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Published online by Cambridge University Press: 01 January 2025
The instrument to be described was developed from apparatus the original design of which, by Landahl and Bechtoldt, was unpublished. Its function is to measure the times of simple reaction, choice, perception of projected patterns, and perception of dim patterns after light adaptation. It may also be used to time verbal response to multiple-choice material when combined with the response relay described by Libby elsewhere in the present journal.
The complete instrument, including chronoscope, subject keys, and experimenter keys, may be carried in a case ll"x6.5"x6.5". The chronoscope, M, occupies the left half of the case. The upper half of the right-hand section serves for carrying the subject key (H) or, as shown in the accompanying cut, the microfilm container and projector slides. All remaining apparatus is in the lower half of this compartment.