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On the Isospingroup in the Theory of the Elementary particles
CERN-ARCH-WP CERN-ARCH-PMC-CERN-ARCH-PMC-01-* CERN-ARCH-PMC-01-054 * 96800 · Item · 1905-05-10 - 1905-05-11
Part of Pauli Manuscript Collection

Second edition of this manuscript. In conclusion: "Quite generally the present paper is meant rather as a program than a report on what is hoped to become a unified quantum field theory."

 Heisenberg, Werner Pauli, Wolfgang
One of the First Portable Macs
One of the First Portable Macs
Heritage collection CERN-OBJ-CERN-OBJ-IT-030 · Item · 1989
Part of Heritage Collection Test

It was one of the first portable macs released. The Portable had many new advances in mobile computing : The display was crispy clear, and looked beautiful when used in daylight ; The Portable came with a Lead-acid gel/cell battery that could run a anywhere from 6 -12 hours ; It supported to internal hard drives, and an external one. The reaction to the laptop was weak because it was slow, it had no capacity for expansion, it weighed heavily, its price was expensive. It has been stayed 1 year and half on the market.
OPAL Central Detector (Including vertex, jet and Z chambers)
Heritage collection CERN-OBJ--CERN-OBJ-DE-056 · Item
Part of Heritage Collection Test

OPAL was one of the four experiments installed at the LEP particle accelerator from 1989 - 2000. OPAL's central tracking system consists of (in order of increasing radius) a silicon microvertex detector, a vertex detector, a jet chamber, and z-chambers. All the tracking detectors work by observing the ionization of atoms by charged particles passing by: when the atoms are ionized, electrons are knocked out of their atomic orbitals, and are then able to move freely in the detector. These ionization electrons are detected in the different parts of the tracking system. (This piece includes the vertex, jet and Z chambers) In the picture above, the central detector is the piece being removed to the right.