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Back to the math stuff:
I finished my engineering degree with a math minor; I only needed something like 6 more credits to have a double degree in ME and mathematics but was sick of school (and out of money). I think technically that the majority of trig is planar or constrained to a planar slice of 3D space (unless you're getting into spherical geometry or other non-Euclidian stuff). Algebra plays well in 3 (or more dimensions). I remember calculating some FEA problems by hand where the matrices were ~50 x 50 (which I guess is nothing compared to "real" FEA problems calc'd by software where the matrices are 1000's of elements wide...). Hardware: A Keufell & Esser slide rule (plastic) and a laminated aluminum Picket with the extra scales - both with belt holsters of course. ![]() ![]() Another Picket with its book and box (no idea where this came from): ![]() |
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Another K&E - laminated wood (looks to be walnut which was unusual):
![]() Guess the photo didn't come out that well. |
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Hodge-podge of "old" stuff. Bonus points if anybody else has the same mouse pad (and an old SGI 550 workstation in the garage to go with it).
![]() Not quite sure where the drafting instruments came from; it's older stuff and one of the dividers is engraved as 1940. The dead reckoning calculator was used by my wife's grandfather (who wasn't a pilot but was an engineer involved with aerospace in the 50's). This set of drafting instruments was given to me by one of my college profs as a graduation present; not quite sure on the date. ![]() I have actually used this set many times. The ruling pens work almost as well as my old Rotring tech pens - just don't move your hand too quickly. Was looking in my chest of drafting equipment for the old fountain pens and Rapidograph mechanical pencils - can't find them. Not sure where my lead holders are either. (And the secret to keeping the lead in your lead holder sharp is to rotate the lead holder while pulling a line...) Last edited by fanaudical; 10-21-2020 at 09:56 PM.. |
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And I guess I'll just put these links here (just in case you've read everything at the Museum of HP Calculators website):
https://sliderulemuseum.com/SRM_Home.htm https://www.sphere.bc.ca/test/ke-sliderule.html https://www.sphere.bc.ca/test/pickett.html One piece of calculation hardware that has always fascinated me is the mechanical integrator. I've seen one once in person - fascinating mechanism: https://commons.wikimedia.org/wiki/File:Mechanical_integrator_CHM.agr.jpg |
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![]() I'm pretty excited - bought a HP92 on the 'Bay and excitedly awaiting its arrival. The HP92 was Hewlett-Packard's desktop "financial/investor" printing calculator. https://www.hpmuseum.org/hp92.htm It is much rarer than the HP97 desktop "scientific" printing calculator, which I have sitting on my desk. I have been looking for a HP92 for many years, but they all seem to be $600+. I finally found one for a reasonable price and grabbed it. It has a problem in the paper feed mechanism, but I took the gamble that I can fix that. Why do I care if it is a HP92 or a HP97? Why do I want either on my desk? Well, sometimes you need to do some quick calculations and don't want to fire up Excel, I have a hard time using an algebraic calculator, and I really have little need for scientific functions but do occasionally have need for TVM and IRR functions. I think the HP92 does bond math too but I doubt I'll use it for that.
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1989 3.2 Carrera coupe 1988 Westy Vanagon, Zetec conversion Really want to find a clean E28 . . . Last edited by jyl; 11-23-2020 at 12:26 PM.. |
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Back in the saddle again
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Location: Houston, TX
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Quote:
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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canna change law physics
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My Dad used to guard this during the Korean War. He was 3/4th the way through college (Aeronautical Engineering) when he was drafted. His choice: OCS or Technician at the Supersonic Wind tunnel at Aberdeen Proving grounds, MD.
So, yep, he regularly pulled guard duty on the ENIAC. ![]()
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James The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994) Red-beard for President, 2020 |
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1980 911SC Fiberglass Turbo Flares F&R with a 3.6L conversion 869# AKA "Gemma" |
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![]() Here’s the HP92 elbowing aside the HP97. It needs the printer rollers repaired but that seems doable. HP97 is going on the shelf. ![]()
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1989 3.2 Carrera coupe 1988 Westy Vanagon, Zetec conversion Really want to find a clean E28 . . . |
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Feelin' Solexy
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I grew up in the TI-82 era so no slide rule for me, but still have an old CRC kicking around: ![]()
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Grant 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 1997 Boston Whaler Dauntless, 2008 Mini Cooper S, 2010 Mazda CX-9 - in the stable 1989 Porsche 944, 1973 VW Beetle - gone but not forgotten |
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I haven't been able to locate my dad's stuff from his time in the Navy but I'm still looking. Just need to dig a bit deeper.
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Grady aka plain fan 66 912 - enjoying the good life 78 911 SC and 90 C2 turbo look cab - gone but not forgotten 01 996 TT - ![]() 09 Audi A4 Avant - daily driver |
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I'm a Francophile, so its a Waterman :-)
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1989 3.2 Carrera coupe 1988 Westy Vanagon, Zetec conversion Really want to find a clean E28 . . . |
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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and differential equations? i got a B in that class, and i still never understood it. i just followed the steps.
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poof! gone |
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Very cool!
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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Slippery Slope Victim
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Mike˛ 1985 M491 |
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I see you
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Wow I haven't thumbed through a CRC in years. I still have my Lange's handbook but I loaned my Merck index to a friend and never saw it again.
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'12 M1100 mostro rosso, old bikers don't get old by accident “There is no nation on earth powerful enough to accomplish our overthrow. Our destruction, should it come at all, will be from another quarter. From the inattention of the people to the concerns of their government, from their carelessness and negligence.” |
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Really early stuff...
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"I would be a tone-deaf heathen if I didn't call the engine astounding. If it had been invented solely to make noise, there would be shrines to it in Rome" |
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Back in the saddle again
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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