Validity of Ergograph as Measurer of Work Capacity 1 3 



tions the previous year and was therefore not unfamiliar with 

 the work. The previous work will be included in this discussion. 



The experiment continued over a period of more than three 

 months, from January 27 to May 9. Periods of work of 5 to 

 20 days were alternated with periods of rest of 4 to 15 days. 

 When two records were taken daily the first one came between 

 9:30 and 10:30 a.m. and the second at about 2 p.m. When one 

 record a day was taken it came in the morning at the hour indi- 

 cated. The time remained constant within reasonable limits. 



For a record, the contractions of the finger were made every 

 two seconds to the beat of a metronome until a movement was no 

 longer possible. After a pause of a minute a new fatigue curve 

 was written, which was followed, after a second pause of one 

 minute, by a third. In the latter part of the experiment the 

 number of exhaustions was increased to six, and the pause 

 lengthened to two minutes. The records are given in the num- 

 ber of millimeters the weight was lifted during the three periods 

 of work constituting a test. 



No attempt was made to adhere closely in the daily habits to 

 a regular plan of living. However, all unusually trying and 

 fatiguing entertainments or diversions were interdicted as far 

 as possible during the periods of work, so that we can regard 

 the mode of life for the reagents, while the observations were 

 being made, as reasonably normal and free from unusual strains 

 or excitements. 



Table I 



In the following table, part I, are given all the records taken 

 upon each reagent between January 27 and April 17. We have 

 in the first column for each reagent the total height the weight 

 was raised in mm. for either hand, in the second column the 

 number of contractions, in the third the average height of the 

 contractions, and in the fourth the average performance increase 

 or decrease. The increase and decrease are indicated respec- 

 tively by the plus and minus signs. Five periods of work sep- 

 arated by four pauses are shown. In the second part of the table 

 are given the averages for the total height of lift, of the numbers 

 of contractions and of the averages of the heights of contraction 

 for each of the five periods of work. 



9* 



