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ch these and the circuit-wheels make a revolution are automatically adjusted, so that equal intervals shall elapse between the striking of each tap of the signal, which denotes the units, tens, or hundreds, as the case may be; the gearing then ensures a complete revolution of the circuit-wheel; the remaining part of the signal, if it consists of more than one place of figures, is struck in a similar way, and the operation is continuously repeated until the regulator-wheel is displaced. Chester's fire-alarm repeater. Re-peat′ing–cir′cle. A reflecting-instrument, on the principle of the sextant, for measuring angular distances. The image of one of the observed objects, after being reflected from a mirror on a pivoted arm and again from a fixed mirror, is brought into coincidence with the other seen by direct vision; the apparent angular distance is thus doubled, and the graduations of the circle, which are continued all the way around its limb, thus embrace 720° of are.