[Unrepentant VN Vet]

Got a couple of late additions to this “Obsolete Technology” list:

1) Sliderule - Invented in the 1600’s, largely obsoleted by pocket calculators about 1974 and mine just returned to me by grandson after completion of his homeschool math project. (Really handy in remote job locations when I want to continue work after a power outage and sometimes used by grandkids to scare **** out of public school “mathematics teachers”.)

2) Adobe Flash - In use for at least past ten to fifteen years (including by the folks publishing this article) but fallen into disuse over the past two years due to security failures.

[GingisK]

I still have my Post Versalog and its hard cover manual.

[PROCON]

My Dad, a Boeing engineer starting in the late '40's, always relied on his slide rule until HP scientific calculators became mainstream among the engineer class.

I still have his HP-67 which was the scientific calculator of the day with engineers and other math nerds. The HP-67 owners manual is as thick as the LA phone book.

Good times.

[dangerdoc]

My father taught me to use a slide rule when I was in grade school probably around 1970. Told me I would never make it anywhere in life without knowing how to use a slide rule.