More old wireless parts (6)

The contents of another junk box

I think this is a transformer from an old (pre-WW2) battery charger as its secondary winding looks like SWG10 or thereabouts?



This part made by RI (Radio Instruments Ltd, later of Croydon, founded in 1915) dates from around 1924 I should say and is not the more common a step-up transformer used between audio stages. It's three terminals are marked "0", "CT" and "1". I'm guessing, but it may be a push-pull output choke? This could have been used to connect HT to push-pull output valves with a high impedance loudspeaker connected across the anodes.



A WW2 milliammeter made by Ferranti in 1940.


I think this is a radio-frequency choke, clearly u/s and made by Climax about 1928



 An early tuning condenser using specially shaped vanes to produce tuning dial linearity. It looks like a foreign-made part, or conceivably a kit component made from individual parts assembled by the radio enthusiast?

 This tuning condenser is similar to that above, but made by Ormond. Because this part uses ebonite end sections I guess it's relatively early and made around 1923.



One of a multitude of small switches used for various applications including LT or HT switching and wavechange.

This has a metal plate marked "ON" and "OFF" so was for switching valve filaments. The name "FARADEX" and "BRITISH" are moulded into the bakelite body. This company also made transformers, coils and valve-holders. The use of bakelite implies it was made around 1934, although some forms of ebonite are this colour.




Slightly unusual below, this push-pull switch connects three terminals together when pulled and was made by Telsen of Aston, Birmingham. The ebonite body indicates early manufacture, say 1926. It was advertised under their code "W108" at 1/3d in 1929. They describe it as having a "knife action" mechanism and was "provisionally" patented under 14125/31.



Another unusual switch. This has no maker's name and might date from WW1, removed from a piece of government surplus equipment.

The switch has three positions, centre OFF, Left ON and right ON. The connections are not user friendly, depending on soldering rather than using screw terminals. An early type of ebonite is used in its construction.


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