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147
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50
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The Death Valley Expedition: A Biological Survey of Parts of California, Nevada, Arizona, and Utah, Part 2
Collection of reports on Death Valley, the bordering region of California, Nevada, Arizona, and Utah. Reports include birds, reptiles and Batrachians, fishes, insects, mollusks, trees and shrubs, cactuses and yuccas, and list of localities in the reports.
Date:
May 31, 1893
Creator:
Fisher, A. K.; Stejneger, Leonhard; Gilbert, Charles H.; Riley, C. V.; Stearns, R. E. C.; Merriam, C. Hart et al.
Object Type:
Report
System:
The UNT Digital Library
Monographic Revision of the Pocket Gophers: Family Geomyidæ (Exclusive of the species of Thomomys)
From introduction: Study of about 1000 gopher specimens, enabling for the first time actual comparison of various species.
Date:
January 31, 1895
Creator:
Merriam, C. Hart
Object Type:
Report
System:
The UNT Digital Library
[American Shrews]
Brief summary of three genera of American shrews, including characteristics, habits, habitat, and skull, jaws, and teeth illustrations.
Date:
December 31, 1895
Creator:
Merriam, C. Hart & Miller, Gerrit S. (Gerrit Smith), 1869-1956
Object Type:
Report
System:
The UNT Digital Library
Revision of the Skunks of the Genus Chincha
From introduction: "Classification changes to skunks of genus Chincha in order to clear up confusion resulting from previous attempts at classification."
Date:
August 31, 1901
Creator:
Howell, Arthur H.
Object Type:
Report
System:
The UNT Digital Library
A Biological Investigation of the Hudson Bay Region
Results of 1900 biological expedition to document the Hudson Bay. Examination of species of plants and animals.
Date:
October 31, 1902
Creator:
Preble, Edward A.
Object Type:
Report
System:
The UNT Digital Library
The Rabbits of North America
From introduction: "Revision to include all known hares and rabbits of North America from Isthmus of Panama to north Greenland."
Date:
August 31, 1909
Creator:
Nelson, E. W.
Object Type:
Report
System:
The UNT Digital Library
Durability of Stucco and Plaster Construction: Progress Report Containing Results of Investigations up to April, 1916
Technical paper issued by the Bureau of Standards over tests conducted on the durability of stucco construction. Construction methods are discussed. The test results are presented and discussed as well. This paper includes tables, illustrations, and photographs.
Date:
January 31, 1917
Creator:
Wig, R. J.; Pearson, J. C. & Emley, W. E.
Object Type:
Report
System:
The UNT Digital Library
Paint for Priming Plaster Surfaces
Results of commercial and experimental paints tested on plaster, concrete, and other porous surfaces.
Date:
August 31, 1932
Creator:
United States. Bureau of Standards.
Object Type:
Report
System:
The UNT Digital Library
Aircraft Power-Plant Instruments
From Summary: "The report includes a description of the commonly used types and some others, the underlying principle utilized in the design, and some design data. The inherent errors of the instrument, the methods of making laboratory tests, descriptions of the test apparatus, and data in considerable detail in the performance of commonly used instruments are presented. Standard instruments and, in cases where it appears to be of interest, those used as secondary standards are described."
Date:
May 31, 1933
Creator:
Sontag, Harcourt & Brombacher, W. G.
Object Type:
Report
System:
The UNT Digital Library
Wing pressure distribution and rotor-blade motion of an autogiro as determined in flight
From Summary: "This report presents the results of tests in which the pressure distribution over the fixed wing of an autogiro was determined in both steady and accelerated flight. In the steady-flight condition, the rotor-blade motion was also measured. These data show that in steady flight the rotor speed as a function of the air speed is largely affected by the variation of the division of load between the rotor and the wing; as the load on the wing increases, the rotor speed decreases."
Date:
July 31, 1933
Creator:
Wheatley, John B.
Object Type:
Report
System:
The UNT Digital Library
Wind-Tunnel Investigation of an N.A.C.A. 23012 Airfoil with a Slotted Flap and Three Types of Auxiliary Flap
An investigation was made in the N.A.C.A. 7- by 10-foot wind tunnel to determine the aerodynamic section characteristics of an N.A.C.A. 23012 airfoil with a single main slotted flap equipped successively with auxiliary flaps of the plain, split, and slotted types. A test installation was used in which an airfoil of 7-foot span was mounted vertically between the upper and the lower sides of the closed test section so that two-dimensional flow was approximated" (p. 699).
