Dividers & CompassesProportional Dividers
Unlike regular dividers, proportional dividers have points at both ends. A screw and nut slide along a slot within the legs to allow the instrument to be opened into an "X" shape. The user then tightens the screw at a particular proportion in order to make scale drawings, such as for engineering or architecture. Proportional dividers are especially helpful when the drafter must change between several different scales. However, for one of these objects, there was only one desirable proportion, the so-called "universal ratio" of 5.333:1. Maurice Kidjel, a Hawaiian artist and inventor, sought out and received publicity for his device in the 1960s.
"Dividers & Compasses - Proportional Dividers" showing 1 items.
- The citation information for this spiral-bound book is: Maurice Kidjel, The Kidjel Ratio System 5.333/1 (Honolulu, 1962). It was received with an example of Kidjel's Cali-Pro proportional dividers (MA*333876), and a warranty card for the Cali-Pro is inside the front cover of the book. After a biographical note, Kidjel provided supposed solutions to the three classic construction problems of Greek antiquity (trisecting the angle, squaring the circle, and doubling the cube).
- Although the Cali-Pro was not needed for these attempted solutions, in part two of the book Kidjel explained how to make these and other, more standard, solutions with the device. Next, he discussed how his ratio applied to the human body. Finally, he explained how to use the Cali-Pro in various fields of industrial design, such as architecture and publishing. A brief biography of Kidjel's business partner, Kenneth W. K. Young, is found inside the back cover. The back cover reproduces a portion of then-U.S. Representative Daniel Inouye's remarks about the Kidjel ratio system, read into the Congressional Record of the 86th Congress.
- Currently not on view
- date made
- Kidjel, Maurice
- Young, Kenneth W. K.
- ID Number
- accession number
- catalog number
- Data Source
- National Museum of American History, Kenneth E. Behring Center