## Getting Old

At times your age gets thrust into your face.  (like when you get your first AARP mailing).  Well I had one of those moments.  My favorite pencil is a Pentel P205, 5mm mechanical pencil. (The black one).  Well I had to chage to the P207 (The blue one) because my hands are not steady enough for the finer lead.  Oh well.  I have an older engineer friend that is so vain, he took the hardware out of the P209 (yellow one) and put it into the black one so it looks like he is still using a young persons pencil.

I am finding that now, most of the people I work with do not know how to use a slide rule.  10 years ago it was only some.  How could you ever undertand interpolation if you never used a sine table.

## Comments

As I presume you will also have learnt to do calculations using logarithms. In those old times a joke was told:

An engineer, a mathematican and a n analytical chemist were asked to calculate four times four.
The engineer immediately took out his pocket slide ruler, shifted a bit on it and answered "It is about 16".
The chemist pulled out his logarithm-table (Briggs) wrote down something on a sheet of paper, flapped again through the small book and answered "It is 15.9999".
The math guy started to write on several sheets of paper, asked for some more sheets, wrote and wrote... Then with a broad smile on his face he declared "I've got it!!! I really got it!!! To this problem there exists a single solution only!".

When you have heard (and understood) this joke before you are old! Pocket calculators came in in 1972, so when you was neither tortured in school with logarithms nor with slide rulers (estimation sticks we called them) you are really old.

But you have learnt to estimate numbers!

But I got my first AARP mailing when I was in my 30's!

Yes! Exactly what I suspected: Pure mis-estimations and not controlling the results of the pocket-calculator!

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