File:Brockhaus-Efron Oscillation 1.jpg
Brockhaus-Efron_Oscillation_1.jpg (465 × 336 pixels, file size: 22 KB, MIME type: image/jpeg)
Captions
DescriptionBrockhaus-Efron Oscillation 1.jpg |
Русский: Иллюстрация к статье Электрические колебания из энциклопедии Брокгауза и Ефрона
English: A Hertzian spark-gap transmitter, the earliest type of radio transmitter. Used by Heinrich Hertz in his historic 1889 experiments demonstrating the existence of radio waves. It consists of an induction coil (R) that produces high voltage pulses, and a spark gap (B1, B2) attached to a dipole antenna consisting of two metal plates (A1, A2) attached to brass rods L1, L2. When a spark jumps across the spark gap, it discharges the electric charge stored on the antenna, creating damped sinusoidal oscillations in the antenna that were radiated as radio waves in the UHF range. The plates, called "capacity areas", functioned to add capacitance to the antenna to increase the charge stored on it by the induction coil before the spark gap fires, increasing the output power. They also decreased the resonant frequency of the dipole, making the waves longer. The plates could be slid in or out on the rods to "tune" the transmitter. From article "Electric Oscillations" in Brockhaus & Efron encyclopedia. |
||||||||
Date |
circa 1905 date QS:P,+1905-00-00T00:00:00Z/9,P1480,Q5727902 |
||||||||
Source | http://dic.academic.ru/dic.nsf/brokgauz_efron/146322 | ||||||||
Author | Брокгауз и Ефрон | ||||||||
Permission (Reusing this file) |
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 21:27, 23 June 2009 | 465 × 336 (22 KB) | Lozman (talk | contribs) | {{Information |Description={{ru|Иллюстрация к статье ''Электрические колебания'' из энциклопедии Брокгауза и Ефрона}} |Source=http://dic.academic.ru/dic.nsf/brokgauz_efron/146322 |Date= |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
File usage on other wikis
The following other wikis use this file:
- Usage on ru.wikisource.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
_error | 0 |
---|