PHOTOCHRONOGRAPHY
Pho`to*chro*nog"ra*phy, n.
Defn: Art of recording or measuring intervals of time by the photochronograph. — Pho`to*chron`o*graph"ic (#), -graph"ic*al (#), a. — -graph"ic*al*ly, adv.
PHOTODROME
Pho"to*drome, n. Etym: [Photo- + Gr. (Physics)
Defn: An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction.
PHOTODYNAMICS
Pho`to*dy*nam"ics, n. [Photo-+ dynamics.] (Plant Physiol.)
Defn: The relation of light to the movements of plants and their organs; the study of the phenomena of curvatures induced by the stimulus of light. —Pho`to*dy*nam"ic (#), Pho`to*dy*nam"ic*al (#), a.
PHOTO-ELECTRIC
Pho`to-e*lec"tric, a. Etym: [Photo- + electric.]
Defn: Acting by the operation of both light and electricity; — said of apparatus for producing pictures by electric light.
PHOTO-ELECTRIC; PHOTO-ELECTRICAL
Pho`to-e*lec"tric, Pho`to-e*lec"tric*al, a.
Defn: Pert. to, or capable of developing, photo-electricity.