Date:
October 31, 1938
Creator:
Wenzinger, Carl J. & Gauvain, William E.
Object Type:
Report
System:
The UNT Digital Library
Distribution Coefficient of Dâ‚‚O Between Triethylamine and Water
Summary: "Water containing 1.8% D2O was distributed between the two liquid phases formed with triethylamine at 20 and 35 C. The triethylamine was removed from each phase by aseotropic distillation with benzene before analyzing the water by determining its density with a quartz float. The ratios of the concentrations of the D2O in the water layer to that in the amino layer were 1.007 and 1.004 at 20 and 35, respectfully. The differences from unity are about the same as the errors of analysis."
Date:
August 31, 1943
Creator:
Carlson, H. C.
Object Type:
Report
System:
The UNT Digital Library
Report on Trachyte district, Henry Mountains area, Garfield and Wayne Counties, Utah
A report regarding the Trachyte District, located in the Henry Mountains Area, Garfield and Wayne Counties, Utah.
Date:
December 31, 1943
Creator:
Mastrovich, Anthony M.
Object Type:
Report
System:
The UNT Digital Library
Experiments on the Evaporation of Boron in Vacuo : Progress Report No. 1 on a Phase of Problem No. 132 - ML - 56-3; File Serial 13
It was desired to determine a method of evaporating boron to form a rather pure uniform tenacious coat of specified thickness. These coats are needed as monitoring films for neutron intensities, particularly in steel ionization cylinders. The most satisfactory method of evaporating boron employed a graphite filament. A mixture of amorphous boron and Carbenoid A was painted onto the filament which was then heated by electrical resistance method to 2300 degree C at which temperature the boron evaporated. Opaque films with purities up to 98% boron or better could be deposited by this method. Much heat was liberated by the filament, and it was found necessary to cool the steel cylinders during evaporation to prevent alloying of boron with the steel. Cathodic deposition also proved satisfactory for producing high purity films; this method has the advantage that little or no heat is produced during the process, but requires much time. Other less efficacious methods of depositing lighter films of born were developed; these are included in the following discussion.
Date:
March 31, 1944
Creator:
Friel, D. D.
Object Type:
Report
System:
The UNT Digital Library
Resonance Absorption of Uranium in Mixtures
A good determination of the resonance absorption of uranium when admixed with various substances is necessary so that calculations can be made on the efficiency of homogeneous piles. The original experiments along these lines were undertaken by Creutz, Jupnik, and Snyder (C-116) and consisted of experiments on the resonance capture in pure U, UO2, U3O8, and one experiment on capture in a mixture of U3O8 and graphite. These experiments were done at the cyclotron in Princeton and consisted of determining the ratio of the twenty-three minute activity of uranium to an iodine monitor placed in some position with respect to the sample. By using spheres of different radii both the volume and the surface absorptions were measured. It was considered very desirable to extend these measurements to mixtures containing large amounts of graphite to uranium and also to investigate other substances containing hydrogen and deuterium. In addition it was decided to use both iodine and gallium monitors in the experiments. While the experiments were in progress, an absorption curve for uranium metal was made by Marshall using iodine and gallium detectors, which showed that there was a certain amount of overlapping of resonance levels of uranium and iodine.
Date:
March 31, 1944
Creator:
Mitchell, Allan C. G. (Allan Charles Gray), 1902-; Brown, Leon J.; Pruett, John R. & Nering, Evar D.
Object Type:
Report
System:
The UNT Digital Library
Metallurgical Laboratory, Physics Section, Report for the Month Ending May 31, 1945
Technical report with short reports from the (1) Physics Section I; (2) Physics Section II ; and (3) Physics Section III.
Date:
May 31, 1945
Creator:
Snell, A. H.; Nordheim, L. W. & Wollan, Ernest Omar
Object Type:
Report
System:
The UNT Digital Library
A method of analysis of V-G records from transport operations
A method has been developed for interpreting v-g records taken during the course of commercial transport operation. This method involves the utilization of fairly simple statistical procedures to obtain "flight envelopes," which predict that, on the average, in a stated number of flight hours, one value of airspeed will exceed the envelope, and one positive and one negative acceleration increment will exceed the envelope with equal probability of being experienced at any airspeed. Comparison with the actual data obtained from various airplanes and from various airlines indicates that these envelopes predict the occurrences of large values of acceleration and airspeed with a high degree of accuracy.
