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<blockquote data-quote="opnblstr" data-source="post: 2110677" data-attributes="member: 1647">I have several slide rules - kind of a collector.&nbsp; Fav is my Aristo 970 but also like the good American K&amp;E DeciLon and Post Versalog 1460.&nbsp; Have a few Pickett rules like my N4ES but they have too much parallax to read quickly.For anyone that has one but no idea how it works, the C and D scales are the basic multiply and divide and are the place to start.&nbsp; Multiply is thought of as adding C to D and dividing is subtracting C from D since you are really adding and subtracting logs.I totally agree that people who originally learned on a slide rule developed an ability to quickly sanity check their results since you have to decide where to put the decimal in any answer so as the other poster said, is it 8.0, 80, or 800?See:&nbsp; <a href="http://www.hpmuseum.org/srinst.htm" target="_blank">http://www.hpmuseum.org/srinst.htm</a></blockquote>

[QUOTE="opnblstr, post: 2110677, member: 1647"] I have several slide rules - kind of a collector. Fav is my Aristo 970 but also like the good American K&E DeciLon and Post Versalog 1460. Have a few Pickett rules like my N4ES but they have too much parallax to read quickly. For anyone that has one but no idea how it works, the C and D scales are the basic multiply and divide and are the place to start. Multiply is thought of as adding C to D and dividing is subtracting C from D since you are really adding and subtracting logs. I totally agree that people who originally learned on a slide rule developed an ability to quickly sanity check their results since you have to decide where to put the decimal in any answer so as the other poster said, is it 8.0, 80, or 800? See: [URL="http://www.hpmuseum.org/srinst.htm"]http://www.hpmuseum.org/srinst.htm[/URL] [/QUOTE]

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