Mechanical waves require a medium to travel through. Examples of mechanical waves are sound waves, water waves, a vibrating string. (See related link). Electromagnetic waves â¦(such as light, radio waves, X-rays, microwaves) do not need a medium to travel through, so these are not mechanical waves.
Photostat definition, a camera for making facsimile copies of documents, drawings, etc., in the form of paper negatives on which the positions of lines, objects, etc., in the originals are maintained. a copy made with this camera.
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Photograph(noun) a picture or likeness obtained by photography. 2  Photograph(verb) to take a picture or likeness of by means of photography; as, to photograph a view; to photograph a group. 3  Photograph(verb) to practice photography; to take photographs.