A Biological Reconnaissance of the Base of the Alaska Peninsula (open access)

A Biological Reconnaissance of the Base of the Alaska Peninsula

General account with outline of route and life zones, and lists of mammals and birds.
Date: November 23, 1904
Creator: Osgood, Wilfred H.
Object Type: Report
System: The UNT Digital Library
Revision of the Skunks of the Genus Spilogale (open access)

Revision of the Skunks of the Genus Spilogale

From introduction: "Revision of skunk genus Spilogale based upon a study of about 380 skins with skulls and 75 additional skulls from the collection of the Biological Survey."
Date: November 24, 1906
Creator: Howell, Arthur H.
Object Type: Report
System: The UNT Digital Library
Economic Methods of Utilizing Western Lignites (open access)

Economic Methods of Utilizing Western Lignites

Report issued by the Bureau of Mines over western lignite. The economic use of these lignite deposits is discussed. This report includes tables, illustrations, and photographs.
Date: November 1915
Creator: Babcock, E. J.
Object Type: Report
System: The UNT Digital Library
Extraction and Recovery of Radium, Uranium and Vanadium from Carnotite (open access)

Extraction and Recovery of Radium, Uranium and Vanadium from Carnotite

Report issued by the Bureau of Mines discussing extraction and recovery of different ores from carnotite. Equipment and methods for extraction are presented. This report includes tables, illustrations, and photographs.
Date: November 1915
Creator: Parsons, Charles L.; Moore, R. B.; Lind, S. C. & Schaefer, O. C.
Object Type: Report
System: The UNT Digital Library
Preliminary Report on the Problem of the Atmosphere in Relation to Aeronautics (open access)

Preliminary Report on the Problem of the Atmosphere in Relation to Aeronautics

A report to the Weather Bureau, Washington DC, from the chairman of the Subcommittee on the Atmosphere in Relation to Aeronautics describing the activities accomplished and the proposal of work to be undertaken by the subcommittee.
Date: November 9, 1915
Creator: Marvin, Charles F.
Object Type: Report
System: The UNT Digital Library
Revision of the Pocket Gophers of the Genus Thomomys (open access)

Revision of the Pocket Gophers of the Genus Thomomys

Describes habits, predators, morphology, sexual variation, pelages, and distribution of pocket gophers. Describes genera and group relations. Describes, lists locations and distribution, and provides a key for species and subspecies.
Date: November 15, 1915
Creator: Bailey, Vernon
Object Type: Report
System: The UNT Digital Library
Physical and Chemical Properties of Gasolines Sold Throughout the United States During the Calendar Year 1915 (open access)

Physical and Chemical Properties of Gasolines Sold Throughout the United States During the Calendar Year 1915

Technical paper issued by the Bureau of Mines over the properties of gasoline sold during the year of 1915 in the U.S. The physical and chemical properties of the samples collected are discussed. This paper includes tables, and illustrations.
Date: November 1916
Creator: Rittman, W. F.; Jacobs, W. A. & Dean, E. W.
Object Type: Report
System: The UNT Digital Library
Technology of Salt Making in the United States (open access)

Technology of Salt Making in the United States

Report discussing technology for the production of salt in the United States and also the more important sources of salt in the United States.
Date: November 1917
Creator: Phalen, W. C.
Object Type: Report
System: The UNT Digital Library
Electrolysis and its Mitigation (open access)

Electrolysis and its Mitigation

Technical paper issued by the Bureau of Standards over studies conducted on electrolysis. As stated in the introduction, "this investigation has included a study of the physical laws governing electrolytic and self-corrosion in soils, an extended investigation of the effects of electric currents on plain and reinforced concrete, and a study of the work of previous investigators relating to the subject of electrolysis and its prevention" (p. 5). This paper includes tables, illustrations, and photographs.
Date: November 25, 1918
Creator: Rosa, Edward B. & McCollum, Burton
Object Type: Report
System: The UNT Digital Library
An Apparatus for Measuring the Relative Wear of Sole Leathers, and the Results Obtained with Leather from Different Parts of a Hide (open access)

