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Drag or Negative Traction of Geared-Down Supporting Propellers in the Downward Vertical Glide of a Helicopter
Discussed here are computations of drag or negative traction of geared down supporting propellers in the downward vertical glide of a helicopter. By means of Frounde's Theory, the maximum value of the drag of a windmill is calculated. For wooden propellers, the author finds that the difference between the drag and the weight is proportional to the number of blades and is larger for propellers of small diameter; thus it is 25 kg. for a six blade propeller with a diameter of 2 m. 50.
Date:
September 1920
Creator:
Toussaint, A.
Object Type:
Report
System:
The UNT Digital Library
Experience With Geared Propeller Drives for Aviation Engines
An overview is given of experience with geared propeller drives for aviation engines. The development of gear wheels is discussed with emphasis upon bending stresses, compressive stresses, heating, and precision in manufacturing. With respect to the general arrangement of gear drives for airplanes, some principal rules of mechanical engineering that apply with special force are noted.
Date:
September 1920
Creator:
Kutzbach, K.
Object Type:
Report
System:
The UNT Digital Library
The Dynamometer Hub
The construction of the dynamometer hub is illustrated and explained, and its electrical and aviation motor tests, as well as those in free flight, described.
Date:
September 1920
Creator:
Stieber, W.
Object Type:
Report
System:
The UNT Digital Library
Recent Efforts and Experiments in the Construction of Aviation Engines
It became evident during World War I that ever-increasing demands were being placed on the mean power of aircraft engines as a result of the increased on board equipment and the demands of aerial combat. The need was for increased climbing efficiency and climbing speed. The response to these demands has been in terms of lightweight construction and the adaptation of the aircraft engine to the requirements of its use.
Date:
September 1920
Creator:
Schwager, [Otto]
Object Type:
Report
System:
The UNT Digital Library
Block or Follower for Baling-Presses.
Patent for blocks or followers for baling presses that has an improved press block to facilitate the handling of the bagging that the bale is wrapped in so the bale can be held tightly.
Date:
September 7, 1920
Creator:
Becker, Irvine N.
Object Type:
Patent
System:
The Portal to Texas History
Cotton-Boll-Cleaning Machine.
Patent for a more practical and compact cotton boll cleaning or ginning machine.
Date:
September 7, 1920
Creator:
Lokey, Allen T.
Object Type:
Patent
System:
The Portal to Texas History
Better seed corn.
Describes how to grow and store quality seed corn.
Date:
September 1920
Creator:
Hartley, C. P. (Charles Pinckney), 1870-
Object Type:
Book
System:
The UNT Digital Library
Apparatus For Protecting And Preserving Poles And The Like
Patent for add-on device to shield existing electric posts and poles from decay over time and weather damage.
Date:
September 21, 1920
Creator:
Lewis, Thomas E.
Object Type:
Patent
System:
The Portal to Texas History
Band-Saw
Patent for improving band-saws for lumber "which can be inexpensively produced, which will not readily crack or otherwise deteriorate in use" (lines 15-18) by "reinforc[ing] the gullets of the teeth that the tendency for cracks to form at this point will be reduced to a minimum" (lines 33-35).
Date:
September 28, 1920
Creator:
McCormick, Merton H.
Object Type:
Patent
System:
The Portal to Texas History
Banjo.
Patent for facilitating the safe packing, storage, and shipment of banjos and other similar musical instruments, including one illustration.
Date:
September 14, 1920
Creator:
Brown, Norman
Object Type:
Patent
System:
The Portal to Texas History
Wire-stretching Tool.
Patent for "a simple tool, easily manufactured and readily taken apart, which can be conveniently carried by one man, and with which he can stretch wire to the proper tension and readily fasten same, said tool being also adapted to be used in cutting wire and removing staples."
Date:
September 14, 1920
Creator:
Manly, Walter D.
Object Type:
Patent
System:
The Portal to Texas History
Landing Device for Aeroplanes.
Patent for improvements in landing devices for aeroplanes that can be controlled by the aviator and adjusted with the direction of the plane's movement as it lands.
