Bauhaus-Universität Weimar

Experimental Psychology: A Manual of Laboratory Practice, Vol. II: Quantitative Experiments, part 2: Instructor's Manual
Titchener, Edward B.
The Metric Methods 
logie d. Veränderungsauffassung, 1898. At the same time, it 
can hardly be made the subject of set experiments in a book like 
the present. The work is difficult ; the time required for any¬ 
thing like a satisfactory result is long; questions of method and of 
evaluation still remain unsettled ; and the student must, in any 
case, learn the regular methods first. All that the author can do, 
therefore, is to give some account of apparatus, and references to 
the investigations so far made. If there are students in the lab¬ 
oratory who have completed the prescribed course, and who de¬ 
sire to take up a bit of work that shall occupy them, say, for three 
months, they may very well be recommended to one or other of 
the following problems. 
(1) Visual Sensation. The best instrument for ordinary laboratory 
use is the Marbe colour mixer (Fig. 23), which allows A to vary the rela- 
Fig. 23. 
tion of two disc-sectors during rotation. A set of directions may be ob¬ 
tained from E. Zimmermann. The mixer is made in two forms, costing 
respectively (without motor) Mk. 115 and Mk. 155. 
For instruments, methods, etc., cf. A. Koenig and C. Dieterici, Z., iv., 
1892, 244; L. W. Stern, Z., vii., 1894, 249 ff., 395 ff. ; K. Marbe, 
Physiol. Centralblatt, 1894, no. 25, 811 ; C. E. Seashore, Yale Stud., 
iii., 1895, 38 ff. ; O. Lummer and E. Brodhun, Z. f. Instrumentenkunde, 
xvi., 1896, 305. Cf. vol. i., I. M., 17. 
(2) Visual Movement. Lines, points, figures, etc., may be drawn or 
pasted upon an ‘ endless ’ strip of paper travelling between two kymo¬ 
graph drums.


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