Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Earth Sciences

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 58951 - 58980 of 59547

Full-Text Articles in Entire DC Network

Induction Furnace Smelting Of Montana Chromite, Millard L. Reyner May 1942

Induction Furnace Smelting Of Montana Chromite, Millard L. Reyner

Bachelors Theses and Reports, 1928 - 1970

In 1939 the total world production of crude chromite was approximately 1,167,000 metric tons; of which the United States produced only 3,672 metric tons and imported over 317,500 metric tons. Imports came mostly from the Philippine Islands, Cuba, South Africa, and Rhodesia.

Go to article

Testing And Concentration Of A Low Grade Gold Ore From Marysville, Montana, John B. White, Jr. May 1942

Testing And Concentration Of A Low Grade Gold Ore From Marysville, Montana, John B. White, Jr.

Bachelors Theses and Reports, 1928 - 1970

The purpose of this thesis was to investigate and attempt to concentrate low grade cyanided tailings rejected from the old Montana Mining and milling Company's mill situated 4 miles below the town of Marysville, Montana.

Go to article

A Study Of The Dissolution Of Pyrolusite In Sulphuric Acid, John J. Worsdell May 1942

A Study Of The Dissolution Of Pyrolusite In Sulphuric Acid, John J. Worsdell

Bachelors Theses and Reports, 1928 - 1970

With an eye to the future development of its re­sources, the large deposits of low-grade manganese ore within Montana's boundaries show great promise of developing an important industry. With the pre­sent war demands and the possibility of a future mar­ket it is essential that work expended to utilize this important mineral.

Go to article

Age Hardening Of Copper-Aluminum Alloy Castings, Frank Randall May 1942

Age Hardening Of Copper-Aluminum Alloy Castings, Frank Randall

Bachelors Theses and Reports, 1928 - 1970

Age hardening occurs in alloys of the solid solution type containing a hardening constituent, be it metal or metallic compound, which is more soluble in the solvent phase at higher temperatures than at lower ones.

Go to article

An Investigation Into The Recovery Of Indium From Fume Residue, Emery J. Turner May 1942

An Investigation Into The Recovery Of Indium From Fume Residue, Emery J. Turner

Bachelors Theses and Reports, 1928 - 1970

Several months were required to produce a single gram of indium. Consequently, the industrial history of the metal is extremely short. In view of the unique properties that indium has demonstrated in this short period, it is probable that indium is still in its early stage of development. However, the commer­cial applications of the metal are well established and indium is now produced on a commercial scale. It is obtainable as the metal or in solution for electroplat­ing.

Go to article

Some Leaching Characteristics Of The Butte Rhodochrosite, W. L. Slosson May 1942

Some Leaching Characteristics Of The Butte Rhodochrosite, W. L. Slosson

Bachelors Theses and Reports, 1928 - 1970

With the increasing importance of manganese in the metallurgical fields of today and tomorrow, ex­tensive work along the lines of its successful ex­ploitation has been accomplished by many investiga­tors. Since tie current world situation has shut off most of our supply of high-grade manganese ores from foreign sources, the low-grade domestic deposits have entered the fields of investigation very rapidly.

Go to article

The Effects Of Some Percentages Of Nickel On The Annealing Of Cartridge Brass, A. Edward Zezula May 1942

The Effects Of Some Percentages Of Nickel On The Annealing Of Cartridge Brass, A. Edward Zezula

Bachelors Theses and Reports, 1928 - 1970

The most important element in the alloying of steels, has also been used quite extensively as a third constituent in copper-zinc alloys. The chief characteristics of nickel which make it desirable as an alloying element are its toughness, high strength, and resistance to corrosion.

Go to article

The Anodic Oxidation Of Vanadium In Phosphoric Acid Solution, Ben H. Alexander May 1942

The Anodic Oxidation Of Vanadium In Phosphoric Acid Solution, Ben H. Alexander

Bachelors Theses and Reports, 1928 - 1970

The purpose of this thesis was to analyze the possibility of recovering the vanadium in the phosphoric acid by anodic oxidation in an electrolytic cell. This problem allowed not only the possibility of improving a commercial operation, but a study of the functioning of an interesting and very important phenomena.

