Bryn Mawr College monographs . In constructing the above charts the figure expressing the abilityto sustain clear seeing during the three-minute record before andafter work is plotted along the ordinate and the hours of workalong the abscissa. These two points are connected bv a straic^htme the slope of which gives a graphic representation of the chano-en the power of the eye to sustain clear seeing from the the end of the three-hour period. During the workina periodtie observer read steadily from uniform type and paper. In theElection and use of the observers for the work the foll
Bryn Mawr College monographs . In constructing the above charts the figure expressing the abilityto sustain clear seeing during the three-minute record before andafter work is plotted along the ordinate and the hours of workalong the abscissa. These two points are connected bv a straic^htme the slope of which gives a graphic representation of the chano-en the power of the eye to sustain clear seeing from the the end of the three-hour period. During the workina periodtie observer read steadily from uniform type and paper. In theElection and use of the observers for the work the followino- areJ^tne of the precautions that were taken. Care was exercised inne first place to choose only those that had alread^• shown a satis-actoiy degree of precision in other work in physiological opticsni whose clinic record showed no uncorrected defects of conse- Ferree and Rand. quence. All were under 30 years of age. Before being allowedto take part in the actual work of testing, each observer was trainedto a satisfact
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Keywords: ., bookauthorbrynmawr, bookcentury1900, bookdecade1900, bookyear1901
