History of Psychology Collection

Vision Research Apparatus

L.E. KNOTT APPARATUS CO. SINGLE-AXLE COLOR MIXING APPARATUS

This device used a large pulley turning a small pulley to increase the rotational speed of a stimulus wheel beyond what could be achieved by direct hand rotation. Wheels with different combinations of colors were used to demonstrate the principles of color mixing. Wheels with black and white patterns were used to demonstrate motion aftereffects and to produce colors using Bentham's patterns. It was manufactured by L. E. Knott Apparatus Co., Boston, Mass.

 

MILTON BRADLEY TWO AXLE COLOR MIXING APPARATUS

This device used two large pulleys turning two small pulleys to increase the rotational speed of a stimulus wheel beyond what could be achieved by direct hand rotation. The two axle color mixing apparatus could achieve much higher speeds than the single axle version. Wheels with different combinations of colors were used to demonstrate the principles of color mixing. Wheels with black and white patterns were used to demonstrate motion aftereffects and to produce colors using Bentham's patterns. It was manufactured by Milton Bradley Co., Springfield Mass., and was patented Feb 28, 1893.

 

STRATTON PRISMATIC GOGGLES
Stratton used prismatic goggles to shift the direction of his subjects' view. These toy prismatic goggles were used at Barnard to demonstrate the effect. The prisms can be rotated independently through a full 360 degrees.

 

STEREOSCOPIC PHOTOGRAPH VIEWER

This device was used to demonstrate stereoscopic vision.