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vacuumtube

6 photos tagged vacuumtube, from 3 members of Flickr Commons.

When were these photos taken?

Where were these photos tagged?

None of these photos are geotagged.

Related tags

Tags that often appear on the same photos:

• hewlettpackard
• tube
• labcoat
• 1961
• simpson260
• industrial
• calibrationlabel
• portrait
• hands
• bowtie
• oldman
• autograph
• circuit
• 1947
• smithsonianinstitution
• electricalengineer
• smithsonianinstitutionlibraries
• triode
• americaninventor
• yaleuniversityphd
• vacuumtubevoltmeter
• vtvm
• meter
• chassis

Members using this tag

• SDASM Archives 4 photos
• The Library of Congress 1 photo
• Smithsonian Institution 1 photo

Conversations

Here’s a selection of the conversations happening on these photos:

Atlas Collection Image

from SDASM Archives

• precious amount said:

  A Simpson 260 is not a vacuum tube voltmeter.

Portrait of Lee De Forest (1873-1961), Electrical Engineer

from Smithsonian Institution

• Craig Jenkins said:

  en.wikipedia.org/wiki/Lee_De_Forest

NO CAPTION (LOC)

from The Library of Congress

• Jon (LOC P&P) said:

  There is another photo with a close up of the light bulb at www.loc.gov/pictures/item/2016885631/.

• Ross said:

  Rather than a light bulb, it seems to be a vacuum tube, and with four pins likely a triode amplifier. The drafting triangle etc. suggest the man may be working on an electronic schematic diagram, but I'm not sure how to start ID-ing him…

• Ross said:

  In the other photo showing a closeup of the tube, its metal base is stamped "PROPERTY OF AMERICAN TEL & TEL COMPANY" and "101 B PAT. IN USA" which leads to this German-language site…

• Flickr Foundation said:

  Yep. Not sure if this is the exact model but here's some information from a website that has some details in English, about these types of items. www.r-type.org/exhib/abo0031.htm

• Jon (LOC P&P) said:

  Thanks for the correction Ross. I tried searching some newspaper articles but didn't find either photo published.