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A depth finder may refer to any of the following: Sonar: use of underwater sound propagation to measure depth; Fathometer or fishfinder: a device to locate fish at various water depths; Echo sounding: a technique using sound pulses to measure depth; sounding line: a length of rope used to measure water depth
The first fishfinder, i.e. sonar device meant to find underwater fish or schools of fish, was invented in Japan in the 1940s by the Furuno brothers, who were radio repairmen. Building from the knowledge of fishermen who were able to determine the presence of fish, and their number, from bubbles, the Furuno brothers first planned to detect these ...
A 4-inch (100 mm) underwater locator beacon, with ballpoint pen for scale A ULB attached to a bracket on a cockpit voice recorder. An underwater locator beacon (ULB), underwater locating device (ULD), or underwater acoustic beacon is a device that emits an acoustic pulse intended to guide searchers equipped with a suitable receiver to the location of the beacon underwater.
The unit has a depth rating of 150m and is designed for long-term autonomous recording. Recording life of up to 1500 hours is possible using 32 standard alkaline D cell batteries. The recorder can record sounds from 2 Hz to 48 kHz and stores recordings on up to four SDHC or SDXC cards. EM3 real-time spectrogram.
Hummingbird females build a nest resembling a small cup about 1.5 inches (3.8 cm) in diameter, commonly attached to a tree branch using spider webs, lichens, moss, and loose strings of plant fibers (image). [14] [15] Typically, two pea-shaped white eggs (image) – the smallest of any bird – are incubated over 2–3 weeks in breeding season.
Ruby-throated hummingbird. Order: Apodiformes Family: Trochilidae. Hummingbirds are small birds capable of hovering in mid-air due to the rapid flapping of their wings. They are the only birds that can fly backward
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