1. That of the oils used, viz., olive sperm, neat's-foot, and paraffine, the samples of paraffine oil on copper was least affected, and that sperm was next in order of inaction.
2. That the appearances of the paraffine oil and the copper were not changed after an exposure of 77 days.
He later[20] experimented further with the following results noted, after one day's exposure, with iron:--
1. _Neat's-foot._--Considerable brown irregular deposit on metal. The oil slightly more brown than when first applied.
2. _Sperm._--Slight brown deposit with irregular markings on the metal. Oil of dark brown color.
3. _Olive._--Clear and bleached by exposure to light and air. The appearance of metal the same as when first immersed.
4. _Paraffine._--Oil bright yellow and contains a little brown deposit.
The action of oils on iron exposed to their action for twenty-four hours and on copper after ten day's exposure was found to have been:--
------------+----------------+----------------- OILS. | IRON DISSOLVED | COPPER DISSOLVED | IN 24 HOURS. | IN 10 DAYS. ------------+----------------+----------------- Neat's foot | .0875 grain. | .1100 grain. Sperm | .0460 " | .0030 " Olive | .0062 " | .2200 " Paraffine | .0045 " | .0015 " ------------+----------------+-----------------
~76. Various Experiments~ have been made by the writer with a number of oils that may be, or have been, used in horology, as well as with the principal watch oils on the market. At first he did not intend to mention the names of the manufacturers; but, after seeking advice of several eminent watchmakers, and on mature consideration, he decided to do so for the following reasons:--
1. The object of the Society before which these lectures were delivered[21] is "to promote and to secure concerted action for the purpose of _mutual_ improvement in the practice of our profession as horologists, by a study of both the practical and theoretical divisions of the science and art of horology; _to publish the results of such study for the benefit of all in the profession_; _to preserve the same for the use of our successors_; to elevate the standard of workmanship; and to encourage in the members a higher conception of what our art really is."