Pulfrich stereo comparator 1904

Pulfrich's stereo-comparator, 1904: the two photographs are placed on the plates, and viewed through the binoculars to reveal the 3D image in the mind of the viewer. The apparatus allows the viewer to measure dimensions across (X axis) and up-and-down (Y axis), but also height (Z axis).

Pulfrich’s stereo-comparator, 1904: the two photographs are placed on the plates, and viewed through the binoculars to reveal the 3D image in the mind of the viewer. The apparatus allows the viewer to measure dimensions across (X axis) and up-and-down (Y axis), but also height (Z axis) (image via Max Planck Institute for the History of Science).

Pulfrich’s stereo-comparator, 1904: the two photographs are placed on the plates, and viewed through the binoculars to reveal the 3D image in the mind of the viewer. The apparatus allows the viewer to measure dimensions across (X axis) and up-and-down (Y axis), but also height (Z axis).

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