An Apparatus for Measuring the Relative Wear of Sole Leathers, and the Results Obtained with Leather from Different Parts of a Hide

Technical paper issued by the Bureau of Standards over studies conducted on the quality of sole leather. As stated in the introduction, "the development of a simple method for quickly determining the durability of sole leather seemed desirable, and this paper discusses a laboratory apparatus designed for this purpose and also presents the results of tests made to date to determine the relative wear of leather from different parts of the hide" (p. 3). This paper includes illustrations, and photographs.
Date: November 22, 1919
Creator: Hart, R. W. & Bowker, R. C.
Object Type: Report
System: The UNT Digital Library
Comparison of Alcogas Aviation Fuel With Export Aviation Gasoline (open access)

Comparison of Alcogas Aviation Fuel With Export Aviation Gasoline

Mixtures of gasoline and alcohol when used in internal combustion engines designed for gasoline have been found to possess the advantage of alcohol in withstanding high compression without "knock" while retaining advantages of gasoline with regard to starting characteristics. Test of such fuels for maximum power-producing ability and fuel economy at various rates of consumption are thus of practical importance, with especial reference to high-compression engine development. This report discusses the results of tests which compares the performance of alcogas with x gasoline (export grade) as a standard.
Date: November 25, 1919
Creator: Gage, V. R.; Sparrow, S. W. & Harper, D. R.
Object Type: Report
System: The UNT Digital Library
Analyses of Air from Burning Buildings (open access)

Analyses of Air from Burning Buildings

This report provides results of analyses and pertinent fata regarding eleven samples taken from the composition of the air in burning buildings.
Date: November 1920
Creator: Katz, S. H.
Object Type: Report
System: The UNT Digital Library
Development of the Inflow Theory of the Propeller (open access)

Development of the Inflow Theory of the Propeller

Report discusses the theory of inflow of the propeller and the fact that both suctional axial velocity and suctional tangential velocity must be considered when calculating the maximum efficiency.
Date: November 1920
Creator: Betz, A.
Object Type: Report
System: The UNT Digital Library
Göttingen Wind Tunnel for Testing Aircraft Models (open access)

Göttingen Wind Tunnel for Testing Aircraft Models

Given here is a brief description of the Göttingen wind tunnel for the testing of aircraft models, preceded by a history of its development. Included are a number of diagrams illustrating, among other things, a sectional elevation of the wind tunnel, the pressure regulator, the entrance cone and method of supporting a model for simple drag tests, a three-component balance, and a propeller testing device, all of which are discussed in the text.
Date: November 1920
Creator: Prandtl, L.
Object Type: Report
System: The UNT Digital Library
Horizontal Buoyancy in Wind Tunnels (open access)

Horizontal Buoyancy in Wind Tunnels

Note presenting an examination of horizontal buoyancy in wind tunnels, including an examination of the relative flow, static pressure gradient, horizontal buoyancy computation, and methods of computation in practical use are provided.
Date: November 1920
Creator: Zahm, A. F.
Object Type: Report
System: The UNT Digital Library
Italian and French Experiments on Wind Tunnels (open access)

Italian and French Experiments on Wind Tunnels

Given here are the results of experiments conducted by Colonel Costanzi of the Italian Army to determine the influence of the surrounding building in which a wind tunnel was installed on the efficiency of the installation, and how the efficiency of the installation was affected by the design of the tunnel. Also given are the results of a series of experiments by Eiffel on 34 models of tunnels of different dimensions. This series of experiments was started in order to find out if, by changing the shape of the nozzle or of the diffuser of the large tunnel at Auteuil, the efficiency of the installation could be improved.
Date: November 1920
Creator: Knight, William
Object Type: Report
System: The UNT Digital Library
The Photographic Recording of Small Motions (open access)

