440 



THE HUMAN MOTOR 



output. He found that the personal equation of the workers 

 was an important factor. He considered that rest periods of 

 10 minutes duration should be interpolated after 75 minutes of 

 work, and that during the day there should be four breaks during 

 which the girls could walk about and talk to each other. 



336. The Organisation of Bricklayer's Work. The foregoing 

 study of the use of the file has shown that the scientific investiga- 

 tion of the operations of a handicraft can produce economy and 

 augment the yield of work. 



Gilbreth ( l ) studied the work of the bricklayer in the same 

 manner. The results obtained are equally compiehensive and 

 instructive. He also made use of the mathematical method, 

 which consists in studying separately the different variables of 

 the operation under reference. These have been dealt with in 

 Book IV. of the present work as internal and external 

 conditions. 



These conditions, as far as bricklayers' work is concerned, are 

 as follows : 



(1) If the workman is left-handed, the usual positions of the 

 bricks and the mortar will be reversed. All obstacles to rapid 

 execution will be eliminated. The staging (vide fig. 299) will be 



Fig. 299. Suitable staging for bricklayer's work 

 (after Gilbreth). 



arranged to this end. It will be level, and its supports will be so 

 located as to form no obstacle to the movements of the workman. 



( l ) Gilbreth (Motion Study, 1911). 



