Cardboard Doll Tests Machine Designs
SPECIAL machinery for use in the manufacture of telephones by a great Eastern company is now being tested, when still in the design stage, by cardboard dolls.
A cardboard doll with movable arms, legs and head, correctly jointed, has been carefully drawn to scale. It is made one fourth the size of the average man, as this is the scale to which most machine drawings are made.
In machine design, it is important to insure that the parts of the machine be convenient and accessible; to have the levers within easy reach, for instance, and sufficient head clearance. The manikin, placed upon the machine drawing, shows instantly how well a real operator can run the machine. By any other method, the design may be checked up only by actual operation or by tedious, time-wasting measurement.
The joints of the body have been scientifically located, for the figure must be made to bend forward and backward just as the real operator would do.