Image:AnitaMk8Inside1.jpg

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Description

Inside an operating Anita Mk VIII (aka Mk 8) electronic calculator, which together with the Anita Mk VII were the world's first electronic desktop calculators when launched in 1961.

This photograph shows -

  • The display on the right with a dozen "en:Nixie"-type numerical indicator tubes, each mounted on the edge of a counter board.
  • The daughter boards in the centre holding many en:cold-cathode switching tubes. Some of these are lit up (like neon lamps, to which they are related), which shows that they are in the "on" state.
  • A GS10D Dekatron decade counter tube at top left (with a red mark on top), which is used to scan the keyboard for pressed keys.
  • Two ECC81 double-en:triode en:vacuum tubes (thermionic valves) to the right of the Dekatron.
  • Many en:Selenium en:diode packs, which are the black rectangular blocks.

Warning: there are dangerously high voltages exposed when operating one of these machines like this with the covers open.

Photograph taken by myself of a machine in my collection.
Source

Originally from en.wikipedia; description page is/was here.
Date

2007-04-28 (original upload date)
Author

Original uploader was MaltaGC at en.wikipedia
Permission
(Reusing this image)

Licensed under the GFDL by the author; Released under the GNU Free Documentation License.

[edit] License information

MaltaGC, the copyright holder of this work, has published or hereby publishes it under the following license:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation license, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation license".

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[edit] Original upload log

(All user names refer to en.wikipedia)

  • 2007-04-28 19:02 MaltaGC 728×800×8 (145356 bytes) Inside an operating Anita Mk VIII (aka Mk 8) electronic calculator, which together with the Anita Mk VII were the world's first electronic desktop calculators when launched in 1961. This photograph shows - *On the right is the display with a dozen "''[[N

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current05:29, 10 August 2007728×800 (142 KB)Webaware ({{Information |Description=Inside an operating Anita Mk VIII (aka Mk 8) electronic calculator, which together with the Anita Mk VII were the world's first electronic desktop calculators when launched in 1961. This photograph shows - *The display on the r)
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