

A small collection of mechanical calculators, the forgotten and unloved predecessors to modernday electronic computing equipment.
Unloved? These were the machines that gave rise to phrases like "cranking out the numbers", an expression of the tedium of working through calculations or spending one's days summing accounts with them. Even today, they don't seem to attract the same degree of interest or appeal as the spaceagey electronic calculators.
R.C. Allen 805
Keyset Adding Machine
1930s ?
Functions:  Add, subtract, accumulate 
Drive:  Crank 
Keypad:  Full 
Digits:  8/8 
Display:  Dial, paper tape 
More Photos:  Yes 
Status:  Fully functional except for problem with depressing total keys after carry (see repair 2013 Feb 03). 
Lagomarsino 8361
Electromechanical Adding Machine
1950s ?
Functions:  Add, subtract, accumulate, multiply 
Drive:  Electric 
Keypad:  10key 
Digits:  13 
Display:  Paper tape 
Status:  Jammed. 
Olivetti Multisumma 22
Electromechanical Adding Machine
1950s ?
Functions:  Add, subtract, accumulate, multiply 
Drive:  Electric 
Keypad:  10key 
Digits:  12 
Display:  Paper tape 
Status:  Addition functional. 
Victor Comptograph
Electromechanical Adding Machine
1960s ?
Functions:  Add, subtract, accumulate, multiply 
Drive:  Electric 
Keypad:  10key 
Digits:  12 
Display:  Paper tape 
Status:  Needs drive belt. 
Friden SBT10
Keyset Electromechanical Calculator
1964 (introduced 1959)
Functions:  Add, subtract, accumulate, multiply, divide 
Drive:  Electric 
Keypad:  Full 
Digits:  10/20 
Display:  Dial 
More Photos:  Yes 
Status:  Jammed. 
Hermes 30910
Electromechanical Adding Machine
1969
Functions:  Add, subtract, accumulate, multiply 
Drive:  Electric 
Keypad:  10key 
Digits:  10/11 
Display:  Paper tape 
Status:  Fully functional. 
Mechanical Calculators  bhilpert 2013 Feb 