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wellerstein's profile
Alex Wellerstein
Alex Wellerstein
Alex Wellerstein
Verified account
@wellerstein

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Alex WellersteinVerified account

@wellerstein

Historian of science, secrecy, and nuclear weapons. Professor of STS at @FollowStevens. UC Berkeley alum with a Harvard PhD. NUKEMAP creator. Coder and web dev.

Hoboken, NJ / NYC
blog.nuclearsecrecy.com
Joined September 2011

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    1. Casillic‏ @Casillic 7 Aug 2016
      • Report Tweet

      Question: what are these cables for on #littleboy ? They're not electric @NuclearAnthro @AtomicAnalyst @wellersteinpic.twitter.com/Z3bcfj4n5u

      4 replies 3 retweets 6 likes
    2. Alex Wellerstein‏Verified account @wellerstein 7 Aug 2016
      • Report Tweet
      Replying to @Casillic @NuclearAnthro @AtomicAnalyst

      Pullout wires — start the firing mechanism when they are yanked out by the bomb leaving the plane.

      1 reply 0 retweets 3 likes
    3. Casillic‏ @Casillic 7 Aug 2016
      • Report Tweet
      Replying to @wellerstein @NuclearAnthro @AtomicAnalyst

      thanks! Seems strange to need so many. Could understand 2 or even 3 but there's a lot there...

      1 reply 0 retweets 2 likes
    4. Alex Wellerstein‏Verified account @wellerstein 8 Aug 2016
      • Report Tweet
      Replying to @Casillic @NuclearAnthro @AtomicAnalyst

      14 to be precise! I don't know why they needed/wanted so many.

      1 reply 0 retweets 2 likes
    5. Stephen Schwartz‏Verified account @AtomicAnalyst 2 Dec 2018
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      Replying to @wellerstein @Casillic @NuclearAnthro

      Redundancy to ensure detonation?

      2 replies 0 retweets 1 like
    6. Casillic‏ @Casillic 2 Dec 2018
      • Report Tweet
      Replying to @AtomicAnalyst @wellerstein @NuclearAnthro

      It’s been awhile but I think it was there was no central control mechanism, so basically each piece subsystem needed to know when the show starts individually. But not sure. Think Fatman only had three on the nose section but again not sure.pic.twitter.com/HzhHKcYP9X

      3 replies 1 retweet 5 likes
    7. Alex Wellerstein‏Verified account @wellerstein 3 Dec 2018
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      Replying to @Casillic @AtomicAnalyst @NuclearAnthro

      For postwar FM models there were 12 pullout switches. Not super easy to see from this circuit diagram but it shows how they are used (they are S1, S2, etc.). Two are assigned to batteries leading to the X-unit. Two each are assigned to each Archie. Two more for other power needs.pic.twitter.com/5HRmWs2upo

      1 reply 0 retweets 2 likes
    8. Alex Wellerstein‏Verified account @wellerstein 3 Dec 2018
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      Replying to @wellerstein @Casillic and

      I don't have as detailed information on either the LB or the wartime FM but one can imagine they used similar philosophies. Some redundancy, but also, just a lot of different systems that for safety they are operating with different switches.

      1 reply 0 retweets 1 like
      Alex Wellerstein‏Verified account @wellerstein 3 Dec 2018
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      Replying to @wellerstein @Casillic and

      (Images are from the remarkable Mk-III fuzing maintenance manual that John Coster-Mullen was able to get by FOIA request a few years back.)pic.twitter.com/menehLxegE

      5:17 AM - 3 Dec 2018
      • 1 Retweet
      • 5 Likes
      • Grant W. Trent Martin “Doomsday” Pfeiffer (⧖) 🏳️‍🌈 Michael Duitsman andrew casilli Casillic
      1 reply 1 retweet 5 likes
        1. Casillic‏ @Casillic 3 Dec 2018
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          Replying to @wellerstein @AtomicAnalyst @NuclearAnthro

          Yeah awesome remember it well. You sent me a copy too! Thanks again.

          0 replies 0 retweets 3 likes
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