Go to article

Mineral Occurences In Certain Pegmatite Dikes In Southwestern Montana, Jacob N. Jovick May 1942

Mineral Occurences In Certain Pegmatite Dikes In Southwestern Montana, Jacob N. Jovick

Bachelors Theses and Reports, 1928 - 1970

Pegmatite dikes are rather common in occurrence in parts of southwestern Montana, particularly in a region to the east of the Tobacco Root range 50 to 75 miles southeast of Butte.

Go to article

The Velocity Of Falling Particles In A Liquid Medium, Elliott Coldwater May 1942

The Velocity Of Falling Particles In A Liquid Medium, Elliott Coldwater

Bachelors Theses and Reports, 1928 - 1970

The investigation was prompted by the fact that there seemed to be some discrepancy between the results published by Richards,and the empirical figures used in classification and in gravity concentration. Further, the work of Richards was restricted to quartz and galena whereas this study also includes pyrite and calcite.

Go to article

The Recovery Of Zinc From Butte Mine Waters, Edmond M. Fern May 1942

The Recovery Of Zinc From Butte Mine Waters, Edmond M. Fern

Bachelors Theses and Reports, 1928 - 1970

Very little work has been done towards the recovery of zinc from mine water because the zinc content of the water is generally low. As different from copper, which can very easily be replaced by iron in any of its solutions, zinc is very high up in the electro-chemical series and so the few metals above zinc, most of which are rare and hence expensive, cannot be used to replace zinc from its solution.

Go to article

Polishing Mineral Specimens By The Use Of An Optical Polishing Machine, Wilbur J. Guay May 1942

Polishing Mineral Specimens By The Use Of An Optical Polishing Machine, Wilbur J. Guay

Bachelors Theses and Reports, 1928 - 1970

The problem in this investigation was to determine if mineral specimens mounted in bakelite, or lucite, could be polished for microscopic examination by the use of an optical polishing machine, and if this method would cut down the length of time required to polish specimens by the methods now in use.

Go to article

Electrical Resistivity Measurements Of Powder Metal Compacts, John M. Fitzpatrick May 1942

Electrical Resistivity Measurements Of Powder Metal Compacts, John M. Fitzpatrick

Bachelors Theses and Reports, 1928 - 1970

This work, as it was originally planned, was the arranging of an apparatus whereby electrical resistivity measurements could be made on powder compacts. It was also to include measurements on a series of copper-nickel compacts both before and after sintering.

Go to article

Mineralogy And Genesis Of The Vermiculite Deposits At Libby, Montana, Raymond Kujawa May 1942

Mineralogy And Genesis Of The Vermiculite Deposits At Libby, Montana, Raymond Kujawa

Bachelors Theses and Reports, 1928 - 1970

The problem considered in this report is one of the mineralogy and mode of formation of the extremely pure, large bodies of vermiculite. Mineralogically the ultrabasic intrusive, with which the economic mineral is associated, presents an array of rather unusual minerals. The determination of these minerals, their associations, and the sequence of alteration that lead to the formation of the vermiculite bodies, constitutes the problem.

Go to article

Geology Of Iron Deposits At Princeton Montana And Economic Aspects Of Iron Ore In Montana, Carl Lind May 1942

Geology Of Iron Deposits At Princeton Montana And Economic Aspects Of Iron Ore In Montana, Carl Lind

Bachelors Theses and Reports, 1928 - 1970

The purpose of this paper is to introduce to the reader, an iron deposit in the Princeton district, about 19 miles northeast by highway from Philipsburg, Montana. Heretofore there has been no written literature on this deposit. It is also intended to investigate the economic possibilities of iron ore in general in the State of Montana.

Go to article

Insoluble Residues Of The Lower Mississippian Limestones Of The Madison Group, Fred G. Lines May 1942

Insoluble Residues Of The Lower Mississippian Limestones Of The Madison Group, Fred G. Lines

Bachelors Theses and Reports, 1928 - 1970

The correlation of non-fossiliferous drill samples is one of the difficult problems that is en­countered in sub-surface stratigraphy. In order to truly correlate a formation, it must have some dis tinctive features and have an areal persistence of these features. These requirements are probably met best by limestone.

