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.
CompStat is a data-driven police management technique, developed in New York to reduce and prevent crime. Initially done by hand and then computerized in 1994, CompStatâs management and accountability system helps police take up strategies based on accurate data collection.