Hewlett Packard HP-35
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Hewlett Packard HP-35
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- Type: RPN Electronic Calculator
- Size: 3 x 6 in / 8 x 15 cm
- Serial number: 1230A89362
- Date of Manufacture: July 1972
With leather case, manual, several battery packs in need of rebuild and two different versions of the 82002A charger/adapter.
The slide rule was invented in 1622 and lasted until . . . 1972. That year Hewlett Packard introduced the HP-35. A tool that had been used for 350 years completely disappeared in less than one percent of that time. Readers are invited to write in with examples of a faster obsolescence.
Here it is: the slide rule killer.
For people who follow such things: This calculator has no hole to display the red dot indicating power on, it does have a bump on the 5 key and the label lacks the model number. This is the "type 2b" HP-35. The 1230 serial number prefix places this unit in the first batch to be released to retailers. The "2.02 ln ex" bug is absent.
I seem to be the second owner of this unit. The first owner bought it in July 1972 and used it until retirement in 1993. I purchased it from his stepdaughter in 2006. Included with the unit was a set of program cards including economics and statistics algorithms. The HP-35s weren't programmable, but their owners often had need to run programs nonetheless. The HP-35's accuracy was checked by hand as the mainframe computers of the time weren't up to the task.
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