Includes: 1: A Martin drawing showing the complete vehicle sans payload section, with inboard view of the first and second stages and transstage. 18067 x 4577 pixels. 2: Martin layout drawing of the core vehicle with numerous cross-sections. 22962 x 4332 pixels 3: United Aircraft drawing 4A0020, Rocket Motor - Flight Configuration.
NOAA scientists primarily use sonar to develop nautical charts, locate underwater hazards to navigation, search for and map objects on the sea floor such as shipwrecks, and map the sea floor itself. There are two types of sonarâactive and passive.
A hydrophone (Ancient Greek á½Î´ÏÏ = water and ÏÏÎ½Î® = sound) is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates electricity when subjected to a pressure change. Such piezoelectric materials, or transducers can convert a sound signal into an electrical signal since sound is a pressure wave. Some transducers can also serve as a projector, but not all have this capability, and may be destroyed if used in such a manner.