Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
MorlockP's profile
ⓘ Dogs don't have thumbs
ⓘ Dogs don't have thumbs
ⓘ Dogs don't have thumbs
@MorlockP

Tweets

ⓘ Dogs don't have thumbs

@MorlockP

Two-time Prometheus award-winning hard science fiction author. https://www.amazon.com/dp/B005JPPMS6  Learn how to homestead https://www.amazon.com/dp/B093BC3K1T 

Aristillus Crater, Luna
amazon.com/dp/B005JPPMS6
Joined June 2012

Tweets

  • © 2022 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. foone‏ @Foone 16 Sep 2020

      then there's mercury slip rings: these don't have a brush, instead they just have liquid mercury that maintains a continuous contact with less interference.pic.twitter.com/ugcZnhZR7t

      2 replies 3 retweets 61 likes
      Show this thread
    2. foone‏ @Foone 16 Sep 2020

      but the final type... is the wireless slip ring. What. Wireless? The whole point of a slip ring is to electrically connect a stationary thing with a rotating thing! If you could do wireless, why would you need a slip ring?

      2 replies 2 retweets 57 likes
      Show this thread
    3. foone‏ @Foone 16 Sep 2020

      and it turns out the reason is: POWER! You have a device that needs to rotate, and it needs power (and signals) So you need a way to get power and data in and out... but regular slip rings are too electrically noisy, and wear out, and mercury is too dangerous...

      3 replies 0 retweets 52 likes
      Show this thread
    4. foone‏ @Foone 16 Sep 2020

      So the answer is WIRELESS SLIP RINGS! Also known as a rotary transformer. Basically, you build a bunch of little coils around each other, and this becomes the primary side of the transformer, with the secondary side being in the rotating part.pic.twitter.com/kxGNRDCwu2

      2 replies 3 retweets 73 likes
      Show this thread
    5. foone‏ @Foone 16 Sep 2020

      the quick TL;DR of how a transformer works is that you have some magnetic core, and two coils of wire with different numbers of windings. The varying current in the primary creates a magnetic field which creates another varying current in the secondary.pic.twitter.com/X2SGm5yqfA

      2 replies 3 retweets 51 likes
      Show this thread
    6. foone‏ @Foone 16 Sep 2020

      but the core can be all sorts of things, including just... air. It won't work as well (because an iron/steel/whatever core has less loss at lower frequencies), but it'll work. You're just turning an AC signal into a magnetic field and back.

      1 reply 0 retweets 53 likes
      Show this thread
    7. foone‏ @Foone 16 Sep 2020

      This, btw, is how the wireless charging in your phone works. There's a coil inside your phone, and the matching coil inside the charger creates a magnetic field that gets turned back into a current inside your phone.pic.twitter.com/oFIVufcFFL

      3 replies 1 retweet 66 likes
      Show this thread
    8. foone‏ @Foone 16 Sep 2020

      but back to wireless slip rings... do you know where they were primarily used, and why you might have had one? There was something very common, in most households, which needed to have a part spin very fast for a long time (without breaking), with power and data...

      1 reply 2 retweets 57 likes
      Show this thread
    9. foone‏ @Foone 16 Sep 2020

      Here's a zoomed-out hint.pic.twitter.com/gMhm40IgeI

      4 replies 2 retweets 66 likes
      Show this thread
    10. foone‏ @Foone 16 Sep 2020

      It's the head of a VCR!pic.twitter.com/Zi7nd7u64c

      9 replies 2 retweets 101 likes
      Show this thread
      ⓘ Dogs don't have thumbs‏ @MorlockP 16 Sep 2020
      Replying to @Foone

      darn I was too slow w that guess

      2:31 PM - 16 Sep 2020
      • 1 Like
      • Limes
      0 replies 0 retweets 1 like

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2022 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info