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IT NewsUnwinding an Unusual Slide Rule - If the Otis King slide rule in [Chris Staecker’s] latest video looks a bit familia... - <a href="https://hackaday.com/2025/05/12/unwinding-an-unusual-slide-rule/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://hackaday.com/2025/05/12/unwinding-an-unusual-slide-rule/</a> <a href="https://schleuss.online/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#retrocomputing</a> <a href="https://schleuss.online/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://schleuss.online/tags/otisking" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#otisking</a>

amen zwa, esq.The <a href="https://mathstodon.xyz/tags/SlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SlideRule</a>, like the <a href="https://mathstodon.xyz/tags/LogBook" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#LogBook</a>, is probably as useless as the <a href="https://mathstodon.xyz/tags/PocketCalculator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PocketCalculator</a>, today. But I am obsessed with those relics, even in the face of modern 64-bit and 128-bit CPUs.I hope, in a couple of decades when I'm six-feet-under, people still appreciate those CPUs as we do the slide rule.

Isaac MottistoneShowing my age I know but here is my first ever ‘scientific calculator’. With no batteries to run out, the slide rule was the perfect solution to carrying out engineering and scientific calculations. <a href="https://mastodonapp.uk/tags/SlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SlideRule</a> <a href="https://mastodonapp.uk/tags/calculator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#calculator</a>

IT NewsMechanical Calculator Finds Derivitives - We like mechanical calculators like slide rules, but we have to admit that we had ... - <a href="https://hackaday.com/2025/01/06/mechanical-calculator-finds-derivitives/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://hackaday.com/2025/01/06/mechanical-calculator-finds-derivitives/</a> <a href="https://schleuss.online/tags/derivimeter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#derivimeter</a> <a href="https://schleuss.online/tags/derivitive" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#derivitive</a> <a href="https://schleuss.online/tags/mischacks" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#mischacks</a> <a href="https://schleuss.online/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://schleuss.online/tags/calculus" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#calculus</a>

Inaction Figure<a href="https://mastodon.nz/@joncounts" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@joncounts</a> <a href="https://sfba.social/@14mission" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@14mission</a> So it’s a Circular <a href="https://fosstodon.org/tags/SlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SlideRule</a> ! Outstanding! <a href="https://fosstodon.org/tags/CircularSlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CircularSlideRule</a>

Khurram Wadee ✅After looking for a long time, I finally found this <a href="https://mastodon.org.uk/tags/Sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sliderule</a>, which belonged to my late father. Some of you will know that these <a href="https://mastodon.org.uk/tags/devices" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#devices</a> were used, before the advent of digital <a href="https://mastodon.org.uk/tags/Calculators" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Calculators</a>, to perform <a href="https://mastodon.org.uk/tags/arithmetic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#arithmetic</a> operations such as <a href="https://mastodon.org.uk/tags/multiplication" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#multiplication</a> and <a href="https://mastodon.org.uk/tags/division" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#division</a> to about three significant figures, by <a href="https://mastodon.org.uk/tags/scientists" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#scientists</a> and <a href="https://mastodon.org.uk/tags/engineers" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#engineers</a>.<a href="https://mastodon.org.uk/tags/Mathematics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Mathematics</a> <a href="https://mastodon.org.uk/tags/Computation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Computation</a> (1/2)

joatFound in a thrift store. Hard to believe that people used to use this actual thing to do actual calculations to fly actual planes. <a href="https://mastodon.scot/tags/SlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SlideRule</a> <a href="https://mastodon.scot/tags/AnalogComputer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#AnalogComputer</a> <a href="https://mastodon.scot/tags/aviation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#aviation</a>

the roamer<a href="https://flx.masto.host/@bosak" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@bosak</a> :-)Our fellow Mastodonian <a href="https://mathstodon.xyz/@AmenZwa" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@AmenZwa</a> has written a lovely historical article on all things sliderule:<a href="https://mathstodon.xyz/@AmenZwa/109309143345481028" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://mathstodon.xyz/@AmenZwa/109309143345481028</a><a href="https://mastodonapp.uk/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://mastodonapp.uk/tags/TeX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#TeX</a> <a href="https://mastodonapp.uk/tags/TeXLaTeX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#TeXLaTeX</a> <a href="https://mastodon.sdf.org/@ldbeth" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@ldbeth</a>

LdBethI was trying to typeset the 4 chapters K&E 4083 <a href="https://mastodon.sdf.org/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> supplement manual in plain <a href="https://mastodon.sdf.org/tags/TeX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#TeX</a> for better readability but ended up adding 1/3 more materials, and half of the addendum is now my original writing.

