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General Software Discussion / Re: The ultimate piece of retro-computing
« on: February 16, 2009, 08:53 AM »
The slide rule pictured shows 62, not 61, which is correct within the precision limitations and very close to the correct answer (62.1). It appears that whoever read the answer mistook the fractional markings between 6 and 7 for 10ths (.1), when they are actually 5ths (.2).
The Graphoplex slide rule I used in physics classes in France in the 1960's (and which I still have, although I haven't used it in decades) had a magnification attachment that allowed you to interpolate an extra digit of precision, as well as scales for squares, cubes, natural logs, trigonometric functions and more.
Slide rules have one advantage over electronic calculators in that they show a range of answers at once, which makes them much faster for quick planning purposes. The inexpensive quick calculators often given out as promotions by banks and financial planners, or at trade shows, are just special purpose slide rules.
The Graphoplex slide rule I used in physics classes in France in the 1960's (and which I still have, although I haven't used it in decades) had a magnification attachment that allowed you to interpolate an extra digit of precision, as well as scales for squares, cubes, natural logs, trigonometric functions and more.
Slide rules have one advantage over electronic calculators in that they show a range of answers at once, which makes them much faster for quick planning purposes. The inexpensive quick calculators often given out as promotions by banks and financial planners, or at trade shows, are just special purpose slide rules.