In the anthracite fields of Pennsylvania, mine fires occur with more or less regularity and their existence is an ever-present hazard in coal mining. In
In preparing a sample of refined lead for analysis, it is necessary to exercise great care to avoid contamination, as the amounts of the various
Every one connected with a mine knows that it is hard to keep down the costs of moving ore from the place where it is
A study on the effect of time in tempering medium-carbon steel, when the following conclusions were reached: It is not fair to consider the question
In the manufacture of gun forgings and other steel parts that, in service, are subject to sudden high stresses and shocks, it is most desirable
This excellent volumetric method commends itself as a means of estimating the fineness of silver—firstly, owing to the large number of possible impurities which do
