Electromechanical calculating machines from the 1960's
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Rotary calculators

Printing calculators
Friden 1217
Lagomarsino Totalia S4GT
Marchant 416-S
Monroe 570
Monroe 580
Monroe Mach 1.07
Monroe PC-1421
Olivetti Divisumma 26
Olivetti Logos 27-2
Olivetti Tetractys
Precisa 166
Victor 73-85-54
Victor 79-88-54
Victor 10-871
Walther Diwa 32



Other calculating devices

References and links



Olivetti Logos 27-2        
  Ing. C. Olivetti & Co., S.p.A.
Ivrea, Italy
  oscillating rack
Years produced
Price when new
Size (W x D x H)
  lb. oz. (kg)

shortcut high speed multiplication
three memories

back transfer

  click on photo to enlarge    

The Logos 27 is the culmination of twenty years of Olivetti printing calculator development. Almost twice the size and weight of the Divisumma range, it is also twice as fast. During multiplication and division, the Logos operates at 600 cycles per minute. It also has three memories, each serving a slightly different function. Natale Capellaro was in charge of the mechanical design, and the industrial design was by Ettore Sottsass.

This machine made its debut at the Business Equipment Manufacturers Association (BEMA) show in New York in late 1965. A large booth was dedicated to the new machine, with the new, fully electronic Programma 101 relegated to a small corner display. Within a few years, the electronic calculator had taken over the market, and Olivetti offered large trade-in allowances for the Logos 27.

This is the largest and heaviest machine in the collection.

My sincere thanks to Martin Löfgren for the donation of this machine