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Instrument for Investigating the Power of the Eye to Compare Lengths [Augenmassapparat]

  Source   [Ruf, C.]. 1892. Münsterberg's Laboratory in Freiburg, Germany. Photograph. (Harvard University Archives - HUP Munsterberg, Hugo, 1BP, box 13) view the source
  People   Elbs, Hermann (1861 - 1936)
  Sites   Psychological Laboratory, University of Freiburg (1891)
  Related Literature   Elbs, Hermann. 1895. Abzug der Instrumente. Freiburg (Collection Rand B. Evans),
Appendix, on table 1 (no. 1).
Krohn, William O. 1891. Facilities in Experimental Psychology at the various German Universities. American Journal of Psychology 4: 585-594, on p.588.
  Comment   Krohn (1891, see related literature) describes the instrument as follows:
"3. Augenmassapparat. This consists of a wooden board about 600mm. long and 500 mm. high, standing upright on its side edge. It is covered with very dark green felt, since this color is less fatiguing to the eye. At the back of the board are two scales, one vertical, the other horizontal. These scales are sliding and divided into millimeters. By turning a screw, the scale, either vertical or horizontal, may be moved, and in moving the scale the two white points on the front of the board are moved nearer to each other or away from each other at will. The exact distance can be read in millimeters by referring to scale on the back. The subject is made to judge distance moved as compared to a certain norm or standard given at the beginning of each test. Thus the method of average error is the one employed. Miinsterberg has made over 30,000 tests with this piece of apparatus."
  Description  
ISSN 1866-4784: reference - xlink