dynactinameter

[Gr. dynamis power, aktis (gen it. aktinos )=a ray or beam, and metron = a measure.] Optics: An instrument for measuring the intensity of the photogenic rays of light, and computing the power of object-gla es. [ACTINOMETER.) dy-na-grăph, s . [Gr. dynamis power, and grapho to write.) An instrument for recording the variations of the lifting power of an object moving in the atmosphere.