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
Quote:
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 SR16 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.
BA55
Business Analyst
Business Analyst  I
Money Manager
MBA
My HP 17BII 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:
HP10B
HP12C
HP22
HP38E
TI and HP seem to agree that business people don't need trigonometry, and with the exception of the HP17BII 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 handheld calculators but appeared much earlier in the slide rule technoilogy. For example:
The K&E 40953 Merchant's Duplex in my collection was originally made available in 1927.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The K&E 4094 Merchant's Mannheim in my collection was originally made available in 1936.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 FaberCastell 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 400H 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.
