The Logos 27 in four articles.

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> The "Logos" and the calculator market

Article by Francesco Mascaro of the Olivetti Studies Center.

> The "Logos" project
A note by Teresio Gassino, who designed this machine along with a group of collaborators.

> The design of the "Logos"
Article by architect Ettore Sottsass jr., who conceived the exterior of the new Olivetti calculator.

> Where the "Logos" is made

 

Source: Notizie Olivetti, n. 85, dicembre 1965, Ufficio Stampa Olivetti, pp. 32-49, free translation of the titles.

Logos 27-2, brochure (1967). The brochure for the Logos 27-1 (1966) can be retrieved here in Dutch language, with graphical work by Giovanni Pintori. A video sequence presented the Logos along with other Olivetti products.

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Source: Olivetti Logos 27-2: Internet Archive, Olivetti Logos 27 by Pintori: Letterform Archive retrieved November 2020.

Philippe Bastide, "Ranimer une belle mécanique" ("Reviving a piece of beautiful mechanics"). Extraordinarily detailed analysis and reverse engineering of a Logos 27 to put it back to working order, by an engineer and calculating machines enthusiast. Alain Billerey's expertise contributed to this work: an enthusiast himself and collector of such machines (here showing Logos, Divisumma and Tetractys from his collection in operation).

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​Source: L'oeil numérique (Internet Archive) archived July 2019.

The Logos in operation. An engineer and a mechanical calculating machines enthusiast, Emanuele Vanzetti shows in operation the Logos 27-1 from his personal collection.

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Source: video courtesy of Emanuele Vanzetti, flow chart from the brochure for the Logos 27-2 (see above).