File:Trasmettitore di Augusto Righi.JPG
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editDescriptionTrasmettitore di Augusto Righi.JPG |
Italiano: Trasmettitore di Augusto Righi.
Apparecchiatura storica conservata nell'IISS "Marconi" di Bari
English: Four ball Righi spark gap, invented by physicist Augusto Righi in 1894 for use in spark-gap radio transmitters. Righi was one of the first scientists to investigate microwaves, generating waves up to 12 GHz (2.5 cm wavelength) using resonator ball spark gaps like this. In use the outer balls were connected to the terminals of a induction coil which applied pulses of high voltage electricity, causing sparks to jump across the 3 spark gaps. The concept was that the outer balls were "charging" balls, which charged the two inner balls with opposite voltage, and the spark discharge between the inner "resonator" balls generated standing waves of current in the metal balls, which radiated the energy as microwaves. The two inner balls were often enclosed in a container of vaseline to allow the balls to be located closer together, to minimize the length of spark and thus the thermal energy lost during oscillation. Righi was the mentor of Guglielmo Marconi who designed the first practical radio communication systems. Marconi used Righi spark gaps like this in his first transmitters. |
Date | 11 August 2012 (original upload date) |
Source | Transferred from it.wikipedia to Commons. |
Author | The original uploader was Geppisimone at Italian Wikipedia. |
Permission (Reusing this file) |
Released into the public domain (by the author). |
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This work has been released into the public domain by its author, Geppisimone, at the English Wikipedia project. This applies worldwide. In case this is not legally possible: |
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Original upload log
editDate/Time | Dimensions | User | Comment |
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2012-08-11 13:16 | 1600×1200× (537395 bytes) | Geppisimone | Trasmettitore di Righi. Apparecchiatura storica conservata nell'IISS "Marconi" di Bari |
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current | 17:53, 15 August 2021 | 1,600 × 1,200 (525 KB) | Threecharlie (talk | contribs) | Transferred from it.wikipedia via #commonshelper |
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Camera manufacturer | Canon |
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Exposure time | 1/100 sec (0.01) |
F-number | f/3.5 |
ISO speed rating | 640 |
Date and time of data generation | 13:23, 14 October 2009 |
Lens focal length | 10.093 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 13:23, 14 October 2009 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 13:23, 14 October 2009 |
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APEX exposure bias | 0 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
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