Date:
September 7, 1920
Creator:
Martin, Ernest L.
Object Type:
Patent
System:
The Portal to Texas History
Liquid Storage and Dispensing Apparatus.
Patent for an economically efficient liquid storage and dispensing apparatuses. The device is aimed at providing an air pressurized system to discharge inflammable liquids.
Date:
September 14, 1920
Creator:
Carton, John J.
Object Type:
Patent
System:
The Portal to Texas History
Water-Heater
Patent for a water heater that will heat a large quantity of water in a short amount of time. Cool water is delivered to the bottom of the tank, displacing hot water at the top so the tank is always filled with hot water.
Date:
September 14, 1920
Creator:
Faust, Louis F.
Object Type:
Patent
System:
The Portal to Texas History
Biennial Report of the Texas State Library: 1918-1920
Biennial report of the Texas State Library for the years 1918-1920, including the budget and summaries of the library's activities.
Date:
September 1, 1920
Creator:
Texas State Library
Object Type:
Report
System:
The Portal to Texas History
Wire-Stretcher.
Patent for a wire stretcher which includes attachments for pulling the ends of a broken strand of wire together so that it can be repaired, in addition to the usual function of stretching wire thereby taking up slack in unbroken wire strands when erecting fences. The device also "requires a minimum amount of labor in its operation and in which the force employed is exerted in the direction of the line of the wire" (lines 20-23).
Date:
September 14, 1920
Creator:
Stephens, William B.
Object Type:
Patent
System:
The Portal to Texas History
Vehicle-Wheel
Patent for a tire with strong durability and efficient manufacturing.
Date:
September 21, 1920
Creator:
Allan, William N.
Object Type:
Patent
System:
The Portal to Texas History
Standing Valve
Patent for a Standing Valve. This standing valve is designed to improve the way the fluids pump through oil and water wells. it also includes an improvement in the way the standing valve is secured to the wells. The new valve can also be easily replaced because of the materials it is composed of.
Date:
September 21, 1920
Creator:
Adams, Thomas M.
Object Type:
Patent
System:
The Portal to Texas History
Universal Lock and Latch.
Patent for an improved lock and latch system that can be utilized on either the left or right side of a door. The improved design is constructed using the minimum number of materials while remaining durable.
Date:
September 14, 1920
Creator:
Schultze, August J.
Object Type:
Patent
System:
The Portal to Texas History
Surface-Treating Device.
Patent for surface treating devices that provides "a continuously moving surface treating member and support the same in such a manner that its application to the work may be adjusted to a minute degree and controlled by the operator while the device is in operation." (lines 11-16)
Date:
September 14, 1920
Creator:
Clarke, Alex A.
Object Type:
Patent
System:
The Portal to Texas History
Underreamer for Reaming Out Producing-sands.
Patent for "underreaming tools or bits which can be adjusted from the top of the well and which can be set at the required angle..."
Date:
September 21, 1920
Creator:
Lambeth, Acey L.
Object Type:
Patent
System:
The Portal to Texas History
Sunken-Ship Indicator.
Patent for an object that can show the location a sunken boat from the surface of the water and can be carried in or by a boat and becomes operable once the boat sinks.
Date:
September 7, 1920
Creator:
Hlavaty, Joe, Jr.
Object Type:
Patent
System:
The Portal to Texas History
Surface-Treating Machine.
Patent for surface-treating machines in "an anular form and to dispose within the same a complete driving and operating unit, whereby the member is revolved, and to associate with said member and unit a support where by the surface-treating member is carried and may be applied to the work under full control of the operator." (lines 12-19)
Date:
September 14, 1920
Creator:
Clarke, Alex A.
Object Type:
Patent
System:
The Portal to Texas History
Street-Traffic Signal
Patent for a street traffic signal that can be operated from either the center of the intersection, or the curb.
Date:
September 28, 1920
Creator:
Miller, Thomas O.
Object Type:
Patent
System:
The Portal to Texas History