(a) an "eye worker";
(b) able to concentrate attention for unusually long periods;
(c) able to get every thought out of a simple written sentence;
(d) keenly interested in his work;
(e) accurate;
(f) possessed of infinite patience;
(g) an enthusiastic photographer.
The measurer or observer should, preferably, have the intimate knowledge that comes from personal experience of the work to be observed, although such a man is often difficult if not impossible to obtain.
The position of observer illustrates another of the many opportunities of the workmen for promotion from the ranks to higher positions when they are capable of holding the promotion. Naturally, other things being equal, no man is so well acquainted with the work to be observed as he who has actually done it himself, and if he have also the qualifications of the worker at the work, which should, in the future, surely be determined by study of him and by vocational guidance, he will be able to go at once from his position in the ranks to that of observer, or time study man.