#sliderule — Public Fediverse posts

Because I'm super geeky like that, I've started using a circular #SlideRule when I score #baseball games -- I set the ballpark capacity on the D scale, the attendance on the C scale, and look under the 1 on the D to read the percentage of capacity on C. Accurate enough for my scoresheets.

Just went back and filled that percentage to all the college and #WorldBaseballClassic games I've scored this year.

Because I'm super geeky like that, I've started using a circular #SlideRule when I score #baseball games -- I set the ballpark capacity on the D scale, the attendance on the C scale, and look under the 1 on the D to read the percentage of capacity on C. Accurate enough for my scoresheets.

Just went back and filled that percentage to all the college and #WorldBaseballClassic games I've scored this year.

The Zero-Power Flight Computer

https://fed.brid.gy/r/https://hackaday.com/2026/03/23/the-zero-power-flight-computer/

The Zero-Power Flight Computer

https://web.brid.gy/r/https://hackaday.com/2026/03/23/the-zero-power-flight-computer/

The Zero-Power Flight Computer

https://web.brid.gy/r/https://hackaday.com/2026/03/23/the-zero-power-flight-computer/

The Zero-Power Flight Computer

https://fed.brid.gy/r/https://hackaday.com/2026/03/23/the-zero-power-flight-computer/

The Zero-Power Flight Computer

https://web.brid.gy/r/https://hackaday.com/2026/03/23/the-zero-power-flight-computer/

Sliderule Simulator Teaches You How To Do Calculations The Old Fashioned Way

https://web.brid.gy/r/https://hackaday.com/2026/02/18/sliderule-simulator-teaches-you-how-to-do-calculations-the-old-fashioned-way/

Carl F #Krafft posited: #Venturi forces account for 1806× #mass-difference in #proton & #electron but #polarity looks minor compared to #equatorial #flux. The point is, I'm working #conceptually but Krafft used a #sliderule. WHERE'S YOUR #COMPUTER‽ #electrogravitics Full #PDF t.me/gonzojourney...

Retrotechtacular: Learning the Slide Rule the New Old Fashioned Way https://hackaday.com/2025/12/02/retrotechtacular-learning-the-slide-rule-the-new-old-fashioned-way/ #Retrotechtacular #instructional #trainingfilm #ToolHacks #sliderule

Slide Rule by Helix https://hackaday.com/2025/06/04/slide-rule-by-helix/ #3dPrinterhacks #Retrocomputing #calculation #sliderule

In this session, Alex Arthur (@JamesA) shared an odd fountain they found whilst travelling that is both mathsy and artsy. @Tony_Mann showed us a magic square, which is interesting whichever way you look at it: https://www.markfarrar.co.uk/chris-wardles-reflections-magic-square.htm. We revisited (a kind of) slide rule with @gavan Fantom, who told us about Mechanical Flight Computers. We then heard from @pozorvlak about lathes, and cool shapes that can be produced using them (including a https://en.wikipedia.org/wiki/Hypotrochoid) Vanessa Madu talked about modelling an ocean and the commendable properties of rubber ducks for this: https://en.wikipedia.org/wiki/Friendly_Floatees_spill. Following this, Joey Marianer spoke on the Prisoner's Dilemma and intuition (see https://www.lesswrong.com/posts/HFyWNBnDNEDsDNLrZ/the-true-prisoner-s-dilemma for more info). @andrewt then spoke about a graphics trick used in old videogames to rotate sprites - just do three shears! #mathsjam #maths #fountain #strasbourg #magicsquares #sliderule #flightcomputer #modelling #rubberducks #ocean #prisonersdilemma #graphics #videogames #shears #imagerotation

Today's oddity: showed an actual degreed and employed #engineer how to use a cheap #Vernier #caliper to get accurate measurements down to 0.1mm.

Caveats: engineer is much younger than me, this was an old-school caliper without a dial or digital readout, their primarily field is fluid dynamics (so not a lot of calipers). And they understood the idea quickly.

But now I'm wondering this person would panic at the sight of a #slideRule. Tempting to throw one in the bag "just in case."

Laser-Engraving Hairlines: When a Line Isn’t a Line - When is a line not a line? When it’s a series of tiny dots, of course!
The line is... - https://hackaday.com/2022/05/29/laser-engraving-hairlines-when-a-line-isnt-a-line/ #retrocomputing #laserengrave #laserhacks #sliderule #tektronix #hairline

Laser-Engraving Hairlines: When a Line Isn’t a Line - When is a line not a line? When it’s a series of tiny dots, of course!
The line is... - https://hackaday.com/2022/05/29/laser-engraving-hairlines-when-a-line-isnt-a-line/ #retrocomputing #laserengrave #laserhacks #sliderule #tektronix #hairline