|Stretching the memory|
Message #7 Posted by Palmer O. Hanson, Jr. on 18 Jan 2007, 10:14 p.m.,
in response to message #4 by GE
He he, if you want to stretch the memory, can you tell if there was ever a TI model with logs but no trigs ? If yes, which one ?
(easier one) : same questions on the HP line
(harder one) : same for Casio
My SR-16 II offers ln, log and e^x but not trigonometric functions..
The following TI's in my collection offer ln and e^x but do not offer log or the trigonometric fuynctions.
Business Analyst - I
My HP 17B-II offers ln, log, e^x and 10^x but does not offer trigonometric functions.
The following HP's in my collection offer ln and e^x but do not offer log or the trigonometric functions:
TI and HP seem to agree that business people don't need trigonometry, and with the exception of the HP-17B-II business people don't need 10^x. The idea that business people don't need trigonometric functions on their calculating machines was not new with electronic hand-held calculators but appeared much earlier in the slide rule technoilogy. For example:
The K&E 4095-3 Merchant's Duplex in my collection was originally made available in 1927. It is a duplex configuration but it carries only four scales on rhe front (DF, CF, C and D) and two scales on the back (CI and D).
The K&E 4094 Merchant's Mannheim in my collection was originally made available in 1936. It is a closed frame configuration but carries only five scales on the front (DF, CF, CI, C and D). There are no scales oin the back of the slider.
I also have a Faber-Castell 67/22R which is a closed frame slide rule with an Addiator on the back. I believe these became available in the late 1960's or early 1970's. It has five standard scales on the front (DF, CF, CI, C and D.) It has three additional scales on the front of the frame. One can be used to find per cent. The other two provide monetary conversions.
Finally, I have a Picket 400-H Business which is a duplex slide rule with with seven standard scales on the front (K, A, B, CI, C, D and L.) The back has four standard scales (DF, CF, C and D) plus three per cent scales.