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.
Users can search and obtain copies of land records such as deeds and mortgages and pay with a VISA or Master Card. The LandStat application supports analysis and display of aggregated data for land records information based on official documents tracked by the Department of Records through its PhilaDOX system.