Bauhaus-Universität Weimar

Experimental Psychology: A Manual of Laboratory Practice, Vol. II: Quantitative Experiments, part 2: Instructor's Manual
Titchener, Edward B.
Preliminary Experiments 
pared with the photometers of modern physics, the instrument is 
very rough ; but it suffices for the purposes of the present Course. 
Fig. 16. 
Historically, the problems of photometry were of .great im¬ 
portance for psychophysics : see, e.g., G. F. Lipps, Arch. f. d. ges. 
Psych., iii., 1904, 154 ff. And from the point of view of their 
intrinsic importance, photometric experiments are, perhaps, un¬ 
duly neglected in psychological laboratories ; their technique has 
grown to be so refined, and the instruments required are so ex¬ 
pensive, that one is tempted to cast the burden of training and 
outlay upon the physical laboratory, and to appeal to the physicist 
to standardise one’s papers or glasses. The author was, at first, 
disposed to include a § on photometry in this book, but decided 
after consideration that not much more could be done bv the 
student than is called for in Exps. IX. and XII. The Instructor 
will, of course, recommend the reading of Helmholtz, P. O., 1896, 
416 ff., 428 ff., 473 ff. A useful little book is W. M. Stine’s


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