Date:
August 31, 1945
Creator:
Peiser, A. M. & Wilkerson, M.
Object Type:
Report
System:
The UNT Digital Library
A Method of Analysis of V-G Records from Transport Operations
A method has been developed for interpreting V-G records taken during the course of commercial transport operation. This method involves the utilization of fairly simple statistical procedures to obtain "flight envelopes," which predict that, on the average, in a stated number of flight hours, one value of airspeed will exceed the envelope, and one positive and one negative acceleration increment will exceed the envelope with equal probability of being experienced at any airspeed. Comparison with the actual data obtained from various airplanes and from various airlines indicates that these envelopes predict the occurrences of large values of acceleration and airspeed with a high degree of accuracy.
Date:
August 31, 1945
Creator:
Peiser, A. M. & Wilkerson, M.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Jet-Propulsion-Engine Combustion-Chamber Pressure Losses
From Summary: "The development and the use of a chart for estimating the pressure losses in jet-engine combustion chambers are described. By means of the chart, the pressure losses due to fluid friction and to momentum changes in the air flow accompanying combustion can be separately evaluated. The over-all pressure losses computed from the pressure-loss chart are within 7 percent of the experimental values for the three types of combustion chambers considered herein."
Date:
July 31, 1946
Creator:
Pinkel, I. Irving & Shames, Harold
Object Type:
Report
System:
The UNT Digital Library
Experimental investigation of the effects of viscosity on the drag and base pressure of bodies of revolution at a Mach number 1.5
Models were tested to evaluate effects of Reynolds number for both laminar and turbulent boundary layers. Principal geometric variables investigated were afterbody shape and length-diameter ratio. Force tests and base-pressure measurements were made. Schlieren photographs were used to analyze the effects of viscosity on flow separation and shock-wave configuration and to verify the condition of the boundary layer as deduced from the force tests. The results are discussed and compared with theoretical calculations.
Date:
January 31, 1947
Creator:
Chapman, Dean R. & Perkins, Edward W.
Object Type:
Report
System:
The UNT Digital Library
Flight Investigation of the Effects of Ice on an I-16 Jet-Propulsion Engine
"A flight investigation of an I-16 jet propulsion engine installed in the waist compartment of a B-24M airplane was made to determine the effect of induction-system icing on the performance of the engine. Flights were made at inlet-air temperatures of 15 deg, 20 deg., and 25 F, an indicated airspeed of 180 miles per hour, jet-engine speeds of 13,000 and 15,000 rpm, liquid-water contents of approximately 0.3 to 0.5 gram per cubic meter, and an average water droplet size of approximately 50 microns. Under the most severe icing conditions obtained, ice formed on the screen over the front inlet to the compressor and obstructed about 70 percent of the front-inlet area" (p. 1).
Date:
January 31, 1947
Creator:
Pragliola, Philip C. & Werner, Milton
Object Type:
Report
System:
The UNT Digital Library
Progress Report for the Month of January, 1947 : Contract No. W-38-094-Eng-27
This report for January, 1947 discusses progress regarding ore dressing studies, pyrometallurgical work, chemical work, chemical and spectrographic analysis, and physical methods of analysis.
Date:
January 31, 1947
Creator:
Center, E. J.; Nelson, H. R.; Pray, H. A. & Richardson, A. C.
Object Type:
Report
System:
The UNT Digital Library
Progress Report for the Month of March, 1947 : Contract No. W-38-094-eng-27
This report for March, 1947 describes progress regarding chemical and spectrographic analysis, chemical work, physical methods of analysis, and ore dressing and pyrometallurgical studies,
Date:
March 31, 1947
Creator:
Center, E. J.; Nelson, H. R.; Pray, H. A.; Richardson, A. C. & Sullivan, J. D.
Object Type:
Report
System:
The UNT Digital Library
Progress Report for the Month of May, 1947 : Contract No. W-38-094-eng-27
This report for May, 1947 describes progress regarding analytical work, chemical work, beta-counting methods of analysis, ore-dressing and pyrometallurgical studies, and pyrometallurgical work.
Date:
May 31, 1947
Creator:
Center, E. J.; Nelson, H. R.; Pray, H. A. & Richardson, A. C.
Object Type:
Report
System:
The UNT Digital Library