What Kind Of Ruler Is This?

By Lawrence

While doing clean up I found this ruler. I got this from my father back in 1970s.

Do you know what it is?

ruler_1960s

Will post the answer tomorrow.

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Comments
  • Lawrence Chan March 12, 2013 at 8:52 am

    It is a 6 inch mini slide rule =)

  • mel March 12, 2013 at 10:05 am

    Interesting

  • geosing March 20, 2013 at 8:24 pm

    Missed this one. Didn’t see it or I would have won the prize. 🙂 I still have the one I used when in school (a 10″ Faber Castell from Germany – cost an arm and a leg in those days, as a German imported product). I guess your dad and I went to school at the same time – before calculators, if any one knows what those are – leave alone a slide rule. 🙂

    I am reminded of a joke about grandpa showing a leather bound book to his grandchild – who then asks with a puzzled look … how do you turn this darn thing on?

    🙂

    • Lawrence Chan March 20, 2013 at 11:39 pm

      nice one! =)

    • Lawrence Chan March 20, 2013 at 11:44 pm

      He is about your age. I remember using the slide rule in exams where the teachers forbid the use of calculators. They don’t even know what the ruler can do. =P

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