⊙ AntiQuark

Truth, Beauty, Charm, Strange


Virtual Slide Rule, Part Deux

Following up on my original post, I've scanned and virtualized my Pickett N4-ES Vector Type LOG LOG DUAL BASE SPEED RULE. That's the most complicated rule that Picket produced. It has 34 scales, which is good, because in the world of slide rule collecting, bigger is better. (more info here).

The images and alignment are great, the only problem is the rule itself. I picked it up on eBay for about $16 dollars. It was grubby, with marks and scratches on the body. The plastic cursor was covered with very fine scratches and looked foggy. I was able to sorta fix that by rubbing toothpaste on it with a cloth (a tip I found in the ISRG archives), but I couldn't do anything about the small gouges.

The rule needed a good cleaning. It smelled like cigarette smoke, and there was a powdery residue that corroded one of the end pieces. The residue smelled like vomit. I'm convinced that at one time this was the "community slide rule" in some engineering frat house.

Thanks to JavaScript and DHTML, you can now use this slide rule without experiencing the unpleasant odors. Link: Virtual N4-ES.


  • At 8/04/2005 10:39 AM, Anonymous captcrisis said…

    Beautiful! I have an N4-ES too. Thanks!

  • At 9/20/2005 3:29 PM, Anonymous Wayne Morrison said…

    What vivid memories the picture of the N4ES conjured up. I bought mine in 1959. Used it extensively while going through a long string of electronics courses at the Federal Aviation Administration's Academy in Oklahoma City. It's in the attic somewhere and still in pristine condition.

  • At 10/11/2006 3:24 PM, Anonymous Anonymous said…

    Ha llegado a mis manos una regla de calculo que no se identificar plenamente, tiene 7 escalas y mide 15 cms., lamentablemente tampoco la se manejar, no tiene marca de fabricante, soy ingeniero en aeronáutica de reciente generación y obviamente en mi vida he visto este instrumento, aun asi estoy muy interesado en saber su manejo y utilidad, podrias ayudarme con esto???
    Te lo agradecere enormemente.

  • At 10/11/2006 4:32 PM, Blogger Derek said…

    There are some examples here that might be useful to help you learn:


  • At 1/29/2009 4:27 PM, Anonymous Anonymous said…

    To clean the scratches off the plastic part you might want to try methods that are used to remove scratches from automotive headlights. I have heard of people using ultra-fine grit sandpaper, ie. 2000 grit, and various rubbing compounds.


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