Improving the blackboard / by W. Douglas Seymour.

  • Seymour, W. Douglas.
Date:
1938
Catalogue details

Licence: In copyright

Credit: Improving the blackboard / by W. Douglas Seymour. Source: Wellcome Collection.

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    DIAGRAM OF APPARATUS Board-^ L Slip with nonsense syllable Apparatus The boards were the same as those used in the classroom experi¬ ments (section IX below). The test words consisted of nonsense syllables each of which contained three letters and commenced with a stop consonant followed by a vowel in order to ensure a positive action from the voice key. The letters were made with half-inch Unique stencils—that is to say, of half the normal size, owing to the fact that the boards were at approximately half the normal classroom distance. The apparatus occupied practically the whole field of vision, both with the screen open and shut. The neutral coloured board was about three feet square, and centrally placed within it was an aperture nine inches square covered with a double shutter of white cardboard, con¬ taining a central spot for the subject to fixate. The two halves of the
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