Go to article

Sizing By Elutriation Of Finely Ground Quartz And Pyrite, Elmer C. Polson May 1942

Sizing By Elutriation Of Finely Ground Quartz And Pyrite, Elmer C. Polson

Bachelors Theses and Reports, 1928 - 1970

Elutriation, as a means of sorting mineral particles, has received marked attention during the last fifteen years. Its use in the ceramics industry for the sorting of clays was recognized even before this.

Go to article

Parabos Dodsoni Barbour And Schultz: A Correction, Erwin Hinckley Barbour, C. Bertrand Schultz May 1942

Parabos Dodsoni Barbour And Schultz: A Correction, Erwin Hinckley Barbour, C. Bertrand Schultz

Department of Earth and Atmospheric Sciences: Faculty Publications

A Bos-like animal, Parabos dodsoni, was recently described by Barbour and Schultz (1941, "A New Fossil Bovid from Nebraska", Bull. Univ. Nebr. State Museum, Vol. II, No. 7, pp. 63-66, Figs. 24-27, December) as a new genus and species from the Pleistocene of Nebraska. Attention has been called to the writers by Dr. E. H. Colbert of the American Museum of Natural History that the name Parabos is preoccupied. Parabos was introduced as a generic name by C. Arambourg and J. Piveteau (1929, "Note preliminaire sur un Ruminant du Pliocene inferieur du Roussillon," C. R. Bull. Soc. Geol. de …

Go to article

Phosphate Deposits In Western Summit, Wasatch, Salt Lake, Morgan, And Weber Counties, Utah, Alvin M. Hanson May 1942

Phosphate Deposits In Western Summit, Wasatch, Salt Lake, Morgan, And Weber Counties, Utah, Alvin M. Hanson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Phosphate deposits in the western United States have been the subject of considerable discussion in the last decade, and during the last few years much interest has been aroused in them. Phosphate was first discovered in this area in 1889, but it was not until 1906 that the United States Government took active interest in the study of these deposits. The investigation by the government of the occurrence of western phosphate was begun by Weeks and Ferrier (10), and later carried on by others. On December 9, 1908 the western phosphate reserve was created and many acres of land were …

Go to article

Chromite Deposits Near Red Lodge And Silver Star, Montana, Edmond F. Smigel Apr 1942

Chromite Deposits Near Red Lodge And Silver Star, Montana, Edmond F. Smigel

Bachelors Theses and Reports, 1928 - 1970

The Red Lodge and Silver Star chromite deposits of Montana have stimulated much interest during periods of war. The Red Lodge deposit is 25 miles southwest of Red Lodge which is also the nearest railroad point. Several workings are scattered throughout the area, exposing lense-like ore bodies averaging 33% chrome oxide. Silver Star is a much smaller deposit 5 miles west of Silver Star, Montana, which is its nearest rail­road point. Lenses of chromite are exposed by pits and trench­es, which average approximately 36% chromic oxide.

Go to article

The Beneficiation Of Montana Silver Star Chromite Ore, Edwin J. Bride Apr 1942

The Beneficiation Of Montana Silver Star Chromite Ore, Edwin J. Bride

Bachelors Theses and Reports, 1928 - 1970

It is known that there are large deposits of chromium ore in Stillwater and Carbon Counties in South-Central Montana. The late James F. Kemp of Columbia University, stated in 1928, that these were the largest chromium deposits in the United States and probably in the world, although they were not considered of commercial grade as compared with foreign ores.

Go to article

An Investigation Of The Ores Of The Big Seven Mine, Neihart, Montana, Francis L. Wilson Apr 1942

An Investigation Of The Ores Of The Big Seven Mine, Neihart, Montana, Francis L. Wilson

Bachelors Theses and Reports, 1928 - 1970

During the course of this investigation of the ores of the Big Seven mine, Neihart, Montana, the writer has attempted, through a mi­croscopic study of polished sections, to ascertain the hypogene or supergene character of the ore minerals present in the ore suite.

Go to article

The Present Status Of The Soil Survey In Minnesota, P. R. Mcmiller Apr 1942

The Present Status Of The Soil Survey In Minnesota, P. R. Mcmiller

Journal of the Minnesota Academy of Science

No abstract provided.

