the Editor of the "Noara-Catwa Day New T would again trespass on your th your permission, not so much vith the idea of continuing the discussion, wut with the wish, not onl} letter of "Landlubber" in your columns of the 17th inst., but to point out that the elucidation of the question under diseussi lies with those who are commanding vessels carrying the kerosene oil. The theory set up by the captain and second officer of the Chingping as to the electro-magnetic effect of the fumes of keroxone oil on the iron of the ship, unless disproved, admits an element of doubt that would cause many shipmasters much anxiety and raise endless arguments in "Naval Enqui "'Landlubber" in his suggestion of compiling two tables of deviation, is quite right, but. when compiled the two tables should undergo, that operation in mechani known as the Resolution of Forces, i.e, they should he separated into their component parts in that form known to us as ce-efficients.
Semi-circular deviation being represented by Bt and C+ Quadrantal deviation being represented and Et.
When the. carefully observed errors are thus resolved, it becomes possible to trace the cause to its source, whether transient induced magnetism in vertical soft iron or transient induced magnetism in horizontal soft iron. A comparison then of the two tables of ce-efficients would not only be instructive to shipmasters generally but would prove of considerable interest to home authorities, and I would certainly recommend Mr. Chard and others interested, when in the position to do so, to compile such rubles of ce-efficients and. publish the results.
Tt is a pity in my opinion that a regular Debating Society for such questions does not exist in Shanghai, for with the increase in recent years in the maritime population,
Text read from the printed page and cleaned; old type leaves the occasional error.