An eBay seller listed this not knowing what they had, or what is worth. Posting this here to show the capsule (second photo from the left - the shiny center cup) and what's left of the broken mica seal.
Transmitter is missing the face plate, two springs with mounting screws and obviously the carbon granules.
http://www.ebay.com/itm/I-believe-this-is-an-Antique-telephone-microphone-element-/152557005681
I'd pay 50ยข if found at a local antique mall, not what this seller wants.
busted up Kellogg transmitter
Quote from: wds on May 23, 2017, 07:00:12 PM
busted up Kellogg transmitter
Thanks, that's what I though (working on one now) but didn't want to make a false claim.
Based on the first picture, I wonder if the bridge was still intact, mounted, and the seller decided to pull it apart and in the process lost the carbon granules and essentially destroyed the transmitter. Could be rebuilt but not worth the effort, time or money.
Posted to members who have never had the opportunity to "accidentally" bust one of these up to see what the internal parts look like, and why not to remove the bridge from the diaphragm.
This one is in working condition, intact so to speak less washers.