Antimony and Tellurium Alloys
The study of an entirely new series of alloys may be undertaken from a desire to obtain knowledge applicable to the perfection of industrial alloys, or merely to test certain theoretical considerations. In the case of antimony & tellurium alloys, the theoretical side only is at present important; but it is hoped that the results […]
Prospector Survival Equipment List
The engineer has often to penetrate difficult or unknown regions. Mineral, irrigation, boundary and railway problems frequently necessitate journeys through, or long residence in, localities whence sustenance cannot be drawn. The selection and conveyance of provisions, outfit and implements thus become a matter of the first importance. Scientific skill, even of the highest order, is […]
Underground Mine Dam Construction
The limit of pressure to which an underground dam may with safety be subjected, is a question that—as far as the writer knows—has not received the same attention from authorities on engineering construction, or practical mining, that has been accorded to questions on which the design and strength of other structures or machines in connection […]
Methods of Timbering and Working Wide Lodes
It has been more especially in these large low grade ore bodies, that modern methods have been beneficial; for small lodes must be rich to pay at all, as they cannot be worked on the same gigantic scale, but even in these a percentage of metal is saved which formerly was absolutely lost. To make […]
Method for Calculating Volume of Small Mine Drifts
In the Engineering and Mining Journal there appeared an article by Fred T. Greene, describing a method of measuring stopes by the use of strings, a clinometer and a tape. I had occasion to use a somewhat similar method, for the purpose of accurately ascertaining the volume of a very irregular drift connecting two mines. This […]
How to Collect & Weigh a Sample
I have chosen this subject in view of the fact that, while there are many and ample opportunities of getting reliable assays made, there are but few who are in a position to obtain reliable data on the sampling of minerals and metals; my long experience, where, for five years, I had charge of the Refining […]
Water Wheel Design & Construction
Opinions differ as to whether the water-wheel almost universally known as the Pelton type belongs to the impulse, the tangential, the reactive, the jet or the percussion class, or to a cross between two or more of these classes. The fact is, that for an almost infinitesimal part of a second the axis of the […]
Mougin Rotating Turrets
In presenting the subject of “ Armored Turrets for Coast Defense ” to this Institute, I am indebted to the Gruson Iron-works, a company incorporated under the laws of the State of New York, for valuable information, model and plans, by which I hope to make clear the construction and peculiar merits of this class […]
Relation Between the Strength of Cyanide Solutions and Their Dissolving Power
It has already been shown by Maclaurin, that the dissolving power of a cyanide solution saturated with oxygen increases with its strength until a strength of 5 or 10 per cent, is reached, and diminishes again as the strength in cyanide increases beyond that point. But, so far as I am aware, no one has […]
Hydrogen Peroxide & Gold Cyanidation
The peroxide of hydrogen used was Marchand’s medicinal, containing 3.3 per cent, of available peroxide, as determined by titration with permanganate of potassium. According to the new theory, the H2O2, (±) takes up from the gold strip o, which becomes positive, two units of negative electricity and dissociates into 2 (OH) (—). In the first […]