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.
In Depth Tutorials and Information. The crime analysis and management approach known as COMPSTAT is widely heralded and frequently imitated. The tributes describe COMPSTAT as âperhaps the single most important organizational/ administrative innovation in policing during the latter half of the 20th centuryâ (Kelling and Sousa 2001,6).