Baltimore Paper - The Magnetic Iron-Ores of Ashe County. N.C.

In view of the extensive use of vanning-machines in this country, a brief comparison of the results obtained by the plain belt generally employed, and the corrugated belt which was introduced a few years ago, may be of interest. The data given below have been abstracted from a working-journal, and hence lack the precision, and also, in several desirable particulars, the detail, which would naturally have been secured in special experiments ; but they have the advantage of being working-figures, and are sufficient as the basis of a fair comparison between the two kinds of belt working on similar ores. The conditions under which the work was done were the following :