UNT Libraries Government Documents Department - 3,615 Matching Results

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open access

Cost Keeping for Small Metal Mines

Description: Technical paper issued by the Bureau of Mines over the accounting for small metal mines. As stated in the introduction, "this report outlines methods of cost keeping suitable for metal mines of small or moderate size and presents various forms and cost sheets that have been found useful in actual practice" (p. 5). This paper includes tables, and illustrations.
Date: February 1919
Creator: Pickering, J. C.
Item Type: Refine your search to only Report
open access

A New Interferential Dilatometer

Description: Scientific paper issued by the Bureau of Mines over development of a dilatometer. The instrument is used in tests of thermal expansion. The methods are presented and discussed. This paper includes an illustration.
Date: February 28, 1920
Creator: Priest, Irwin G.
Item Type: Refine your search to only Report
open access

Effect of the Reversal of Air Flow Upon the Discharge Coefficient of Durley Orifices

Description: Note presenting an experiment to obtain information regarding the relationship between the coefficients for flow in the two directions through an inlet. The results indicate that the ratio of the orifice discharge coefficient from standard orifice to the discharge coefficient from reverse flow is always less than unity, but approaches unity with increasing ratio of box area to orifice area, and that even for a ratio of areas as low as twenty the ratios of the coefficients is not much less than … more
Date: February 1921
Creator: Ware, Marsden
Item Type: Refine your search to only Report
open access

Preparation and Uses of Tar and its Simple Crude Derivatives

Description: Technical paper issued by the Bureau of Mines over studies of coal tars. As stated in the introduction, "this paper discusses the uses to which some of the various tars are put and shows briefly the usual methods of working up tar into some of its simple or easily prepared derivatives, for which a market can generally be found" (p. 5). This paper includes tables, illustrations, and photographs.
Date: February 1922
Creator: Odell, W. W.
Item Type: Refine your search to only Report
open access

Methods and Costs of Stripping and Mining at the United Verde Open-Pit Mine, Jerome, Arizona

Description: Report issued by the U.S. Bureau of Mines discussing the mining practices and expenses of the United Verde open-pit mine west of Jerome, Arizona. As stated in the introduction, "the purpose of this paper is to present the methods used in developing and operating the mine, and to discuss the problems encountered" (p. 1). This report includes tables, maps, and illustrations.
Date: February 1930
Creator: Alenius, E. M. J.
Item Type: Refine your search to only Report
open access

Mineral Industries Survey of the United States: Idaho, Shoshone County, Coeur d'Alene District: the Silver Belt and the Sunshine Mine of the Coeur dÁlene District

Description: Report issued by the U.S. Bureau of Mines discussing the mineral production of mines in Shoshone County, Idaho. Mining and milling methods of these mines are presented. This report includes tables, maps, illustrations, and a photograph.
Date: February 1936
Creator: Julihn, C. E. & Horton, F. W.
Item Type: Refine your search to only Report
open access

Stemming in Metal Mines. Progress Report 3: Relative Advantages and Disadvantages of Different Types of Stemming and No Stemming When Used with 60 Percent Ammonia Gelatin Dynamite at the Mount Weather Testing Adit

Description: Report issued by the U.S. Bureau of Mines on the progress made in metal-mine stemming. Previous reports have been presented impartially, or under different procedures. This report contains updated progress results from current procedures and mine conditions. The report includes tables, and illustrations.
Date: February 1942
Creator: Johnson, John A.; Agnew, Wing G. & Mosier, McHenry
Item Type: Refine your search to only Report

Newsmap. Monday, February 1, 1943 : week of January 22 to January 29

Description: Front: Text describes action on various war fronts: Allied Council, North Africa, Western Europe, Solomons, New Guinea, Wake, Russia, Aleutians. Includes ten photographs. Large world map is keyed to text and illustrates time zones around the world. Inset maps show North Africa and Russia. Back: "Soviet Infantry." Two posters by Glen Mitchell show Soviet infantry in action. Also included are images of Soviet uniform insignia and Soviet weapons.
Date: February 1, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

Effective Temperature of Neutrons in a Lattice

Description: The average energies of neutrons emitted from a graphite column at 22 degrees C were compared by measurement of the cross section of boron for neutrons which are stopped by cadmium. At a distance from the neutron source great enough to insure that the neutrons were in thermal equilibrium the average energies of the emerging neutrons were found to be proportional to the temperature within the limits of the experimental error. A measurement made with boron absorbers which had been thus standardiz… more
Date: February 10, 1943
Creator: Woods, L.
Item Type: Refine your search to only Report
open access

Temperature Coefficient of the Reproduction Factor for Different Lattice Arrangements

Description: The temperature coefficient is calculated for various lattice arrangements, taking into account the variation of [formula], suggested by Fermi. Four contributions are included: leakage, levelling of the dip in thermal neutron density in the lump, resonance absorption, and hardening of the neutrons as they penetrate a metal lump. The departure of neutron temperature from lattice temperature decreases the total coefficient. Values are given for 3 typical piles; in general, the larger the uranium … more
Date: February 10, 1943
Creator: Morrison, P.
Item Type: Refine your search to only Report

Newsmap. Monday, February 22, 1943 : week of February 12 to February 19, 180th week of the war, 62nd week of U.S. participation

Description: Front: Text describes action on various war fronts: Russia, New Guinea, Solomons, China, Pacific and Far East, French fleet, North Africa. Large world map is keyed to text. Includes table: Great Circle Distances in Statute Miles. Inset maps show Tunisia and Russia. Includes 8 photographs. Back: Poster provides recognition cues and front and profile drawings of Allied and Axis light tanks and self-propelled weapons. Includes range scale.
Date: February 22, 1943
Creator: [United States.] Army Orientation Course.
Item Type: Refine your search to only Poster
open access

Low-Density UO2 Pile

Description: The multiplication factor and minimum pile size for a multiplying pile using UO2 powder of density 1 have been computed. It appears that a k of 1.0177 is possible for a volume ration of V/V001=3.33.
Date: February 24, 1943
Creator: Ibser, H. W.
Item Type: Refine your search to only Report
open access

Uranium Hydride, a Review to January 1, 1944

Description: Abstract. A review of all work on uranium hydride published in the CC, CT, CN and CE reports to January 1, 1944, is presented. Some additional information not yet published has been included, so this report includes all data known from the above sources and at Ames to the above date. This report supersedes all previous report on uranium hydride coming out of the Ames laboratory.
Date: February 10, 1944
Creator: Newton, A. S.; Warf, J. C.; Johnson, O. & Nottorf, R.
Item Type: Refine your search to only Report
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