(2) The experimenter was provided with a record-sheet on which the time of the intervals numbered from 1 to 16 was given. Care was taken that the subjects should not know the length of the intervals before the experiments.
(3) The beginning of each interval was indicated to the subjects by the word "start" uttered distinctly by the experimenter; the end, by the word "stop."
(4) Before beginning the sixteen tests the experimenter gave a thirty-second interval as a standard of judgment. The experiment then proceeded with only sufficient pause between judgments to allow of the recording of estimates by the subjects.
(5) During the filling called "idleness" the subject did not pay special attention to the estimation of the time, but instead permitted his attention to wander.
(6) During "reading" the experimenter read aloud to the subjects.
(7) During "writing" the subjects wrote from the dictation of the experimenter.
(8) During "estimating" the subjects judged the interval as accurately as they could, by whatever method they chose except the use of a time-piece.
(9) Each subject recorded his judgment of the length of an interval in seconds at the appropriate place on the record-sheet as soon as the interval was ended.
(10) The question following judgment number 16 on the sheet was answered as soon as the sixteen judgments had been recorded.