Go to article

A Review Of The Daimonelix Problem, C. Bertrand Schultz Mar 1942

A Review Of The Daimonelix Problem, C. Bertrand Schultz

University Studies (University of Nebraska) (1888–1984)

THE first paleontological expedition of the University of Nebraska State Museum was organized in the summer of 1891 and was led by Erwin H. Barbour, now Director Emeritus of the Museum. The most important and interesting discoveries made during the season were some very peculiar spiral fossils called by the field party "Devil's Corkscrews," or Daimonelix,l which were found in the Miocene deposits near Harrison in Sioux County, Nebraska. During the fifty years that have intervened scientists have tried to determine the origin of these strange forms. Several controversies arose, and although various theories have been proposed, none as yet …

Go to article

Geologic Field Mapping In An Area Eight Miles North Of Three Forks, Montana, H. E. Lillis Jan 1942

Geologic Field Mapping In An Area Eight Miles North Of Three Forks, Montana, H. E. Lillis

Bachelors Theses and Reports, 1928 - 1970

The Three Forks are includes parts of Jefferson, Madison, Broadwater Pond Gallatin counties, Montana. Sedimentary formations lie at the surface nearly everywhere in the area, and the rugged surface topography has been developed through the folding and tilting of these formations and their dif­ferential erosion.

Go to article

The Geology Of The Claiborne (Eocene) Group Of Mississippi As Far North As Grenada County., Emil Paul Thomas Jan 1942

The Geology Of The Claiborne (Eocene) Group Of Mississippi As Far North As Grenada County., Emil Paul Thomas

LSU Historical Dissertations and Theses

No abstract provided.

Go to article

Geology Of Desoto And Red River Parishes, Louisiana., Grover E. Murray Jan 1942

Geology Of Desoto And Red River Parishes, Louisiana., Grover E. Murray

LSU Historical Dissertations and Theses

No abstract provided.

Go to article

Thickness And Structural Study Of Major Divisions Of Cretaceous System In Nebraska, Paul Fuenning Jan 1942

Thickness And Structural Study Of Major Divisions Of Cretaceous System In Nebraska, Paul Fuenning

Department of Earth and Atmospheric Sciences: Faculty Publications

The purpose of this paper is to present isopach maps of certain stratigraphic divisions of the Cretaceous system and structure-contour maps of certain horizons of that system in Nebraska. Tables of factual data also are included. The maps indicate clearly that certain structural "highs" such as the Chadron-Cambridge axis and the Sioux Falls "high," in conjunction with a large well defined basin across central Nebraska and another deep basin west of the Chadron-Cambridge axis, dominated the structural and depositional history of Nebraska during the Cretaceous period.

Go to article

The Origin Of Daemonelix, Alvin Leonard Lugn Oct 1941

The Origin Of Daemonelix, Alvin Leonard Lugn

Department of Earth and Atmospheric Sciences: Faculty Publications

Attention is called to the controversy of some years ago over the origin of the "Devil's Corkscrews." The problem may have appeared unimportant then, but now a correct understanding of the paleoecology of Harrison time may hinge on the explanation of these strange "fossils." The characteristics of Daemonelix are briefly reviewed, they are compared to the lianas of the modern tropical jungle, and the postulated conditions of Harrison sedimentation are believed to supply an adequate explanation for the presence of fossil rodent remains in the Daemonelices. The possibility of a vegetal origin of these fossils is believed to be demonstrated.

Go to article

The Magnesium Content Of The Rocks Of The Upper Cretaceous System Of Ellis And Osborne Counties, Kansas, Robert Funston Jul 1941

The Magnesium Content Of The Rocks Of The Upper Cretaceous System Of Ellis And Osborne Counties, Kansas, Robert Funston

Master's Theses or Doctor of Nursing Practice

The recent impetus given industry by the national defense emergency has made everyone more or less conscious of the great importance of minerals. During the past few years some of the industrial leaders of Kansas have been attempting to promote the natural resources of the state. Some minerals once considered of little or no value are now being developed. For many years the limestone rocks of Western Kansas have been used for building purposes. Until recently little work has been done on the chemical composition of these rocks. The author has decided to continue the study by analyzing the rocks …

Go to article

First Prev Next Last