Electromechanical calculating machines from the 1960's
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Rotary calculators
 Badenia VA-17
Badenia VARE-17
Bohn Contex 55
Cellatron R44SM
Diehl DSR-18
Diehl VSR-18
Facit CA1-13
Friden SBT
Friden SVE
Friden SRW
Friden SRQ
Friden RSR
Hamann 505
Madas 20 BTG
Marchant ABL
Marchant SKA DeciMagic
Marchant Tenkeymatic
Monroe IQ-213
Olympia RA-16
Soemtron 214

Printing calculators

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Friden RSR        
 
Manufacturer
   Friden Inc.
San Leandro, California, USA
 
Mechanism
   stepped drum
 
Capacity
   10 x 11 x 20
 
Years produced
    
 
Price when new
   $1195 in 1967
 
Size (W x D x H)
   in.
cm.
 
Weight
   lb. oz. (kg)
 
Features
   automatic squaring
automatic square root
  click on photo to enlarge    
         
This machine is the last square root electromechanical Friden, produced only from 1966 to 68. It is very similar mechanically to the SRQ, but incorporates several detail refinements. For example, some differences can be seen in the area of the carriage where it interfaces with the square-root mechanism. The die-cast housing is the same as the ill-fated V-line Fridens and completely different from the sheetmetal stampings used for the SRQ. By the time this machine came on the market, Friden was already producing an electronic alternative, the Friden 132. From Los Alamos (Admin Mgmt)