Museum Homepage

The San Mateo County Historical Association
Online Collections Database

The mission of the San Mateo County Historical Association is to inspire wonder and discovery
of the cultural and natural history of San Mateo County.

Object Record

  • Email This Page
  • Send Feedback
Catalog Number 2014.021.002
Description Magic Brain Calculator, c. 1950-1969, includes calculator (A), stylus (B), instructions for use (C) and original box (D). Calculator (A) is a durable red plastic with a tin metal plate mounted to the top by six small circular rivets. Printed on tin plate is "Chadwick" in red and "MAGIC-BRAIN / CALCULATOR / + - x" in black. Below name are 8 open boxes with black rotating numbers on a white ground; numbers correspond to 8 vertical openings below with red-colored tin that is notched and slides up and down with use of stylus. Steel metal stylus (B) is secured to right side of calculator by four extended plastic pieces. At top of calculator is a steel wire bar that is curved at center, just above a small notch in the metal plate. This is for a finger hold and when the bar is raised, all numbers in the white boxes revert back to zero. "Simplified Instructions … Printed in Japan" (C) consist of a white piece of paper with black colored print on one side. Heading of sheet include: "HOW TO CLEAR THE MACHINE," "HOW TO ADD," "HOW TO SUBTRACT," "HOW TO MULTIPLY" and "AIDS DIVISION, TOO." Cardboard box (D) is red, blue and gold with white print and an image of the calculator on either side.
Object Name Machine, Calculating
Collection 3D - Data Processing Tools & Equipment
Title Magic Brain Calculator, c. 1950-1969
Date c. 1950-1969
Creator Chadwick, Japan
Role Manufacturer
Inscription Text (see description); "Chadwick / MAGIC BRAIN / CALCULATOR" (printed at top of front and back of box inside red section); "NEVER MAKES A MISTAKE! / ADD or SUBTRACT / & MULTIPLY / UP TO 99,999,999" (printed on front of box in white letters); "EASY TO USE! / SAVES COSTLY ERRORS! / SAVES TIME! / IDEAL FOR / BUSINESSMEN / SALESMEN / HOUSEWIVES / ACCOUNTANTS / STUDENTS" (printed on back of box in white letters); "MAGIC BRAIN CALCULATOR" (printed on both sides of box in white letters); "JAPAN" (stamped in purple ink on bottom of box)
Dimensions H-5.75 W-3.5 D-0.25 inches
Dimension Details Calculator (A) is 5.75x3.5x.25" with stylus (B); instruction sheet (C) is 8.625x3.625"; box is 6x3.25x.5
Search Terms 1950's American Culture
Adding Machine
Subjects Calculators