---------------------+-------------+---------------+---------+---------------- [Note A: Obtained as sample from manufacturer.] [Note B: Purchased in open market.] [Note C: Not sold as watch oil.] 4. On hearing of these experiments, others in the profession may be tempted to make similar or other investigations and publish them. 5. In that case, if the results of many experiments demonstrate the superiority of one particular kind of oil, the whole profession will be profited thereby. 6. The manufacturers of oils may be caused to exert their utmost to keep abreast of the times, and will see for themselves in what way their oils may not fulfill the required conditions, thereby being the better prepared to overcome the difficulties with which they meet. For the sake of convenience the author has tabulated a list of the oils which he has subjected to various tests, showing the name, kind and source of each oil tested; also those which were obtained as samples, and those which were purchased in open market, as well as those which were not sold as watch oils, but which may be tried. This is shown in table III. ~77. The Action Of Oils On Brass~ has been determined by the author by using a piece of good sheet brass into which suitable recesses were made for the retention of the various oils. This plate was submitted to the action of the air at temperatures varying from 24° to 37.5° C. (about 76° to 100° F.), for 100 days. The results of this test are shown in Table IV. A further test, under different conditions, gave results as shown in Table V. TABLE IV. ACTION OF OILS ON BRASS. Temp. 21° to 37.5° C. = 70° to 100° F. Time 100 days. ----------------+------------------------------------- SYMBOLS | CONDITION. ACCORDING TO +--------------+---------------------- TABLE III. | OF OIL. | OF BRASS. ----------------+--------------+---------------------- E. K. | Light brown. | Brown. W. F. N. | " | " W. C. | " | Light brown. B. & K. | " | " C. L. Co. w. | Spread. | " C. L. Co. No. 1 | Unaltered. | " Glyc. | " | " Sp. | Light brown. | Greenish-brown. Ol. | Green. | Dark greenish-brown. ----------------+--------------+---------------------- TABLE V. ACTION OF OILS ON BRASS. Temp. 5.5° to 21° C. = 40° to 70° F. Time 25 days.