Photomagnetic :: Photomagnetic (a.) Of or pertaining to photomagnetism.
Photomagnetism :: Photomagnetism (n.) The branch of science which treats of the relation of magnetism to light.
Photomechanical :: Photomechanical (a.) Pertaining to, or designating, any photographic process in which a printing surface is obtained without the intervention of hand engraving..
Photometer :: Photometer (n.) An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power..