After a final schedule has been decided upon, the time given each employee can be made sufficiently conspicuous by going over the lead-pencil marks with crayon or ink. A chart of this nature posted on the bulletin board of an office would serve as a convenient means of giving information to the employees as to their respective vacation periods.

Fig. 56 (page 52) illustrates a method regularly used by Mr. H. L. Gantt to indicate conditions in a manufacturing plant. This particular chart was drawn to show progress made in training the employees of a worsted mill under scientific management. Trained employees

TIME CHARTS 55

may earn a bonus by completing a certain quantity of work each day. It will be seen at a glance that the chart becomes blacker at the I'ight hand, thus showing that two-months training had greatly increased the output of the employees.. If a chart like this is made with different colored pencils, the facts can be grasped more quickly than when only one color is used.

Fig. 58, at the right-hand end, shows that the workers were earning a bonus practically every day, and it also shows clearlj^ that something was wrong during the middle part of October. The workers failed to earn a bonus at that time for the reason that the bonus work was introduced so rapidly that they did not get adequate instruction. The manager of a plant would realize such a situation at once if he had this kind of a chart before him.