The Photographic Recording of Small Motions

Methods and equipment for recording small and sometimes rapid motions by photographic means are described, and the efficacy of photographic recording in such instances is evaluated. The optical system consisting of the light source, the mirror or prism for transmitting motion to the emergent beam, and a means of bringing the rays into focus on the film are discussed. Attention is given to the critical issue of mirror mounting.
Date: November 1920
Creator: Norton, F. H.
Object Type: Report
System: The UNT Digital Library
Recent Developments in Light Alloys (open access)

Recent Developments in Light Alloys

This report is intended to cover the progress that has been made in both the manufacture and utility of light alloys in the United States since the first part of 1919. Duralumin is extensively discussed both as to manufacture and durability.
Date: November 1920
Creator: Woodward, R. W.
Object Type: Report
System: The UNT Digital Library
Tests of Artificial Flight at High Altitudes (open access)

Tests of Artificial Flight at High Altitudes

"If we wish to form an accurate idea of the extraordinary progress achieved in aeronautics, a comparison must be made of the latest altitude records and the figures regarded as highest attainable limit some ten years ago. It is desirable, for two reasons, that we should be able to define the limit of the altitudes that can be reached without artificial aid. First, to know to what extent the human body can endure the inhalation of rarified air. Second, the mental capacity of the aviator must be tested at high altitudes and the limit known below which he is able to make reliable observations without being artificially supplied with oxygen" (p. 1).
Date: November 1920
Creator: Gradenwitz, Arthur
Object Type: Report
System: The UNT Digital Library
Variable Pitch Propellers (open access)

Variable Pitch Propellers

In this report are described four different types of propellers which appeared at widely separated dates, but which were exhibited together at the last Salon de l'Aeronautique. The four propellers are the Chaviere variable pitch propeller, the variable pitch propeller used on the Clement Bayard dirigible, the variable pitch propeller used on Italian dirigibles, and the Levasseur variable pitch propeller.
Date: November 1920
Creator: Bacon, D. L.
Object Type: Report
System: The UNT Digital Library
Aeronautic Instruction in Germany (open access)

Aeronautic Instruction in Germany

This report contains a list of the courses relating to aeronautics announced in Germany, both in the technical high schools and in the universities.
Date: November 1921
Creator: Bouche, Henri
Object Type: Report
System: The UNT Digital Library
The Choice of Wing Sections for Airplanes (open access)

The Choice of Wing Sections for Airplanes

"The subject of the choice of an airfoil section is by no means a closed one, and despite the impossibility of making a single rule serve, it is quite practicable to deduce in a strictly rational manner a series of rules and formulas which are capable of being of the greatest use if we but confine ourselves to the consideration of one element of performance at a time. There are seven such elements of performance which are here taken up in turn. The seven are of different relative importance in different types of airplanes. The seven elements are: maximum speed regardless of minimum; maximum speed for given minimum; maximum speed range ratio; maximum rate of climb; maximum absolute ceiling; maximum distance non-stop; and maximum duration non-stop" (p. 1-2).
Date: November 1921
Creator: Warner, Edward P.
Object Type: Report
System: The UNT Digital Library
The danger of stalled flight and an analysis of the factors which govern it (open access)

The danger of stalled flight and an analysis of the factors which govern it

A definition of "stalled fight" is presented as well as a detailed discussion on the how and why it occurs. Some suggestions are made to prevent its occurrence such as carrying an air speed instrument in the airplane.
Date: November 1921
Creator: Hopf, L.
Object Type: Report
System: The UNT Digital Library
Establishment of Aviation Schools (open access)

Establishment of Aviation Schools

Report presenting a discussion of the creation of a suitable aviation school and some of the characteristics that should be considered in terms of hiring personnel, creating a curriculum, and obtaining equipment.
Date: November 1921
Creator: Kempe, Erich
Object Type: Report
System: The UNT Digital Library