from the apex of the cone, the star will appear almost perfectly at rest, and the observer has only to apply delicate corrections by differential gear - a condition which is exactly analogous to that of training a modern gun-sight upon a fixed object.