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Unknown Barretter Lamp Here is a barretter lamp believed to be of military origin (note the arrow symbol on the etch). As I understand it, the filament is iron and the atmosphere inside the bulb is hydrogen, but more than that I don't know. Can anyone identify this device and tell me where it would have been used..? Keywords: Lamps

Unknown Barretter Lamp


Here is a barretter lamp believed to be of military origin (note the arrow symbol on the etch). As I understand it, the filament is iron and the atmosphere inside the bulb is hydrogen, but more than that I don't know.
Can anyone identify this device and tell me where it would have been used..?
DSC06542.JPG Mercury_vs_dysprosium.jpg 20181022_154836.jpg 2-kW-mercs.jpg DSC02964.JPG
Lamp/Fixture Information
Manufacturer:Not known at present
Model Reference:4003A
Lamp
Lamp Type:Barretter
Filament/Radiator Type:Iron filament in hydrogen atmosphere
File information
Filename:20181022_154836.jpg
Album name:Ria / Neon and other miscellaneous lamps
Keywords:Lamps
Filesize:329 KiB
Date added:Aug 10, 2024
Dimensions:2464 x 1386 pixels
Displayed:4 times
DateTime Original:2018:10:22 15:48:36
Exposure Time:1/17 sec
FNumber:f/2.4
Flash:No Flash
Focal length:3.3 mm
ISO:320
Model:SM-G800F
Software:G800FXXU1CRG3
White Balance:0
URL:https://trad-lighting.net/gallery/displayimage.php?pid=197
Favorites:Add to Favorites

Comment 1 to 2 of 2
Page: 1

Tuopeek   [Aug 15, 2024 at 10:03 PM]
I've seen them used in old valve electronics as current limiters to create a stable volt drop in a circuit. Don't think they are designed to glow too much in normal operation.
Ria   [Aug 15, 2024 at 11:37 PM]
Thanks, I've seen similar devices in old GPO telephone power supplies, thought it might be something like that.

Comment 1 to 2 of 2
Page: 1