IT NewsThe Genius of Slide Rule Precision - Most people have heard of or seen slide rules, with older generations likely havin... - <a href="https://hackaday.com/2024/05/29/the-genius-of-slide-rule-precision/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://hackaday.com/2024/05/29/the-genius-of-slide-rule-precision/</a> <a href="https://schleuss.online/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://schleuss.online/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#science</a>

Inaction Figure<a href="https://federate.social/@mattblaze" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@mattblaze</a> Nathan Zeldes’ site is a treasure trove! <a href="https://fosstodon.org/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://fosstodon.org/tags/sliderules" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderules</a>

AstroKiste 🏴Best <a href="https://mastodon.social/tags/pocket" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#pocket</a> <a href="https://mastodon.social/tags/calculator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#calculator</a> I own. Needs no batteries. <a href="https://mastodon.social/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://mastodon.social/tags/analog" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#analog</a> <a href="https://mastodon.social/tags/rechenschieber" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rechenschieber</a> <a href="https://mastodon.social/tags/rechenstab" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rechenstab</a> <a href="https://mastodon.social/tags/taschenrechner" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#taschenrechner</a>

IT NewsJoost Bürgi and Logarithms - Logarithms are a common idea today, even though we don’t use them as often as we u... - <a href="https://hackaday.com/2024/02/27/joost-burgi-and-logarithms/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://hackaday.com/2024/02/27/joost-burgi-and-logarithms/</a> <a href="https://schleuss.online/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#retrocomputing</a> <a href="https://schleuss.online/tags/logarithms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#logarithms</a> <a href="https://schleuss.online/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a>

IT NewsCalculation Before We Went Digital - We have to like [Nicola Marras]. First, he wrote a great mini-book about analog co... - <a href="https://hackaday.com/2023/12/17/calculation-before-we-went-digital/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://hackaday.com/2023/12/17/calculation-before-we-went-digital/</a> <a href="https://schleuss.online/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#retrocomputing</a> <a href="https://schleuss.online/tags/calculator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#calculator</a> <a href="https://schleuss.online/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a>

IT NewsPocket Calculator isn’t a Brain or Magic - If you predate the pocket calculator, you may remember slide rules. But slide rule... - <a href="https://hackaday.com/2023/10/20/pocket-calculator-isnt-a-brain-or-magic/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://hackaday.com/2023/10/20/pocket-calculator-isnt-a-brain-or-magic/</a> <a href="https://schleuss.online/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#retrocomputing</a> <a href="https://schleuss.online/tags/calculator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#calculator</a> <a href="https://schleuss.online/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://schleuss.online/tags/teardown" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#teardown</a>

Mark StosbergThis is a <a href="https://urbanists.social/tags/Braille" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Braille</a> <a href="https://urbanists.social/tags/SlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SlideRule</a>

Inaction FigureJust as an introductory post, here are a few interesting slide rules from my collection... <a href="https://fosstodon.org/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://fosstodon.org/tags/sliderules" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderules</a>

Thilo, EE 🤘🏼🇪🇺⚛🎗️<a href="https://spacey.space/@PointyEndUp" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@PointyEndUp</a> Maybe you also need to scale it up? 🤔😁 (I'll have to see if I have photos of my Pickett slide rules, too. Too lazy to open the boxes. 😇)<a href="https://oldbytes.space/tags/SlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SlideRule</a> <a href="https://oldbytes.space/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RetroComputing</a>

AstroKiste 🏴Best <a href="https://chaos.social/tags/pocket" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#pocket</a> <a href="https://chaos.social/tags/calculator" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#calculator</a> I own. Needs no batteries. <a href="https://chaos.social/tags/sliderule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sliderule</a> <a href="https://chaos.social/tags/analog" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#analog</a> <a href="https://chaos.social/tags/rechenschieber" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rechenschieber</a> <a href="https://chaos.social/tags/rechenstab" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rechenstab</a> <a href="https://chaos.social/tags/taschenrechner" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#taschenrechner</a>

Thilo, EE 🤘🏼🇪🇺⚛🎗️Close enough, I think. The angles don't quite match. But the book design isn't true, anyway, as the scales are not like the original slide rules. Also my StudioLog wasn't closed completely.<a href="https://oldbytes.space/tags/SlideRule" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SlideRule</a>

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