On 3/30/2010 8:37 PM, Swingman wrote:
On 3/30/2010 6:53 PM, Keith Nuttle wrote:

My favorite slide rule was the circular slide rule. For some spectra
conversion in IR or UV you could make the calculation on the circular
slide rule faster that any calculator today.

Do you remember your first electronic calculator? I got a TI-30 (IIRC)
when I went back to school briefly after the service. We weren't even
allowed to bring them to class, much less take a test with it.

TI-30? That is only about 20 years old. The electronic calculator I am
talking about was bought in 1970. It had a big nixy(sp?) display and
was the size of a typewriter. It was significantly better that the old
mechanical one. It did X / + - and had 12 rows of 10 keys in each row.
Took several seconds to do simply + and - calculations and longer to
do X and /.