Witch, or the Wolverhampton Instrument for Teaching Computing from Harwell, was based on telephone exchange relays and 900 Dekatron gas-filled tubes, which could each hold a single digit in memory.

Built in 1951, the Harwell Dekatron was originally used at the Atomic Energy Research Establishment at Oxfordshire. It multiplied numbers, replacing work that had previously been done by adding ...

Sometimes people who build nixie clocks add one dekatron as a seconds counter, which is nice, but I wanted something new. In this article I am presenting the 7-band stereo audio spectrum analyser with ...

40 LEDs. Some 1960s inspiration. And a dash of style. I have designed a retro look clock which displays the time using four "wheels" of LEDs arranged in groups of ten. Each LED therefore represents a ...

Richard "Dick" Barnes helped to create the Harwell Dekatron, which was first put to use in 1951 by Britain's fledgling nuclear research establishment. He was also involved in the 2.5-tonne machine ...

The Harwell Dekatron, also known as the WITCH, can be found at the National Museum Of Computing in Bletchley, UK, and [David Anders] is building a modern all-electronic replica of it. The original ...

His images and captions, below. The Harwell Dekatron The Harwell Dekatron, also known as the Wolverhampton Instrument for Teaching Computing from Harwell (WITCH), is an early British relay-based ...

His images and captions, below. The Harwell Dekatron, also known as the Wolverhampton Instrument for Teaching Computing from Harwell (WITCH), is an early British relay-based computer created in the ...

Harwell Dekatron: The Harwell Dekatron, also known as the Wolverhampton Instrument for Teaching Computing from Harwell (WITCH), is an early British relay­based computer created in the 1950s.

There was a time not so long ago when computers were not thin, stylish, devices you slip into a pocket or wear on your wrist, but enormous, fabulous machines with flashing lights and spinning fans.

The Portrait of a Dead WITCH was painted in 1983 by John Yeadon after he had seen the original machine, the Harwell Dekatron / WITCH computer, in Birmingham’s Museum of Science and Industry.