File:London Science Museum by Marcin Wichary - Adders and educational toys (2289279897).jpg

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English: Adders and educational toys from the 20th century displayed at the Science Museum, London.
  • 1. The "Addiator" mechanical adder, 1924
“ Until the 1970s echanical adders remained essencially the same as those made in the 19th century, but used new materials and designs. ”
  • 2. The "Alpina" mechanical adder, c. 1955
  • 3. The "Baby" mechanical adder, c. 1950
  • 4. The "Exactus" mechanical adder, c. 1950
  • 5. "Magic Brain" mechanical adder, c. 1960
  • 10. "Tell Bell" educational toy, c 1930
  • 11. Early Learning Centre number balance, c. 1993
Date
Source Flickr
Author Marcin Wichary from San Francisco, U.S.A.
Camera location51° 29′ 51.25″ N, 0° 10′ 29.45″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This image was originally posted to Flickr by Marcin Wichary at https://www.flickr.com/photos/8399025@N07/2289279897. It was reviewed on 27 June 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

27 June 2014

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current21:54, 27 June 2014Thumbnail for version as of 21:54, 27 June 20142,272 × 1,704 (1.19 MB)SunOfErat (talk | contribs)Transferred from Flickr via Flickr2commons

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