GB139530A - Improvements in or relating to acoustic or compressional-wave directive signalling - Google Patents
Improvements in or relating to acoustic or compressional-wave directive signallingInfo
- Publication number
- GB139530A GB139530A GB13870/18A GB1387018A GB139530A GB 139530 A GB139530 A GB 139530A GB 13870/18 A GB13870/18 A GB 13870/18A GB 1387018 A GB1387018 A GB 1387018A GB 139530 A GB139530 A GB 139530A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound
- detectors
- tank
- signalling
- lead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
139,530. Fessenden, R. A. Aug. 16, 1917, [Convention date]. Audible signals; locating sounds; subaqueous sound signals.-Apparatus for the transmission and reception of acoustic waves, described as particularly for directional signalling, and for the location of submarines and submarine signalling- stations, but stated to be applicable also to locating aeroplanes, comprises sound signalling-mechanism placed in liquid in a tank the walls of which are arranged to have the same refractive index for sound as that of the medium outside the tank. Two sound-detectors placed in liquid in a tank are independently connected electrically to two indicators. The receivers may be separated by a sound screen producing the same shadow with relation to the detectors as the human head produces with relation to the ears. As shown, two detectors 11, 12, which may be microphones, stethoscopes, or electro-magnetic receivers, but are preferably oscillators of the kind described in Specification 18765/13, are separated by a soundinsulating screen 13 with an extension 14, the shape of which is determined by experiment. The detectors are placed in a tank, or adjacent tanks, containing oil or water, extending across a ship and separated from the bow and stern by air chambers. The detectors and screen are rotatable about a pivot 29. The detectors are independently connected to telephone receivers 26, 27 on a head-piece through circuits each including a switch 34, 35, adjustable capacity 22, 23, and inductanca 24, 25 by which phase-difference may be adjusted. To give the walls of the tank the same refractive index as the water outside, they are loaded with weights 40 of lead, tungsten, zinc, tin, tin alloyed with lead, or other material, or plates may be used having punched holes filled with lead or brass. The distance between the weights should not exceed a quarter wave-length of the sound to be received. The distance between the detectors should bear the same ratio to the distance between the human ears as the velocity of sound in the medium in the tank bears to the velocity of sound in air.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF50906D DE375144C (en) | 1920-07-03 | Tank arrangement for underwater sound apparatus | |
| DEF0050907 | 1920-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB139530A true GB139530A (en) | 1920-02-26 |
Family
ID=25977538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13870/18A Expired GB139530A (en) | 1920-07-03 | 1918-08-26 | Improvements in or relating to acoustic or compressional-wave directive signalling |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE375144C (en) |
| GB (1) | GB139530A (en) |
-
0
- DE DEF50906D patent/DE375144C/en not_active Expired
-
1918
- 1918-08-26 GB GB13870/18A patent/GB139530A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE375144C (en) | 1923-05-08 |
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