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3. Magnet - Wikipedia

   en.wikipedia.org/wiki/Magnet

   A magnet's magnetic moment (also called magnetic dipole moment and usually denoted μ) is a vector that characterizes the magnet's overall magnetic properties. For a bar magnet, the direction of the magnetic moment points from the magnet's south pole to its north pole, [ 15 ] and the magnitude relates to how strong and how far apart these poles ...

4. HP-67/97 - Wikipedia

   en.wikipedia.org/wiki/HP-67/97

   The built-in magnetic card reader/writer could be used to save programs and data, with the ability to combine data from multiple cards. The same magnetic card format was later used for the HP-41C which offered compatibility to the 67/97 through software in the card reader. HP offered a library of programs supplied on packs of pre-recorded ...

5. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

6. Forrest Parry - Wikipedia

   en.wikipedia.org/wiki/Forrest_Parry

   Forrest Corry Parry (July 4, 1921 – December 31, 2005) was an American IBM engineer who invented the magnetic stripe card used for credit cards and identification badges. [ 1 ] [ 2 ] Early life

7. Magnetic-core memory - Wikipedia

   en.wikipedia.org/wiki/Magnetic-core_memory

   The first use of magnetic core was in the Whirlwind computer, [19] and Project Whirlwind's "most famous contribution was the random-access, magnetic core storage feature." [20] Commercialization followed quickly. Magnetic core was used in peripherals of the ENIAC in 1953, [21] the IBM 702 [22] delivered in