The Bureau of Equipment has prepared a publication giving the results of many steaming trials of different varieties of coal, domestic and foreign, made by naval vessels. Among them appear the results obtained by the Montgomery during the past winter, while she was engaged in testing Southern coals from the fields in northern Alabama and southeastern Tennessee. As these tests were all made by one ship under circumstances as closely alike as possible, and the coals all came from the same general locality, it may be of interest to publish these results in the Proceedings in a separate and more detailed form. They will be found below, largely in tabular form; but the remarks supplementary to the tabulated data are quite as important as those data themselves in forming a correct estimate of the steaming value of the different coals for naval purposes.
For each test the operators furnished, free of charge, 75 tons of the particular variety; in addition, enough more of the same sort was purchased to provide for raising steam and getting in and out of port, for working auxiliaries, and for possible contingencies, thus ensuring the full 75 tons for the test proper.