cyclonoscope

from The Century Dictionary.

• noun A hurricane-indicator; an apparatus (devised by Padre Viñes, S. J., Havana) consisting of an outer card with compass-points and an inner movable card with lines, to show the direction of motion of the various atmospheric currents constituting the circulation of a tropical hurricane.

from the GNU version of the Collaborative International Dictionary of English.

• noun An apparatus to assist in locating the center of a cyclone.